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ScrapeCheck JSON Field Verifier
x402
ScrapeCheck JSON Field Verifier is a paid API for AI agents from scrapecheck.fly.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Deterministically verifies that a claimed value exists at a specified JSON path in a live public API response, using independent double re-fetch — no LLM involved.
Price / call$0.002
Success—
StatusUnknown
How this service works
JSON tier (deterministic, no LLM): verifies a claimed value lives at a named JSON path in a public endpoint's response, by independent double re-fetch. Use it for machine-readable API responses; for HTML pages use /verify. Claim keys are paths (data.items[0].price). Type-strict; volatile values return unverifiable, never a guess. Public HTTPS JSON only. First 100 checks per client are free: resend with header X-Use-Free-Allowance: yes and no payment to use them.
Output
A signed JSON verdict object containing: a pass/fail/unverifiable verdict, a confidence score (0–1), the engine version, a unique verdict ID, cryptographic source hash, the re-fetched JSON excerpt containing the field, timestamps of both independent fetches, an ed25519 signature, and human-readable reasons explaining the verdict outcome.
Example use cases
Price integrity check for marketplace listing
“I need to verify that the API endpoint https://marketplace.example.com/api/listings/88 actually shows the price field at data.listing.price as 29.99 — I want independent double confirmation, not just trusting what the seller told me.”
Confirming API version field before integration
“Before I build against this third-party API, can you verify that https://api.theirservice.com/status returns the value 'v3' at the path meta.version? I want cryptographic proof it's actually there right now.”
Auditing a data feed claim for compliance
“Our compliance team needs to confirm that https://datafeed.partner.com/live returns the value 'active' at the JSON path feed.status — can you independently re-fetch it twice and give me a signed verdict I can attach to the audit record?”
Technical details
Endpoint
POSThttps://scrapecheck.fly.dev/verify-jsonWhen to prefer
Use this endpoint when you need deterministic, cryptographically signed proof that a specific value exists at a known JSON path in a live public API response — especially when the source is machine-readable JSON (not HTML or XML). Prefer this over HTML scraping endpoints when the data is served as structured JSON. Choose this over LLM-based verification when you need type-strict, reproducible verdicts with audit trails and signatures. Ideal for compliance audits, marketplace integrity checks, and pre-integration API validation.
Side effects
- Path not found in response — returns verdict 'fail' if the JSON path does not exist
- Type mismatch — string '42' never matches integer 42; returns 'fail' with type-strict reasoning
- Unverifiable result — volatile or rapidly changing values may return 'unverifiable' rather than pass/fail
- Endpoint requires authentication — only public HTTPS JSON endpoints are supported; returns error if auth is required
- Non-JSON response — HTML or XML endpoints must use the /verify or /verify-xml siblings instead
- Network error or endpoint unreachable — returns error if the public endpoint is down during re-fetch
- Rate limit / payment required — first 100 checks free with X-Use-Free-Allowance header; subsequent calls require $0.002 USDC payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | public HTTPS JSON endpoint (no auth) |
| claim | object | keys are JSON paths (dot/bracket form, e.g. data.items[0].price); values are the asserted values. Type-strict: "42" never matches 42. |
Output
Schema · Response
{
"type": "json",
"example": {
"engine": "web_field_v1/0.2.0+2ae28205cac4",
"key_id": "k2",
"reasons": [
"claimed value found at path \"service\" in the re-fetched JSON"
],
"verdict": "pass",
"evidence": {
"lens_votes": {},
"refetched_at": "2026-08-26T00:00:00.000Z",
"refetch_excerpt": "{\"service\":\"scrapecheck\"}",
"second_fetch_at": "2026-08-26T00:00:01.000Z"
},
"signature": "ed25519:…",
"check_type": "json_field_v1",
"confidence": 0.95,
"verdict_id": "00000000-0000-0000-0000-000000000000",
"source_hash": "sha256:…",
"verifier_url": "https://scrapecheck.fly.dev"
}
}Tags
x402
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