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Captcha MCP

Charge AI agents per-call without accounts.

Connector by zekebuilds-lab · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 1
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Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/zekebuilds-lab-captcha-mcp

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Charge AI agents per-call without accounts. PoW solve = free tier, Lightning = paid tier.

Reviews

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
2 read · 0 write · 0 delete · 1 not yet classified
Secrets
None asked for
Install scripts
Not scanned yet
Runs as
Node.js package

Tools by what they do 3

Read from the source code; the running server may list different tools.

Read 2 · Look things up without changing anything.

  • status
  • verify

Not yet classified 1 · We could not tell from the name and description.

  • challenge

Secrets and settings it asks for

Other settings (environment variables or headers).

  • CAPTCHA_URL

Tools (3)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • challenge

    Request a fresh PoW challenge from the PowForge captcha service. Returns {id, salt, difficulty, signature, instructions}. The agent must find a nonce such that SHA-256(salt + nonce) has at least `difficulty` leading zero bits, then call the verify tool. Free tier — no payment required.

  • status

    Return PowForge captcha server health, lifetime stats (pow_solves, ln_skips, challenges_issued), and L402 endpoint metadata (scope, price_sats, paid endpoint URL). Use this to discover the Lightning skip price before paying, or as a liveness check.

  • verify

    Verify a PoW solution. Input: {salt, nonce, id, signature, algo?, difficulty?} from a prior challenge call plus the nonce the agent computed. Returns a 5-minute HMAC-signed token on success, or {valid: false, reason} on failure. Tokens can be re-verified server-side via POST /api/token/verify.

Signals

Stars
1
Forks
0
Open issues
0
Last commit
Aug 9, 2026 (2 months ago)
Last release
May 10, 2026 (5 months ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
io.github.zekebuilds-lab/captcha-mcp
Version
0.1.1
Auth
No auth
Packages
npm @powforge/captcha-mcp
License
MIT
Repository
github.com/zekebuilds-lab/captcha-mcp
Website
powforge.dev/captcha
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql

More from zekebuilds-lab

Cite this page

Captcha MCP. Agent Mart. https://agentmart.dev/connectors/zekebuilds-lab-captcha-mcp (last updated 2026-10-24)