diff --git a/README.md b/README.md
index b3e213c..9a7026d 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,9 @@ 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`) |
+| `KREDITS_DAO_ADDRESS` | DAO Kernel address |
+| `SESSION_SECRET` | Secret used to sign the Session ID |
 
 ## Integrations
 
diff --git a/integrations/github.js b/integrations/github.js
index 8fa85dc..b0b9191 100644
--- a/integrations/github.js
+++ b/integrations/github.js
@@ -1,5 +1,8 @@
 const util = require('util');
 const fetch = require('node-fetch');
+const session = require('express-session');
+const grant = require('grant-express');
+const cors = require('cors');
 const amountFromLabels = require('./utils/amount-from-labels');
 const kindFromLabels = require('./utils/kind-from-labels');
 
@@ -21,6 +24,8 @@ module.exports = async function(robot, kredits) {
     robot.logger.debug('[hubot-kredits] Ignoring GitHub actions from ', util.inspect(repoBlackList));
   }
 
+  const kreditsWebUrl = process.env.KREDITS_WEB_URL || 'https://kredits.kosmos.org';
+
   const Contributor = kredits.Contributor;
   const Contribution = kredits.Contribution;
 
@@ -172,4 +177,95 @@ module.exports = async function(robot, kredits) {
     }
   });
 
+  //
+  // GitHub signup
+  //
+
+  if (process.env.GITHUB_KEY && process.env.GITHUB_SECRET) {
+    const grantConfig = {
+      defaults: {
+        protocol: (process.env.GRANT_PROTOCOL || "http"),
+        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,
+        callback: '/kredits/signup/github'
+      }
+    };
+
+    robot.router.use(session({ secret: process.env.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;
+
+      res.redirect(`${kreditsWebUrl}/signup/github#access_token=${access_token}`);
+    });
+
+    robot.router.options('/kredits/signup/github', cors());
+
+    robot.router.post('/kredits/signup/github', cors(), async (req, res) => {
+      const accessToken = req.body.accessToken;
+      if (!accessToken) {
+        res.status(400).json({});
+        return;
+      }
+      try {
+        const githubResponse = await fetch('https://api.github.com/user', {
+          headers: {
+            'Accept': 'application/vnd.github.v3+json',
+            'Authorization': `token ${accessToken}`
+          }
+        });
+      } catch (error) {
+        robot.logger.error('[hubot-kredits] Fetching user data from GitHub failed:', error);
+        res.status(500).json({ error });
+      };
+
+      if (githubResponse.status >= 300) {
+        res.status(githubResponse.status).json({});
+        return;
+      }
+      const user = await githubResponse.json();
+
+      const contributor = await kredits.Contributor.findByAccount({
+        site: 'github.com',
+        username: user.login
+      });
+
+      if (!contributor) {
+        let contributorAttr = {};
+        contributorAttr.account = req.body.account;
+        contributorAttr.name = user.name || user.login;
+        contributorAttr.kind = "person";
+        contributorAttr.url = user.blog;
+        contributorAttr.github_username = user.login;
+        contributorAttr.github_uid = user.id;
+
+        kredits.Contributor.add(contributorAttr, { gasLimit: 350000 })
+          .then(transaction => {
+            robot.logger.info('[hubot-kredits] Contributor added from GitHub signup', transaction.hash);
+            res.status(201);
+            res.json({
+              transactionHash: transaction.hash,
+              github_username: user.login
+            });
+          }, error => {
+            robot.logger.error(`[hubot-kredits] Adding contributor failed: ${error}`);
+            res.status(422);
+            res.json({ error })
+          });
+      } else {
+        res.json({
+          github_username: user.login
+        });
+      }
+    });
+  } else {
+    robot.logger.warning('[hubot-kredits] No GITHUB_KEY and GITHUB_SECRET configured for OAuth signup');
+  }
 };
diff --git a/package-lock.json b/package-lock.json
index 3057e27..0b085af 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",
@@ -29,10 +38,10 @@
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg=="
     },
-    "arr-union": {
-      "version": "3.1.0",
-      "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",
@@ -40,9 +49,9 @@
       "integrity": "sha512-3FgFARf7RupsZETQ1nHnhLUUvpcttcCq1iZCaVAbJZbCZ5VNRrNyvpDyHTOb0KC3llFcsyOT/a99NZcCbeiEsA=="
     },
     "asn1.js": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.0.1.tgz",
-      "integrity": "sha512-aO8EaEgbgqq77IEw+1jfx5c9zTbzvkfuRBuZsSsPnTHMkmd5AI4J6OtITLZFa381jReeaQL67J0GBTUu0+ZTVw==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.2.0.tgz",
+      "integrity": "sha512-Q7hnYGGNYbcmGrCPulXfkEw7oW7qjWeM4ZTALmgpuIcZLxyqqKYWxCZg2UBm8bklrnB4m2mGyJPWfoktdORD8A==",
       "requires": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
@@ -50,18 +59,11 @@
       }
     },
     "async": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.2.tgz",
-      "integrity": "sha512-H1qVYh1MYhEEFLsP97cVKqCGo7KfCyTt6uEWqsTBr9SO84oK9Uwbyd/yCW+6rKJLHksBNUVWZDAjfS+Ccx0Bbg==",
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
       "requires": {
-        "lodash": "^4.17.11"
-      },
-      "dependencies": {
-        "lodash": {
-          "version": "4.17.11",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
-        }
+        "lodash": "^4.17.14"
       }
     },
     "async-limiter": {
@@ -248,17 +250,17 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base-x": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.5.tgz",
-      "integrity": "sha512-C3picSgzPSLE+jW3tcBzJoGwitOtazb5B+5YmAxZm2ybmTi9LNgAtDO/jjVEBZwHoXmDBZ9m/IELj3elJVRBcA==",
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.6.tgz",
+      "integrity": "sha512-4PaF8u2+AlViJxRVjurkLTxpp7CaFRD/jo5rPT9ONnKxyhQ8f59yzamEvq7EkriG56yn5On4ONyaG75HLqr46w==",
       "requires": {
         "safe-buffer": "^5.0.1"
       }
     },
     "base64-js": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
-      "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw=="
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.1.tgz",
+      "integrity": "sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g=="
     },
     "bignumber.js": {
       "version": "8.1.1",
@@ -290,21 +292,26 @@
       },
       "dependencies": {
         "readable-stream": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.3.0.tgz",
-          "integrity": "sha512-EsI+s3k3XsW+fU8fQACLN59ky34AZ14LoeVZpYwmZvldCFo0r0gnelwF2TcMjLor/BTL5aDJVBMkss0dthToPw==",
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
             "util-deprecate": "^1.0.1"
           }
         },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+        },
         "string_decoder": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
-          "integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+          "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
           "requires": {
-            "safe-buffer": "~5.1.0"
+            "safe-buffer": "~5.2.0"
           }
         }
       }
@@ -319,16 +326,50 @@
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
       "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
     },
-    "borc": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/borc/-/borc-2.1.0.tgz",
-      "integrity": "sha512-hKTxeYt3AIzIG45epJHv8xJYSF0ktp7nZgFsqi5cPzoL3T8qKMPeUlqydORy6j3NWZvRDANx30PjpTmGho69Gw==",
+    "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": {
-        "bignumber.js": "^8.0.1",
+        "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": "2.1.1",
+      "resolved": "https://registry.npmjs.org/borc/-/borc-2.1.1.tgz",
+      "integrity": "sha512-vPLLC2/gS0QN4O3cnPh+8jLshkMMD4qIfs+B1TPGPh30WrtcfItaO6j4k9alsqu/hIgKi8dVdmMvTcbq4tIF7A==",
+      "requires": {
+        "bignumber.js": "^9.0.0",
         "commander": "^2.15.0",
         "ieee754": "^1.1.8",
         "iso-url": "~0.4.4",
         "json-text-sequence": "~0.1.0"
+      },
+      "dependencies": {
+        "bignumber.js": {
+          "version": "9.0.0",
+          "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-9.0.0.tgz",
+          "integrity": "sha512-t/OYhhJ2SD+YGBQcjY8GzzDHEk9f3nerxjtfa6tlMXfe7frs/WozhvCNoGvpM0P3bNf3Gq5ZRMlGr5f3r4/N8A=="
+        }
       }
     },
     "brace-expansion": {
@@ -377,9 +418,9 @@
       }
     },
     "buffer": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
-      "integrity": "sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==",
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.4.0.tgz",
+      "integrity": "sha512-Xpgy0IwHK2N01ncykXTy6FpCWuM+CJSHoPVBLyNqyrWxsedpLvwsYUhf0ME3WRFNUhos0dMamz9cOS/xRDtU5g==",
       "requires": {
         "base64-js": "^1.0.2",
         "ieee754": "^1.1.4"
@@ -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",
@@ -456,30 +502,65 @@
       },
       "dependencies": {
         "readable-stream": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.3.0.tgz",
-          "integrity": "sha512-EsI+s3k3XsW+fU8fQACLN59ky34AZ14LoeVZpYwmZvldCFo0r0gnelwF2TcMjLor/BTL5aDJVBMkss0dthToPw==",
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
             "util-deprecate": "^1.0.1"
           }
         },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+        },
         "string_decoder": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
-          "integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+          "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
           "requires": {
-            "safe-buffer": "~5.1.0"
+            "safe-buffer": "~5.2.0"
           }
         }
       }
     },
+    "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",
@@ -495,6 +576,22 @@
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
+    "cors": {
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+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
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@@ -2014,6 +2611,11 @@
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diff --git a/package.json b/package.json
index 369fcd0..e8cb0a0 100644
--- a/package.json
+++ b/package.json
@@ -10,11 +10,15 @@
     "create-wallet": "scripts/create-wallet.js"
   },
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