diff --git a/package.json b/package.json
index b002fdd..6ab37bd 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "build": "rimraf ./dist/ && node build.js",
     "test:test": "jest",
-    "test": "node pull_request.js"
+    "test": "node pr_check_gql.js"
   },
   "repository": {
     "type": "git",
diff --git a/pr_check_gql.js b/pr_check_gql.js
new file mode 100644
index 0000000..c9941a6
--- /dev/null
+++ b/pr_check_gql.js
@@ -0,0 +1,218 @@
+const fs = require('fs-extra');
+const fetch = require('node-fetch');
+const exclude = require('./exclude_in_test.json');
+
+function envvar_undefined(variable_name) {
+    throw new Error(`${variable_name} must be defined`);
+}
+console.log({
+    DEBUG: process.env.DEBUG || false,
+});
+
+const README = 'README.md';
+const GITHUB_GQL_API = 'https://api.github.com/graphql';
+const TOKEN = process.env.GITHUB_TOKEN || envvar_undefined('GITHUB_TOKEN');
+
+const LINKS_OPTIONS = {
+    redirect: 'error',
+    headers: {
+        'Content-Type': 'application/json',
+        'user-agent':
+            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36',
+    },
+};
+
+const Authorization = `token ${TOKEN}`;
+
+const make_GQL_options = query => ({
+    method: 'POST',
+    headers: {
+        Authorization,
+        'Content-Type': 'application/json',
+        'user-agent':
+            'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36',
+    },
+    body: JSON.stringify({ query }),
+});
+
+const LOG = {
+    error: (...args) => console.error('❌ ERROR', args),
+    error_string: (...args) =>
+        console.error('❌ ERROR', JSON.stringify({ ...args }, null, '  ')),
+    debug: (...args) => {
+        if (process.env.DEBUG) console.log('>>> DEBUG: ', { ...args });
+    },
+    debug_string: (...args) => {
+        if (process.env.DEBUG)
+            console.log('>>> DEBUG: ', JSON.stringify({ ...args }, null, '  '));
+    },
+};
+
+const handleFailure = error => {
+    console.error(`${error.message}: ${error.stack}`, { error });
+    process.exit(1);
+};
+
+process.on('unhandledRejection', handleFailure);
+
+const extract_all_links = markdown => {
+    // if you have a problem and you try to solve it with a regex,
+    // now you have two problems
+    // TODO: replace this mess with a mardown parser ?
+    const re = /(((https:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Za-z0-9.-]+|(?:www\.|[-;:&=+$,\w]+@)[A-Za-z0-9.-]+)((?:\/[+~%/.\w\-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[.!/@\-\\\w]*))?)/g;
+    return markdown.match(re);
+};
+
+const find_duplicates = arr => {
+    const hm = {};
+    const dup = [];
+    arr.forEach(e => {
+        if (hm[e]) dup.push(e);
+        else hm[e] = true;
+    });
+    return dup;
+};
+
+const partition = (arr, func) => {
+    const ap = [[], []];
+    arr.forEach(e => (func(e) ? ap[0].push(e) : ap[1].push(e)));
+    return ap;
+};
+
+async function fetch_link(url) {
+    try {
+        const { ok, statusText, redirected } = await fetch(url, LINKS_OPTIONS);
+        return [url, { ok, status: statusText, redirected }];
+    } catch (error) {
+        return [url, { ok: false, status: error.message }];
+    }
+}
+
+async function batch_fetch({ arr, get, post_filter_func, BATCH_SIZE = 8 }) {
+    const result = [];
+    /* eslint-disable no-await-in-loop */
+    for (let i = 0; i < arr.length; i += BATCH_SIZE) {
+        const batch = arr.slice(i, i + BATCH_SIZE);
+        LOG.debug_string({ batch });
+        let res = await Promise.all(batch.map(get));
+        console.log(`batch fetched...${i + BATCH_SIZE}`);
+        res = post_filter_func ? res.filter(post_filter_func) : res;
+        LOG.debug_string({ res });
+        result.push(...res);
+    }
+    return result;
+}
+
+const extract_repos = arr =>
+    arr
+        .map(e => e.substr('https://github.com/'.length).split('/'))
+        .filter(r => r.length === 2 && r[1] !== '');
+
+const generate_GQL_query = arr =>
+    `query AWESOME_REPOS{ ${arr
+        .map(
+            ([owner, name]) =>
+                `repo_${owner.replace(/(-|\.)/g, '_')}_${name.replace(
+                    /(-|\.)/g,
+                    '_',
+                )}: repository(owner: "${owner}", name:"${name}"){ nameWithOwner } `,
+        )
+        .join('')} }`;
+
+// =============================================================
+// const batch_github_repos = async (github_links) => {
+//   const BATCH_SIZE = 50;
+//   const repos = extract_repos(github_links);
+//   for (let i = 0; i < repos.length; i += BATCH_SIZE) {
+//     const batch = repos.slice(i, i + BATCH_SIZE);
+//     const query = generate_GQL_query(batch);
+//     LOG.debug({ query });
+//     const gql_response = await fetch(
+//       'https://api.github.com/graphql',
+//       make_GQL_options(query),
+//     ).then((r) => r.json());
+//     LOG.debug({ gql_response });
+//   }
+// };
+// =============================================================
+
+const exclude_length = exclude.length;
+const exclude_from_list = link => {
+    let is_excluded = false;
+    for (let i = 0; i < exclude_length; i += 1) {
+        if (link.startsWith(exclude[i])) {
+            is_excluded = true;
+            break;
+        }
+    }
+    return is_excluded;
+};
+
+async function main() {
+    const has_error = {
+        show: false,
+        duplicates: '',
+        other_links_error: '',
+        github_repos: '',
+    };
+    const markdown = await fs.readFile(README, 'utf8');
+    let links = extract_all_links(markdown);
+    links = links.filter(l => !exclude_from_list(l)); // exclude websites
+    LOG.debug_string({ links });
+
+    console.log(`total links to check ${links.length}`);
+
+    console.log('checking for duplicates links...');
+
+    const duplicates = find_duplicates(links);
+    if (duplicates.length > 0) {
+        has_error.show = true;
+        has_error.duplicates = duplicates;
+    }
+    LOG.debug_string({ duplicates });
+    const [github_links, external_links] = partition(links, link =>
+        link.startsWith('https://github.com'),
+    );
+
+    console.log(`checking ${external_links.length} external links...`);
+
+    const external_links_error = await batch_fetch({
+        arr: external_links,
+        get: fetch_link,
+        post_filter_func: x => !x[1].ok,
+        BATCH_SIZE: 8,
+    });
+    if (external_links_error.length > 0) {
+        has_error.show = true;
+        has_error.other_links_error = external_links_error;
+    }
+
+    console.log(`checking ${github_links.length} GitHub repositories...`);
+
+    const repos = extract_repos(github_links);
+    const query = generate_GQL_query(repos);
+    const options = make_GQL_options(query);
+    LOG.debug_string(query);
+    const gql_response = await fetch(GITHUB_GQL_API, options)
+        .then(r => r.json())
+        .catch(err => console.error({ err }));
+    LOG.debug(gql_response);
+    if (gql_response.errors) {
+        has_error.show = true;
+        has_error.github_repos = gql_response.errors;
+    }
+
+    console.log({
+        TEST_PASSED: !has_error.show,
+        GITHUB_REPOSITORY: github_links.length,
+        EXTERNAL_LINKS: external_links.length,
+    });
+
+    if (has_error.show) {
+        LOG.error_string(has_error);
+        process.exit(1);
+    }
+}
+
+console.log('starting...');
+main();