MCP server

crosscheck

com.crosscheckapi/crosscheck

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

Website Source

At a glance

Type

MCP server

Publisher

crosscheckapi.com (verified by the MCP Registry)

Status

Working at last check

Tools

8

Token cost

About 2,942 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http crosscheck https://crosscheckapi.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.crosscheck]
url = "https://crosscheckapi.com/mcp"

Gemini CLI

{"mcpServers":{"crosscheck":{"httpUrl":"https://crosscheckapi.com/mcp"}}}

Cursor

{"mcpServers":{"crosscheck":{"url":"https://crosscheckapi.com/mcp"}}}

VS Code

{"servers":{"crosscheck":{"type":"http","url":"https://crosscheckapi.com/mcp"}}}

Antigravity

agy mcp add crosscheck https://crosscheckapi.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"crosscheck","server_url":"https://crosscheckapi.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"crosscheck","server_url":"https://crosscheckapi.com/mcp"}

Tools

• accept ~398 tokens
  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 verify_externally with every requirement judged; counts, required JSON fields, and sums are checked in code. Optional payment_tx is verified on chain. $0.03
• check ~754 tokens
  Independent review of a draft (email, report, summary, PR description) before its human sees it. Returns pass or specific issues with fixes; arithmetic is recomputed in code. With request (what the human asked), it also checks the draft answers that. With sources, each claim is checked against them
• result ~116 tokens
  Free. Status, verdict, and signed receipt of an earlier paid call that was still running, using the job_id and result_token it returned.
• sellercheck ~326 tokens
  For x402 sellers: one dated report on your own paid resource, by code alone. Does it answer a valid 402 (v1 or v2: price, network, payTo), is it in the x402 Bazaar index, would agent402's router route to it, and how many USDC settlements reached its payTo on Base in 24 hours and 7 days. Nothing is p
• sellerwatch ~430 tokens
  For x402 sellers: sellercheck every hour for 30 days on one resource, paid once. An alert to your webhook (JSON POST) or ntfy topic only when something changes: the 402 breaks or its price or payTo change, it leaves or rejoins the Bazaar index, agent402's router flips, settlements start, double, or
• skillcheck ~375 tokens
  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 by bundle hash); otherwise paid, $0.03 base. Never says safe. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x
• skillcheck_lookup ~96 tokens
  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 ~447 tokens
  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 that it covers exactly the text you were handed. Pass receipt_hash (or the receipt object) plus that text: draft, request, and sources for che

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