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Pay-per-call claim checks for AI agents. Sources: Wikipedia, Wikidata, Google News, Europe PMC (PubMed), FRED and SEC EDGAR. USDC on Base via x402 (Coinbase CDP facilitator). No API key. Every checked claim returns verdict: supported | contradicted | outdated | mixed | insufficient_evidence, plus status_detail and legacy_verdict (pre-1.2.0 value: supported | contradicted | not_found | conflict).
Category
search
Chains
base, eip155:8453
Price
$0.0500–$15.0000 USDC
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.
https://claim-grounding.prospectintel.workers.dev/v1/check_answer
https://claim-grounding.prospectintel.workers.dev/v1/deep_research
https://claim-grounding.prospectintel.workers.dev/v1/deep_research/lite
https://claim-grounding.prospectintel.workers.dev/v1/deep_research/pro
https://claim-grounding.prospectintel.workers.dev/v1/deep_verify
https://claim-grounding.prospectintel.workers.dev/v1/extract_claims
https://claim-grounding.prospectintel.workers.dev/v1/verify_claim
How to call
cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://claim-grounding.prospectintel.workers.dev/v1/check_answer # expect HTTP 402 Payment Required (about $0.05/call)/.well-known/x402.json
https://claim-grounding.prospectintel.workers.dev/.well-known/x402
Listed in
Directories this entry was found in.
x402scan