crosscheck
Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.
Connect it
Settings → Connectors → Add custom connector
URL: https://crosscheckapi.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://crosscheckapi.com/mcp{
"mcpServers": {
"crosscheck": {
"url": "https://crosscheckapi.com/mcp"
}
}
}claude mcp add --transport http crosscheck https://crosscheckapi.com/mcp{
"servers": {
"crosscheck": {
"type": "http",
"url": "https://crosscheckapi.com/mcp"
}
}
}{
"mcpServers": {
"crosscheck": {
"command": "npx",
"args": [
"-y",
"crosscheckapi@0.5.5"
],
"env": {
"CROSSCHECK_WALLET_KEY": "<value>"
}
}
}
}claude mcp add crosscheck -- npx -y crosscheckapi@0.5.56 tools, verified live
checkIndependent 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 and quotes are verified; with source_urls or fetch_cited, crosscheck fetches up to 3 web pages itsel
acceptChecks 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 base. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia). An x402-aware MCP c
skillcheckSecurity 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 x402-aware MCP client pays automatically: the first call returns the price as an x402 PaymentRequired
skillcheck_lookupFree. 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_receiptFree. 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 check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.
resultFree. Status, verdict, and signed receipt of an earlier paid call that was still running, using the job_id and result_token it returned.
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