crosscheck

Name: crosscheck
Author: crosscheck

AgentA2A

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. Every answer carries a signe…

by crosscheckhomepage ↗v1.0.0

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Observed by Wellknown

Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability19/22 checks ok

when	check	result	http	latency	detail
1 h ago	a2a card	ok	200	444 ms	protocol 0.3.0 · card: crosscheck · 5 skills
7 h ago	a2a card	ok	200	454 ms	protocol 0.3.0 · card: crosscheck · 5 skills
14 h ago	a2a card	ok	200	450 ms	protocol 0.3.0 · card: crosscheck · 5 skills
21 h ago	a2a card	ok	200	472 ms	protocol 0.3.0 · card: crosscheck · 5 skills
28 h ago	a2a card	ok	200	454 ms	protocol 0.3.0 · card: crosscheck · 5 skills
35 h ago	a2a card	ok	200	487 ms	protocol 0.3.0 · card: crosscheck · 5 skills
2 d ago	a2a card	ok	200	446 ms	protocol 0.3.0 · card: crosscheck · 5 skills
2 d ago	a2a card	ok	200	448 ms	protocol 0.3.0 · card: crosscheck · 5 skills
2 d ago	a2a card	ok	200	466 ms	protocol 0.3.0 · card: crosscheck · 5 skills
3 d ago	a2a card	ok	200	476 ms	protocol 0.3.0 · card: crosscheck · 5 skills

Declared by sources

What the publisher says

Attributed to the source that supplied each field. Treated as claims, not facts.

reviewfact-checkhallucinationgroundingproofreadacceptance-testverify-deliverableescrowagent-commercesecuritymcpskill-securityprompt-injectionmalware-scanlookupfreeverifyreceipttrust

Declared skills

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 them and quotes are verified; with source_urls or fetch_cited, crosscheck fetches up to 3 web pages itself and checks against those (+$0.01 a page, and a dead link the draft gives fails it). $0.02. Paid p…
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. $0.03 base. Paid per call in USDC over x402.
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.
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}).
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 check, task and deliverable for accept, files for skillcheck, and the verdict if one came with it.

kind A2A Agent Card

name A2A Agent Card

summary A2A Agent Card

version A2A Agent Card

description A2A Agent Card

homepageUrl A2A Agent Card

publisherUrl A2A Agent Card

publisherName A2A Agent Card

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

A2A Agent Cardhttps://crosscheckapi.com/.well-known/agent-card.json

first seen 9 d ago · fetched 9 d agoopen ↗

Field history (7 recent events)

9 d ago · declared · summary → "Independent checks for agents, paid per call in USDC over x402 (a2a-x402 extension). check reviews a draft before a hum
9 d ago · declared · description → "Independent checks for agents, paid per call in USDC over x402 (a2a-x402 extension). check reviews a draft before a hum
9 d ago · declared · publisherName → "crosscheck"
9 d ago · declared · publisherUrl → "https://crosscheckapi.com"
9 d ago · declared · homepageUrl → "https://crosscheckapi.com/llms.txt"
9 d ago · declared · version → "1.0.0"
9 d ago · declared · protocols → ["a2a"]

This record is unclaimed

Evidence

What the publisher says

Capabilities

Where this record came from