![\"CaptchaKraken\"](\"https://raw.githubusercontent.com/JWriter20/CaptchaKraken/main/docs/assets/logo-card.png\"){kind=logo}
\n\n \n
\n The CaptchaKraken account, driven from an MCP client.\n
\n\nIt signs you in through GitHub, mints and revokes API keys for the solving\nendpoint, and reads back what you have spent.\n\n**It does not solve captchas.** The key it mints is what does that, against the\nOpenAI-compatible endpoint at `api.captchakraken.com/v1`.\n\n```bash\nclaude mcp add captchakraken -- npx -y captchakraken-mcp\n```\n\n## Tools\n\n| Tool | What it does |\n| --- | --- |\n| `sign_in` | Prints a code and a link; the human approves in a browser. Creates the account if it does not exist, with trial credits and a first key. |\n| `sign_out` | Revokes this client's token on the server and deletes it from disk. |\n| `get_account` | Who is signed in, the balance, and the base URL to point a solver at. |\n| `get_balance` | The balance, and nothing else. |\n| `get_usage` | Billable responses and credits, per day and in total, plus purchases. |\n| `list_api_keys` | The account's solving keys, masked. |\n| `create_api_key` | Mints one and **saves it to disk; the secret is never shown.** |\n| `revoke_api_key` | Kills one by id. Effective within ~30 seconds. |\n| `get_topup_link` | A Stripe URL for the human to open. Charges nothing. |\n| `get_pricing` | The rate card, and how many responses a captcha typically takes. |\n| `get_models` | The lineup, so an agent can decide whether to self-host instead. |\n\n## Signing in\n\nThe MCP server runs on a laptop, inside an editor, with no browser it controls\nand nowhere for an OAuth redirect to land. It also cannot hold our GitHub client\nsecret — it is distributed to customers, so anything baked into it is public.\n\nSo it uses the device flow (RFC 8628):\n\n```\nsign_in ──▶ \"Open http://…/device?code=ABCD-EFGH, code ABCD-EFGH\"\n │\n ├─ the human opens it, signs in with GitHub, approves\n │\nsign_in ──▶ \"Signed in as