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CrossCheck Verify Deliverable – Code Only (Lite)
x402
CrossCheck Verify Deliverable – Code Only (Lite) is a paid API for AI agents from crosscheckapi.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).
Programmatically verifies an AI agent's deliverable using deterministic code checks—no model call—for $0.005, returning a signed receipt with pass/fail judgments on math, lengths, dates, placeholders, and structure.
Price / call$0.005
Success—
StatusUnknown
How this service works
Verify output another AI agent hands back, by code alone, for $0.005: no model call, answers in about a second. Recomputes the deliverable's written sums, totals, percentages, dates, weekdays, time spans, unit conversions, and list counts; checks lengths the task asks for; flags placeholders and prompt injection; measures words, items, and JSON shape. Signed receipt, tier lite. For every requirement judged, use accept ($0.03).
Output
A signed lite-tier receipt containing deterministic code-based judgments: recomputed arithmetic (sums, totals, percentages), date and weekday correctness, time spans, unit conversions, list and item counts, word counts, length compliance against task requirements, JSON shape validation, flagged placeholders, and flagged prompt injection attempts. Each requirement is judged accept/fail. No model was invoked; the result arrives in approximately one second.
Example use cases
Invoice arithmetic check before payment release
“Before I release payment to the content agent, run a $0.005 code-only CrossCheck on its deliverable — the task was 'produce an invoice with three line items totaling $4,750, including 8% tax', and here's exactly what it returned. I need to confirm the sums, tax percentage, and final total are all correct.”
Word count and length requirement audit
“The copywriting agent just handed back a blog post — the task required exactly 800 words and three numbered sections. Can you run a CrossCheck lite verify on it to confirm the word count and list structure match those requirements, without calling any AI model?”
Placeholder and prompt injection detection
“Before I pass this agent-generated contract draft to the next step in my pipeline, run a CrossCheck code-only scan on it — the original task was 'draft a two-page NDA with all parties named', and I want to make sure there are no unfilled placeholders like [INSERT NAME] or any injected instructions hiding in the text.”
Technical details
Endpoint
POSThttps://crosscheckapi.com/v1/accept-lite?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast (≈1 second), cheap ($0.005) deterministic sanity check on an AI agent's deliverable and do not need a model-based reasoning pass. It is ideal for high-volume pipelines where most failures are arithmetic errors, missing word counts, stray placeholders, or structural mismatches — not nuanced factual claims. Prefer this over the escrow-gated or fact-check sibling endpoints when cost and latency matter more than deep semantic verification, or as a first-pass filter before calling more expensive checks.
Side effects
- Task or deliverable fields missing or empty — returns 400 validation error
- Deliverable too large for lite tier — may return payload size error
- Payment transaction hash not found on-chain — receipt may not bind payment
- Network mismatch for payment_tx — defaults to eip155:8453 if not specified
- Referral hash malformed (not 64 hex chars) — rejected with pattern validation error
- Arithmetic in deliverable uses ambiguous formatting — code parser may misread numbers
- No verifiable numeric or structural content in deliverable — receipt may show no judgments made
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 |
Tags
x402
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