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, install config and code. Checked Nov 2, 2026.

Tools: 2 read · 0 write · 0 delete · 1 not yet classified
Secrets: None asked for
Install scripts: None found
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

Network hosts it talks to 5

api.boltz.exchange · found in code
captcha.powforge.dev · found in code
github.com · found in code
mempool.space · found in code
powforge.dev · found in code

Files it touches

Your home directory (~)

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 Registry github-graphql

More from zekebuilds-lab

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Chalk Labs is a two-founder AI and growth studio. We build AI agents, CRMs and MVPs for Web3 and AI companies, and have shipped 50+ product and token launches.

launches shipped: 50+; launches shipped
media placements: 500+; media placements
founders on every account: 2; founders on every account

Press we've placed: Forbes · CoinDesk · Decrypt · Cointelegraph · The Block

Rahil Jain, Co-founder, Chalk Labs. Ex-Goldman Sachs engineer. You talk to the person who builds it.

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Cite this page

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