# Captcha

> Replace MCP 429 errors with PoW challenges or Lightning micropayments. Drop-in rate control for MCP servers — no accounts, free fallback, self-hosted. Three tools: challenge, verify, status. Stdio + HTTP transports, stdlib only.

## Facts
- Page: https://tashan.sh/capability/pkg-powforge-captcha-mcp
- tashan id: pkg:@powforge/captcha-mcp
- Source: https://github.com/zekebuilds-lab/captcha-mcp
- npm: https://www.npmjs.com/package/@powforge/captcha-mcp
- Type: npm
- Category: devtools
- tashan score: 42.0 / 100
- Adoption: 22.0
- Upkeep: 56.0
- Freshness: 79.0
- Evidence coverage: 100% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- npm downloads: 34/week
- Official: no

## Install

```sh
claude mcp add powforge-captcha -- npx -y @powforge/captcha-mcp
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-05 by tashan (https://tashan.sh) from public evidence. Scorer s5.