# crosscheck

> crosscheck, an MCP server by crosscheckapi.com, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

- Canonical: https://www.anchorterminal.com/tools/crosscheckapi-crosscheck
- Markdown: https://www.anchorterminal.com/tools/crosscheckapi-crosscheck.md (~1,000 tokens)
- Slim: https://www.anchorterminal.com/tools/crosscheckapi-crosscheck.min.md (~930 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/crosscheckapi-crosscheck.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

# crosscheck

> Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: MCP server, by crosscheckapi.com (https://crosscheckapi.com)
- Category: Payment & monetisation platforms (https://www.anchorterminal.com/categories/payment-platforms.md)
- Listed because: It's published in the registry under crosscheckapi.com, a namespace the registry only gives to whoever proves they control that domain. It's in real use: 1,663 npm downloads a week.
- What the official MCP registry says: Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

## Facts

- MCP registry: `com.crosscheckapi/crosscheck` 0.5.5
- Endpoint: https://crosscheckapi.com/mcp (streamable HTTP)
- Package: npm `crosscheckapi` (stdio)
- Source: https://github.com/maxugc/crosscheck
- Website: https://crosscheckapi.com
- npm downloads a week: 1,663
- GitHub stars: 0
- Registry entry updated: 2026-09-28

## Tools

- Tools it lists (6, about 1,965 tokens of context, `tools/list` without credentials, checked 2026-10-04 22:22 UTC):
  - `check`: Independent review of a draft (email, report, summary, PR description) before its human sees it. Returns pass or specific issues with fixes; arithmetic is…
  - `accept`: Checks work another agent handed back against the task it was given, before you pay, release escrow, or pass it on. Returns accept, reject, or…
  - `skillcheck`: Security review of a skill or MCP server's files before you install or connect it: read, never run. Free when these exact files were scanned before (looked up…
  - `skillcheck_lookup`: Free. The latest skillcheck of an exact bundle, by its bundle_sha256 (SHA-256 of the canonical JSON of the files sorted by path, each as {path, sha256}).
  - `verify_receipt`: Free. Before trusting work that arrives with a crosscheck receipt, check in code that crosscheck issued it, its signature is valid, what the outcome was, and…
  - `result`: Free. Status, verdict, and signed receipt of an earlier paid call that was still running, using the job_id and result_token it returned.
- How its tools read to an agent (0 errors, 8 warnings, 1 note, about 1,965 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):
  - warn TC11 skillcheck_lookup: its one parameter, bundle_sha256, has no description
  - warn TC13 verify_receipt: receipt (object with no properties), sources (array with no items), verdict (object with no properties)
  - warn TC16 accept: no readOnlyHint or destructiveHint
  - warn TC16 check: no readOnlyHint or destructiveHint
  - warn TC16 result: no readOnlyHint or destructiveHint
  - warn TC16 skillcheck: no readOnlyHint or destructiveHint
  - warn TC16 skillcheck_lookup: no readOnlyHint or destructiveHint
  - warn TC16 verify_receipt: no readOnlyHint or destructiveHint
  - note TC24 server: 6 of 6 tools have no outputSchema

- JSON: https://www.anchorterminal.com/api/v1/tools/crosscheckapi-crosscheck.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming