# io.github.zekebuilds-lab/captcha-mcp (npm · @powforge/captcha-mcp)

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

- Trust score: 64/100 (medium)
- Change this week: −16
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `@powforge/captcha-mcp`: 64/100 (this document), [markdown](https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp.md), [page](https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp)

## Channel facts

- Registry: `npm`
- Package: `@powforge/captcha-mcp`
- Version: `0.1.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 62 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 299 tokens (~99/item across 3 items; 3 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 20/100
  - Spec-recency check failed: implements MCP spec 2024-11-05; the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### Claude

```bash
claude mcp add zekebuilds-lab-captcha-mcp -- npx -y @powforge/captcha-mcp
```

### Codex

```bash
codex mcp add zekebuilds-lab-captcha-mcp -- npx -y @powforge/captcha-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "zekebuilds-lab-captcha-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@powforge/captcha-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add zekebuilds-lab-captcha-mcp --command npx --arg -y --arg @powforge/captcha-mcp
```

### Hermes

```yaml
mcp_servers:
  zekebuilds-lab-captcha-mcp:
    command: "npx"
    args: ["-y", "@powforge/captcha-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "zekebuilds-lab-captcha-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@powforge/captcha-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 64, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-07-31 (score 49, −13)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 62, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 80, +33)

- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good

### 2026-07-26 (score 47)

First indexed and scored.

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

## MCP tools (3)

### `challenge` (~71 tokens)

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.

### `verify` (~165 tokens)

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.

Input parameters:

- `algo` (string): Hash algorithm. Default: 'sha256'
- `difficulty` (number): Leading zero bits required. Default: matches challenge.
- `id` (string, required): Challenge id from the challenge response
- `nonce` (string, required): Nonce string the agent computed
- `salt` (string, required): Hex salt from the challenge response
- `signature` (string, required): HMAC signature from the challenge response

### `status` (~63 tokens)

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.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp#diagnostics

## Score history

- 2026-08-03: 64
- 2026-08-02: 64
- 2026-08-01: 49
- 2026-07-31: 49
- 2026-07-30: 62
- 2026-07-28: 80
- 2026-07-27: 80
- 2026-07-26: 47

## Links

- npm package: https://www.npmjs.com/package/@powforge/captcha-mcp
- Socket report: https://socket.dev/npm/package/@powforge/captcha-mcp
- Repository: https://github.com/zekebuilds-lab/captcha-mcp
- Website: https://powforge.dev/captcha
- Changelog RSS feed: https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/zekebuilds-lab-captcha-mcp/powforge-captcha-mcp