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Claim Grounding

https://claim-grounding.prospectintel.workers.dev/v1/extract_claims
● healthy a2a-agent

Agent-runtime claim grounding. Fast gate is paid. Deep Research is a confirmed separate call.

Category
a2a-agent
Chains
base
Price
$0.0500 USDC / call

Quality grade

How grading works
C+ 60.0 / 100
Availability 40.0 / 40
Endpoint responded (HTTP 402)
Payability 20.0 / 20
  • ✓ Answers a real HTTP 402 challenge
  • ✓ Publishes a /.well-known/x402 descriptor
  • ✓ Payment address on record
  • ✓ Settlement network declared
  • ✓ Price declared
Demand 0.0 / 40
Payment address on record, not yet queried on-chain
Owner verified 0.0 / 3
Nobody has claimed this listing yet
Endpoint last checked 9 h ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass.

Paid endpoints

7 resource(s) advertised by this origin.

POST https://claim-grounding.prospectintel.workers.dev/v1/extract_claims

Extract 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 comp

POST 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 Checks one factual claim against public sources (Wikipedia) and returns a verdict (supported, contradicted, outdated, mixed or insufficient_evidence) with confidence, a short reason, the quote and source URL, and a receipt.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.

POST 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

POST https://claim-grounding.prospectintel.workers.dev/v1/deep_verify

Deep verify. Checks a claim against Wikipedia, Google News titles, Europe PMC reviews and trials (health and science claims), FRED data (US economic indicators), Wikidata structured facts (dates, quantities, offices held) and SEC EDGAR filings (US public companies: financials, listing status, former

POST 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.

POST 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.

POST 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 · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X POST https://claim-grounding.prospectintel.workers.dev/v1/extract_claims  # expect HTTP 402 Payment Required (about 0.05 USDC/call)
/.well-known/x402.json
https://claim-grounding.prospectintel.workers.dev/.well-known/x402

Listed in

Directories this entry was found in.

a2a x402