diff --git a/README.md b/README.md
index b3e213c..e182712 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ As usual in Hubot, you can add all config as environment variables.
 | `KREDITS_WALLET_PATH` | Path to an Etherum wallet JSON file (default: `./wallet.json`) |
 | `KREDITS_WALLET_PASSWORD` | Wallet password |
 | `KREDITS_PROVIDER_URL` | Ethereum JSON-RPC URL (default: `http://localhost:7545`) |
+| `KREDITS_WEB_URL` | URL of the Kredits Web app (default: `https://kredits.kosmos.org`) |
 
 ## Integrations
 
diff --git a/integrations/github.js b/integrations/github.js
index b57a08f..18a78d9 100644
--- a/integrations/github.js
+++ b/integrations/github.js
@@ -1,5 +1,6 @@
 const util = require('util');
 const fetch = require('node-fetch');
+const session = require('express-session');
 const grant = require('grant-express');
 const amountFromLabels = require('./utils/amount-from-labels');
 const kindFromLabels = require('./utils/kind-from-labels');
@@ -174,22 +175,45 @@ module.exports = async function(robot, kredits) {
   });
 
 
-
   if (process.env.GITHUB_KEY && process.env.GITHUB_SECRET) {
     const grantConfig = {
       defaults: {
         protocol: (process.env.GRANT_PROTOCOL || "http"),
-        host: (process.env.GRANT_HOST || 'localhost:3000')
+        host: (process.env.GRANT_HOST || 'localhost:8888'),
+        transport: 'session',
+        response: 'tokens',
+        path: '/kredits/signup'
       },
       github: {
         key: process.env.GITHUB_KEY,
         secret: process.env.GITHUB_SECRET,
         scope: ['user', 'public_repo'],
-        callback: 'https://kredits.kosmos.org/signup/github'
+        callback: '/kredits/signup/github'
       }
     };
 
-    robot.router.use('/kredits/signup/github/', grant(grantConfig));
+    const allowCORS = function (req, res, next) {
+      res.setHeader('Access-Control-Allow-Origin', '*');
+      res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+      res.setHeader('Access-Control-Allow-Headers', 'Origin, Content-Type, Accept');
+      res.setHeader('Access-Control-Expose-Headers', 'ETag, Content-Length');
+      next();
+    };
+    robot.router.use(allowCORS);
+
+    robot.router.use(session({secret: 'grant'}));
+    robot.router.use('/kredits/signup', grant(grantConfig));
+
+    robot.router.get('/kredits/signup/github', async (req, res) => {
+      const access_token = req.session.grant.response.access_token;
+      const kreditsWebUrl = process.env.KREDITS_WEB_URL || 'https://kredits.kosmos.org';
+
+      res.redirect(`${kreditsWebUrl}/signup/github#access_token=${access_token}`);
+    });
+
+    robot.router.options('/kredits/signup/github', async (req, res) => {
+      res.status(200).json({});
+    });
 
     robot.router.post('/kredits/signup/github', async (req, res) => {
       const accessToken = req.body.accessToken;
@@ -226,6 +250,7 @@ module.exports = async function(robot, kredits) {
         kredits.Contributor.add(contributorAttr)
           .then(transaction => {
             robot.logger.info('Contributor added', transaction.hash);
+            res.status(201);
             res.json({
               transactionHash: transaction.hash,
               github_username: user.login
diff --git a/package-lock.json b/package-lock.json
index 22edbe0..5881404 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,15 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.4.tgz",
       "integrity": "sha512-DT25xX/YgyPKiHFOpNuANIQIVvYEwCWXgK2jYYwqgaMrYE6+tq+DtmMwlD3drl6DJbUwtlIDnn0d7tIn/EbXBg=="
     },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
     "aes-js": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz",
@@ -34,6 +43,11 @@
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ="
     },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
     "asmcrypto.js": {
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/asmcrypto.js/-/asmcrypto.js-2.3.2.tgz",
@@ -319,6 +333,33 @@
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
       "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
     },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        }
+      }
+    },
     "borc": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/borc/-/borc-2.1.0.tgz",
@@ -395,6 +436,11 @@
       "resolved": "https://registry.npmjs.org/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz",
       "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug="
     },
+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
+    },
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -475,11 +521,41 @@
         }
       }
     },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
     "convert-source-map": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.5.0.tgz",
       "integrity": "sha1-ms1whRxtXf3ZPZKC5e35SgP/RrU="
     },
+    "cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg=="
+    },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    },
     "cookiejar": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
@@ -543,6 +619,16 @@
       "resolved": "https://registry.npmjs.org/delimit-stream/-/delimit-stream-0.1.0.tgz",
       "integrity": "sha1-m4MZR3wOX4rrPONXrjBfwl6hzSs="
     },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
     "detect-indent": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-4.0.0.tgz",
@@ -566,6 +652,11 @@
         "create-hmac": "^1.1.4"
       }
     },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
+    },
     "elliptic": {
       "version": "6.4.1",
       "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.1.tgz",
@@ -580,6 +671,11 @@
         "minimalistic-crypto-utils": "^1.0.0"
       }
     },
+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
+    },
     "end-of-stream": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
@@ -593,11 +689,21 @@
       "resolved": "https://registry.npmjs.org/err-code/-/err-code-1.1.2.tgz",
       "integrity": "sha1-BuARbTAo9q70gGhJ6w6mp0iuaWA="
     },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
+    },
     "eth-provider": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/eth-provider/-/eth-provider-0.2.2.tgz",
@@ -671,6 +777,98 @@
         "safe-buffer": "^5.1.1"
       }
     },
+    "express": {
+      "version": "4.17.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.17.1.tgz",
+      "integrity": "sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==",
+      "requires": {
+        "accepts": "~1.3.7",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.19.0",
+        "content-disposition": "0.5.3",
+        "content-type": "~1.0.4",
+        "cookie": "0.4.0",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "~1.1.2",
+        "fresh": "0.5.2",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.5",
+        "qs": "6.7.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.1.2",
+        "send": "0.17.1",
+        "serve-static": "1.14.1",
+        "setprototypeof": "1.1.1",
+        "statuses": "~1.5.0",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
+    "express-session": {
+      "version": "1.16.2",
+      "resolved": "https://registry.npmjs.org/express-session/-/express-session-1.16.2.tgz",
+      "integrity": "sha512-oy0sRsdw6n93E9wpCNWKRnSsxYnSDX9Dnr9mhZgqUEEorzcq5nshGYSZ4ZReHFhKQ80WI5iVUUSPW7u3GaKauw==",
+      "requires": {
+        "cookie": "0.3.1",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "~2.0.0",
+        "on-headers": "~1.0.2",
+        "parseurl": "~1.3.3",
+        "safe-buffer": "5.1.2",
+        "uid-safe": "~2.1.5"
+      },
+      "dependencies": {
+        "cookie": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
+          "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
+        },
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
     "extend-shallow": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
@@ -689,6 +887,30 @@
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
       "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="
     },
+    "finalhandler": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
+      "integrity": "sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==",
+      "requires": {
+        "debug": "2.6.9",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "statuses": "~1.5.0",
+        "unpipe": "~1.0.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        }
+      }
+    },
     "flatmap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/flatmap/-/flatmap-0.0.3.tgz",
@@ -707,6 +929,16 @@
         "for-in": "^1.0.1"
       }
     },
+    "forwarded": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
+      "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
+    },
+    "fresh": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
+      "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
+    },
     "fs-constants": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
@@ -740,6 +972,24 @@
       "resolved": "https://registry.npmjs.org/globals/-/globals-9.18.0.tgz",
       "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ=="
     },
+    "grant": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/grant/-/grant-4.6.1.tgz",
+      "integrity": "sha512-21ZsJ+z/CAag9JsciF8yfhqLtHImIv8wf5ii1E6e9uyEG/Qu9wIuWFljj9EFQkgQRjWSJQLERTq5EIkgnXtTow==",
+      "requires": {
+        "qs": "^6.7.0",
+        "request-compose": "^1.2.0",
+        "request-oauth": "0.0.3"
+      }
+    },
+    "grant-express": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/grant-express/-/grant-express-4.6.1.tgz",
+      "integrity": "sha512-N7mHKxSmlB4f8pDchR2U4FYKpbbPplEOdE6F4Zq90Lealb3tESyHydFJ1zS7eG2K9GERCwcmxJVwwHDF4h0cGg==",
+      "requires": {
+        "grant": "4.6.1"
+      }
+    },
     "group-array": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/group-array/-/group-array-0.3.3.tgz",
@@ -798,6 +1048,18 @@
         "os-tmpdir": "^1.0.1"
       }
     },
+    "http-errors": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
+      "integrity": "sha512-uUQBt3H/cSIVfch6i1EuPNy/YsRSOUBXTVfZ+yR7Zjez3qjBz6i9+i4zjNaoqcoFVI4lQJ5plg63TvGfRSDCRg==",
+      "requires": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.3",
+        "setprototypeof": "1.1.1",
+        "statuses": ">= 1.5.0 < 2",
+        "toidentifier": "1.0.0"
+      }
+    },
     "http-https": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/http-https/-/http-https-1.0.0.tgz",
@@ -808,6 +1070,14 @@
       "resolved": "https://registry.npmjs.org/i/-/i-0.3.5.tgz",
       "integrity": "sha1-HSuFQVjsgWkRPGy39raAHpniEdU="
     },
+    "iconv-lite": {
+      "version": "0.4.24",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+      "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+      "requires": {
+        "safer-buffer": ">= 2.1.2 < 3"
+      }
+    },
     "ieee754": {
       "version": "1.1.13",
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
@@ -845,6 +1115,11 @@
       "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-2.1.0.tgz",
       "integrity": "sha1-+ni/XS5pE8kRzp+BnuUUa7bYROk="
     },
+    "ipaddr.js": {
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.0.tgz",
+      "integrity": "sha512-M4Sjn6N/+O6/IXSJseKqHoFc+5FdGJ22sXqnjTpdZweHK64MzEPAyQZyEU3R/KRv2GLoa7nNtg/C2Ev6m7z+eA=="
+    },
     "ipfs-block": {
       "version": "0.8.0",
       "resolved": "https://registry.npmjs.org/ipfs-block/-/ipfs-block-0.8.0.tgz",
@@ -865,7 +1140,7 @@
         "bs58": "^4.0.1",
         "buffer": "^5.2.1",
         "cids": "~0.5.5",
-        "concat-stream": "github:hugomrdias/concat-stream#feat/smaller",
+        "concat-stream": "github:hugomrdias/concat-stream#057bc7b5d6d8df26c8cf00a3f151b6721a0a8034",
         "debug": "^4.1.0",
         "detect-node": "^2.0.4",
         "end-of-stream": "^1.4.1",
@@ -887,7 +1162,7 @@
         "multibase": "~0.6.0",
         "multicodec": "~0.5.0",
         "multihashes": "~0.4.14",
-        "ndjson": "github:hugomrdias/ndjson#feat/readable-stream3",
+        "ndjson": "github:hugomrdias/ndjson#4db16da6b42e5b39bf300c3a7cde62abb3fa3a11",
         "once": "^1.4.0",
         "peer-id": "~0.12.2",
         "peer-info": "~0.15.1",
@@ -1289,6 +1564,39 @@
         }
       }
     },
+    "media-typer": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
+    },
+    "merge-descriptors": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
+      "integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E="
+    },
+    "methods": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
+      "integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4="
+    },
+    "mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg=="
+    },
+    "mime-db": {
+      "version": "1.40.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.40.0.tgz",
+      "integrity": "sha512-jYdeOMPy9vnxEqFRRo6ZvTZ8d9oPb+k18PKoYNYUe2stVEBPPwsln/qWzdbmaIvnhZ9v2P+CuecK+fpUfsV2mA=="
+    },
+    "mime-types": {
+      "version": "2.1.24",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.24.tgz",
+      "integrity": "sha512-WaFHS3MCl5fapm3oLxU4eYDw77IQM2ACcxQ9RIxfaC3ooc6PFuBMGZZsYpvoXS5D5QTWPieo1jjLdAm3TBP3cQ==",
+      "requires": {
+        "mime-db": "1.40.0"
+      }
+    },
     "minimalistic-assert": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.0.tgz",
@@ -1431,6 +1739,11 @@
         }
       }
     },
+    "negotiator": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
+      "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
+    },
     "node-cron": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/node-cron/-/node-cron-2.0.3.tgz",
@@ -1464,6 +1777,11 @@
       "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
       "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
     },
+    "oauth-sign": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
+      "integrity": "sha1-Rqarfwrq2N6unsBWV4C31O/rnUM="
+    },
     "object-assign": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-2.1.1.tgz",
@@ -1477,6 +1795,19 @@
         "http-https": "^1.0.0"
       }
     },
+    "on-finished": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
+      "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
+      "requires": {
+        "ee-first": "1.1.1"
+      }
+    },
+    "on-headers": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz",
+      "integrity": "sha512-pZAE+FJLoyITytdqK0U5s+FIpjN0JP3OzFi/u8Rx+EV5/W+JTWGXG8xFzevE7AjBfDqHv/8vL8qQsIhHnqRkrA=="
+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -1508,11 +1839,21 @@
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
       "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ="
     },
+    "parseurl": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
+      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ=="
+    },
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
+    "path-to-regexp": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
+      "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
+    },
     "peer-id": {
       "version": "0.12.2",
       "resolved": "https://registry.npmjs.org/peer-id/-/peer-id-0.12.2.tgz",
@@ -1600,6 +1941,15 @@
         "varint": "^5.0.0"
       }
     },
+    "proxy-addr": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.5.tgz",
+      "integrity": "sha512-t/7RxHXPH6cJtP0pRG6smSr9QJidhB+3kXu0KgXnbGYMgzEnUxRQ4/LDdfOwZEMyIh3/xHb8PX3t+lfL9z+YVQ==",
+      "requires": {
+        "forwarded": "~0.1.2",
+        "ipaddr.js": "1.9.0"
+      }
+    },
     "pull-defer": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/pull-defer/-/pull-defer-0.2.3.tgz",
@@ -1657,6 +2007,27 @@
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
       "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ=="
     },
+    "random-bytes": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/random-bytes/-/random-bytes-1.0.0.tgz",
+      "integrity": "sha1-T2ih3Arli9P7lYSMMDJNt11kNgs="
+    },
+    "range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg=="
+    },
+    "raw-body": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.4.0.tgz",
+      "integrity": "sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==",
+      "requires": {
+        "bytes": "3.1.0",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
+      }
+    },
     "read": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/read/-/read-1.0.7.tgz",
@@ -1692,6 +2063,28 @@
         "is-finite": "^1.0.0"
       }
     },
+    "request-compose": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/request-compose/-/request-compose-1.2.0.tgz",
+      "integrity": "sha512-kvWsOZhYsoIJw6cLQHgcENHktD/dozkjvTFi30+OwAoaXcnTS0dGD1Pp2Auq3Kf54wVP7Sf4hUJCkzySKMe/vA=="
+    },
+    "request-oauth": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/request-oauth/-/request-oauth-0.0.3.tgz",
+      "integrity": "sha512-q7WdJlpIcPaIDac0FZSy/yH37FO3UkUuPDIsiLALiLjuC6vzvuKIU14YIC3Lm0wtQRXS9GqvSo/fCYj8n75xSw==",
+      "requires": {
+        "oauth-sign": "^0.8.2",
+        "qs": "^6.5.1",
+        "uuid": "^3.2.1"
+      },
+      "dependencies": {
+        "uuid": {
+          "version": "3.3.2",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+          "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
+        }
+      }
+    },
     "revalidator": {
       "version": "0.1.8",
       "resolved": "https://registry.npmjs.org/revalidator/-/revalidator-0.1.8.tgz",
@@ -1736,6 +2129,11 @@
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
       "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
     },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
     "scrypt-js": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-2.0.4.tgz",
@@ -1756,6 +2154,59 @@
         "safe-buffer": "^5.1.0"
       }
     },
+    "send": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
+      "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "destroy": "~1.0.4",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "~1.7.2",
+        "mime": "1.6.0",
+        "ms": "2.1.1",
+        "on-finished": "~2.3.0",
+        "range-parser": "~1.2.1",
+        "statuses": "~1.5.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          },
+          "dependencies": {
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+            }
+          }
+        },
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
+        }
+      }
+    },
+    "serve-static": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
+      "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
+      "requires": {
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "0.17.1"
+      }
+    },
     "set-value": {
       "version": "0.4.3",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
@@ -1772,6 +2223,11 @@
       "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.4.tgz",
       "integrity": "sha1-IOgd5iLUoCWIzgyNqJc8vPHTE48="
     },
+    "setprototypeof": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
+      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
+    },
     "sha.js": {
       "version": "2.4.11",
       "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
@@ -1855,6 +2311,11 @@
       "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.10.tgz",
       "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA="
     },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
+    },
     "stream-to-pull-stream": {
       "version": "1.7.3",
       "resolved": "https://registry.npmjs.org/stream-to-pull-stream/-/stream-to-pull-stream-1.7.3.tgz",
@@ -1939,6 +2400,11 @@
         "kind-of": "^3.0.2"
       }
     },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
+    },
     "traverse": {
       "version": "0.6.6",
       "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
@@ -1959,11 +2425,28 @@
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-1.0.1.tgz",
       "integrity": "sha512-kcoMoKTPYnoeS50tzoqjPY3Uv9axeuuFAZY9M/9zFnhoVvRfxz9K29IMPD7jGmt2c8SW7i3gT9WqDl2+nV7p4A=="
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "tz-offset": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/tz-offset/-/tz-offset-0.0.1.tgz",
       "integrity": "sha512-kMBmblijHJXyOpKzgDhKx9INYU4u4E1RPMB0HqmKSgWG8vEcf3exEfLh4FFfzd3xdQOw9EuIy/cP0akY6rHopQ=="
     },
+    "uid-safe": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/uid-safe/-/uid-safe-2.1.5.tgz",
+      "integrity": "sha512-KPHm4VL5dDXKz01UuEd88Df+KzynaohSL9fBh096KWAxSKZQDI2uBrVqtvRM4rwrIrRRKsdLNML/lnaaVSRioA==",
+      "requires": {
+        "random-bytes": "~1.0.0"
+      }
+    },
     "union-value": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-0.2.4.tgz",
@@ -1980,6 +2463,11 @@
       "resolved": "https://registry.npmjs.org/unique-by/-/unique-by-1.0.0.tgz",
       "integrity": "sha1-UiDIa6e8Vy+3E610ZRRwy2RCEr0="
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
+    },
     "ursa-optional": {
       "version": "0.9.10",
       "resolved": "https://registry.npmjs.org/ursa-optional/-/ursa-optional-0.9.10.tgz",
@@ -2014,6 +2502,11 @@
         }
       }
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+    },
     "uuid": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.1.tgz",
@@ -2024,6 +2517,11 @@
       "resolved": "https://registry.npmjs.org/varint/-/varint-5.0.0.tgz",
       "integrity": "sha1-2Ca4n3SQcy+rwMDtaT7Uddyynr8="
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
     "winston": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/winston/-/winston-2.1.1.tgz",
diff --git a/package.json b/package.json
index 15a39bf..71fcc61 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,9 @@
   "dependencies": {
     "eth-provider": "^0.2.2",
     "ethers": "^4.0.27",
+    "express": "^4.17.1",
+    "express-session": "^1.16.2",
+    "grant-express": "^4.6.1",
     "group-array": "^0.3.3",
     "kosmos-schemas": "^1.1.2",
     "kredits-contracts": "^5.3.0",