crosscheck
Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.
| Endpoint | https://crosscheckapi.com/mcp (streamable-http) |
|---|---|
| Registry version | 0.6.0 |
| Now | 8 tools · grade B (85) · pin ts_af06449f5cc4358658914a735c963e15 · protocol 2025-06-18 |
| First / last listed | 2026-10-25 03:30 UTC / 2026-10-25 03:30 UTC |
| Grade over time | 2026-10-25: B (85), 8 tools |
Is this your server? Own a server? ToolFit hosted watch re-checks it every 24 h ($0.25 per 30 days) or 6 h ($0.60) and sends you an HMAC-signed webhook when its tools or grade change: POST https://api.youraitools.co/toolfit/v1/watch. To opt out, see About & opt-out.
Tools: check accept skillcheck sellercheck sellerwatch skillcheck_lookup verify_receipt result
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 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 params: draft*, request, sources, source_urls, fetch_cited, open_review, moltbook_identity, ref |
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 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 params: task*, deliverable*, reference, payment_tx, payment_network, ref |
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 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 params: files*, fresh, ref |
sellercheck | 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 paid to the resource. $0.05. Paid per call in USDC over x402 (Base, or free test USDC on Base Sepolia params: resource*, method, network |
sellerwatch | 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 halve, or it is down twice in a row. Returns a public record page to link from your listing. $1. Pai params: resource*, method, network, notify* |
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}). params: bundle_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 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. params: receipt_hash, receipt, draft, request, sources, task, deliverable, files, verdict |
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. params: job_id*, result_token* |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.