claim-grounding.prospectintel.workers.dev
https://claim-grounding.prospectintel.workers.devExtract claims. Splits text into atomic, checkable claims with character spans, grounding_required, claim_type (number|date|quantity|quote|named_entity_fact|comparison|opinion|prediction|other) and check_worthiness (high|medium|low). Strips hedges, resolves pronouns across sentences, and splits compound sentences. $0.05 USDC.
Paid verification
How it worksNo sponsored paid call yet.
Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.
Quality grade
How grading works- ✓ Answers a real HTTP 402 challenge
- ✓ Publishes a /.well-known/x402 descriptor
- ✓ Payment address on record
- ✓ Settlement network declared
- ✓ Price declared
x402 readiness
Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B+, 67.5/100), which weighs availability, payability and on-chain demand. How the two differ
| Valid payment requirements | 10/10 | Payment requirements carry a payee, a mainnet network and a price. |
| Live 402 challenge | 20/25 | Endpoint reachable; its 402 challenge was seen earlier (116 ms). |
| x402 version | n/a | x402 version not observed yet. |
| Signed descriptor | n/a | No x402 standard defines a signed descriptor. |
| Uptime (30 days) | 15/15 | 32/32 probes succeeded over 30 days (100%). |
| Resource declaration | 10/10 | Declares 8 paid resource(s). |
| Verified identity | 5/10 | Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control. |
| Freshness + modern flags | 3/5 | seen within 30 days; declares x402. |
| Security declaration | n/a | Payment is the access control for an x402 resource. |
Compared with peers
Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.
- Readiness
- Higher than 67% of peers
- This listing 84 · peer median 78
- Latency
- Faster than 81% of peers
- This listing 116 ms · peer median 205 ms
Where it loses the most points, and how to win them back
- Live 402 challenge −5
— Answer the paid path with a valid 402 challenge.
Now: Endpoint reachable; its 402 challenge was seen earlier (116 ms).
- Verified identity −5
— Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
- Freshness + modern flags −2
— Keep the listing current in the registry or source it comes from.
Now: seen within 30 days; declares x402.
Paid endpoints
8 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.
https://claim-grounding.prospectintel.workers.dev/v1/extract_claims
$0.05: split any AI answer into checkable claims. Extract claims returns atomic claims with character spans, grounding_required, claim_type (number|date|quantity|quote|named_entity_fact|comparison|opinion|prediction|other) and check_worthiness (high|medium|low). Strips hedges, resolves pronouns acro
https://claim-grounding.prospectintel.workers.dev/v1/quick_check
Quick check. Fast, cheap verdict on one factual claim: supported, contradicted or unsure, with 1-2 public sources (Wikipedia, plus Wikidata where it applies) and a short reason. Synchronous. Use after Extract claims (its next_step gives the exact body); escalate unsure claims to Deep verify. $0.15 U
https://claim-grounding.prospectintel.workers.dev/v1/verify_claim
Verify claim. Checks one factual claim against public sources (Wikipedia) and returns a verdict (supported, contradicted, outdated, mixed or insufficient_evidence) with confidence, a short reason, the quote and source URL, and a receipt. $1.00 USDC.
https://claim-grounding.prospectintel.workers.dev/v1/check_answer
Check answer. Splits an AI answer into claims and checks each against Wikipedia, Wikidata and (for current claims) news. Returns per-claim verdict, confidence, quote, source URL and sentence, a source-quoted suggested_correction for wrong claims, and an answer summary with problem_sentences. $1.00 U
https://claim-grounding.prospectintel.workers.dev/v1/deep_verify
Deep verify. Use when a claim is high-stakes, or when Check answer or Extract claims marks it unsure (next_step). Checks it against Wikipedia, Wikidata, Google News, Europe PMC studies, FRED economic data and SEC EDGAR filings, and flags contradiction when sources disagree. Async: returns a job_id;
https://claim-grounding.prospectintel.workers.dev/v1/deep_research/lite
Deep Research Lite. Re-researches unsupported claims across public sources and returns a receipted result. Requires confirmed: true in the body (otherwise 400, not charged). Async: poll GET /v1/jobs/{id}. $5.00 USDC.
https://claim-grounding.prospectintel.workers.dev/v1/deep_research
Deep Research Core. Re-researches unsupported claims across public sources and returns per-claim verdicts, evidence URLs and a receipt. Requires confirmed: true in the body (otherwise 400, not charged). Async: poll GET /v1/jobs/{id}. $8.00 USDC.
https://claim-grounding.prospectintel.workers.dev/v1/deep_research/pro
Deep Research Pro. Highest-budget re-research of unsupported claims across public sources, with per-claim verdicts, evidence URLs and a receipt. Requires confirmed: true in the body (otherwise 400, not charged). Async: poll GET /v1/jobs/{id}. $15.00 USDC.
How to call
curl -sS -i -X GET https://claim-grounding.prospectintel.workers.dev # expect HTTP 402 Payment Required (about $0.05/call)Listed in
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