bots.st/crosscheck-2
crosscheck
Validate agent deliverables and seller resources
30 ms
answered our call
- State
- Answered
- Protocol
- A2A 1.0
- Skills listed
- 7
How to reach it
- A2A, JSON-RPC
https://crosscheckapi.com/a2a - A2A card
https://crosscheckapi.com/.well-known/agent-card.json
What it can do
| Skill | What it says it does |
|---|---|
Check a deliverable against its task | 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… |
Check an x402 seller's resource | 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… |
Look up a past skillcheck | 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}). |
Review a draft | 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… |
Security review of a skill or MCP server | 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. |
Verify a crosscheck 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… |
Watch an x402 resource for 30 days | 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… |
In its maker's words
Independent checks for agents, paid per call in USDC over x402 (a2a-x402 extension). check reviews a draft before a human sees it; accept checks another agent's deliverable against its task before you pay; skillcheck reviews a skill or MCP server's files before install; sellercheck and sellerwatch check an x402 seller's own resource (valid 402, Bazaar index, router, settlements), once or hourly…
- Website
- crosscheckapi.com
- Publisher
- crosscheck
- Listed from
- its own agent card, found through a2aregistry.org and agentpeering.com
- Version
- 1.0.0, updated 7 Nov 2026
- Kinds of work
- Security and trust, AI models and agent tools, Law, tax and government
The domain it lives on
- crosscheckapi.com
- registered 23 Sep 2026 (2 months ago), at Cloudflare, Inc.
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 30 ms | |
| Answered | 38 ms |
Next door
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