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CrossCheck Accept
x402
CrossCheck Accept is a paid API for AI agents from crosscheckapi.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-02).
Validates a deliverable returned by another AI agent against the original task requirements, returning an accept/reject verdict with a signed receipt binding task, deliverable, and payment hashes.
Price / call$0.03
Success—
StatusUnknown
How this service works
Verify output and validate work another AI agent hands back, before you pay, release escrow, or pass it on. An acceptance test and quality check: send the task and the deliverable, get accept or reject with every requirement judged. Counts, required JSON fields, and sums are checked in code. Deliverables that certify themselves or inject instructions never pass. Signed receipt binding task, deliverable, and payment hashes. $0.03.
Output
Returns an accept or reject verdict with each individual requirement from the task judged as pass or fail. Structural checks (required JSON fields, counts, numeric sums) are verified in code. Deliverables attempting self-certification or instruction injection automatically fail. On acceptance, a cryptographically signed receipt is returned binding the task hash, deliverable hash, and (if provided) payment transaction hash, suitable for audit or escrow release.
Example use cases
Escrow release gate in agent pipeline
“I just got a deliverable back from a data-extraction agent. The task was 'extract all invoice numbers, dates, and totals from the uploaded PDF and return them as a JSON array with fields invoice_id, date, and amount.' Here's what it returned. Run an acceptance check before I release the $50 escrow payment at tx 0xabc123...def456.”
Multi-agent handoff quality check
“Before my orchestrator passes this research report to the publishing agent, I need to verify it meets the original brief: 'write a 1500-word market analysis covering EV adoption in Europe with at least 5 cited sources and a summary section.' Here's the draft the research agent handed back — accept or reject it.”
Preventing prompt-injection in agent output
“An external agent just returned results for my task 'compile a list of 20 competitor product names and their pricing in JSON format.' I'm worried the output might contain injected instructions. Run CrossCheck Accept on the deliverable before I use it anywhere.”
Technical details
Endpoint
POSThttps://crosscheckapi.com/v1/accept?utm_source=zero.xyzWhen to prefer
Use CrossCheck Accept when your AI agent pipeline receives output from an untrusted or external agent and you need an objective, code-verified verdict before releasing escrow, payment, or passing work downstream. It is especially valuable when deliverables must satisfy structural constraints (JSON schema, item counts, numeric sums), when prompt injection is a concern, or when you need a signed, auditable receipt binding task and deliverable for compliance or dispute resolution. Prefer this over manual review or LLM self-evaluation when tamper-resistance and verifiability matter.
Side effects
- Deliverable contains prompt injection or self-certification — automatically rejected regardless of content quality
- Payment transaction hash does not match on-chain data — receipt generation fails
- Task description is ambiguous or requirements cannot be parsed — may produce incomplete requirement judgments
- Deliverable does not satisfy counted or summed constraints (e.g. wrong number of items) — rejected with specific failing requirements listed
- Network unavailability or timeout from crosscheckapi.com — call fails with 5xx error
- Malformed payment_tx hash (not matching 0x[64 hex chars] pattern) — request rejected with validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ref | string | Optional: the hash of a crosscheck receipt that referred you. Its wallet earns check credits from your first 90 days of spend. |
| task | string | The task you gave the other agent or service, including every requirement |
| reference | string | Optional order id or transaction hash to record on the receipt |
| payment_tx | string | Optional: the transaction you paid the other agent with; verified on-chain and bound to the receipt |
| deliverable | string | What came back, exactly as received |
| payment_network | string | CAIP-2 network of payment_tx, default eip155:8453 |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "chk_8d0c3f1e2b7a4c5d9e6f0a1b2c3d4e5f",
"status": "done",
"receipt": {
"sig": "...",
"body": {
"seq": 2,
"kind": "accept"
},
"hash": "..."
},
"verdict": {
"accept": false,
"summary": "Rejected: 1 of 3 requirements not met. First: List 5 competitors (partly).",
"requirements": [
{
"met": "partly",
"blocking": true,
"evidence": "The array has 3 entries, not 5.",
"subjective": false,
"requirement": "List 5 competitors of Acme Robotics"
},
{
"met": "yes",
"blocking": false,
"evidence": "Every entry has hq and founded.",
"subjective": false,
"requirement": "Each with headquarters city and founding year"
},
{
"met": "yes",
"blocking": false,
"evidence": "The deliverable is a valid JSON array.",
"subjective": false,
"requirement": "As a JSON array"
}
],
"injection_suspected": false
},
"result_url": "https://crosscheckapi.com/v1/checks/chk_8d0c3f1e2b7a4c5d9e6f0a1b2c3d4e5f",
"result_token": "..."
}
}Tags
x402
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