Claim Grounding

TruePoint Prospect Intelligence & Claim Grounding

Pay-per-call APIs for AI agents. Pay USDC on Base per call with x402. No API key, no signup. People can pay by card instead.

• Prospect Intelligence: work-email lookup and company research for sales agents.
• Claim Grounding: checks factual claims against public sources and returns a verdict, confidence and citations.

Accuracy results: https://claim-grounding.prospectintel.workers.dev/accuracy (92 of 100 hard claims right on Deep verify, 0 confidently wrong; 38 of 38 found emails exactly right). Read the limitations there too.

30-second quickstart

Option A: Coinbase agentic wallet (`awal`)

npx awal@latest status          # sign in / check wallet

npx awal@latest balance # needs USDC on Base npx awal@latest x402 pay https://claim-grounding.prospectintel.workers.dev/v1/verify_claim \ -X POST -d '{"claim":{"text":"The Eiffel Tower is in Paris"}}' --max-amount 1000000

--max-amount is in USDC atomic units (1000000 = $1.00), so you can never pay more than you set.

Option B: any x402 client. Call the endpoint with no payment. You get HTTP 402 with the price in the body and a payment-required header. Sign the payment with your x402 client and retry. Settlement uses the Coinbase CDP facilitator on Base (eip155:8453).

Option C: MCP. Point an MCP client (streamable HTTP) at:

• https://claim-grounding.prospectintel.workers.dev/mcp
• https://prospect-intelligence.prospectintel.workers.dev/mcp

tools/list is free. Tool calls return x402 payment instructions; the paid HTTP route does the work.

Option D: pay by card (people). Stripe checkout, no wallet needed:

Card prices are higher than agent prices because Stripe has a $0.50 minimum and per-charge fees.

Prices (USDC per call)

Claim Grounding: https://claim-grounding.prospectintel.workers.dev

Verdicts: supported, contradicted, outdated, mixed, insufficient_evidence.

Prospect Intelligence: https://prospect-intelligence.prospectintel.workers.dev

Sample request and response

Request (real, paid, Oct 12, 2026):

npx awal@latest x402 pay https://claim-grounding.prospectintel.workers.dev/v1/verify_claim \

-X POST -d '{"claim":{"text":"The Eiffel Tower is in Paris"}}'

Response (HTTP 200, shortened with …):

{

"mode": "fast", "job_id": null, "claim": { "claim_id": "clm_14b3ffa736fd4fd1", "text": "The Eiffel Tower is in Paris", "span": { "start": 0, "end": 29 }, "grounding_required": true, "verdict": "supported", "status_detail": "supported", "confidence": 0.95, "citations": [ { "url": "https://en.wikipedia.org/wiki/Eiffel_Tower", "title": "Eiffel Tower", "quote": "The Eiffel Tower is a lattice tower on the …", "retrieved_at": "…", "provider": "wikipedia" } ], "rationale_short": "…" }, "why": "…", "source": "https://en.wikipedia.org/wiki/Eiffel_Tower", "receipt": { "claim_hashes": ["sha256:…"], "evidence_urls": ["https://en.wikipedia.org/wiki/Eiffel_Tower"], "verdicts": ["supported"], "priced_usd": 1, "created_at": "…" } }

Paid on Base: tx 0x839f…a901.

The unpaid first call (real, live) returns HTTP 402:

{

"x402Version": 2, "error": "Payment required", "accepts": [{ "scheme": "exact", "network": "eip155:8453", "amount": "80000", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0x485FfC037f02dDDc154A454a9cA89C4B1b29e25b", "maxTimeoutSeconds": 300, "extra": { "name": "USD Coin", "version": "2" } }] }

(80000 = $0.08 for /v1/email. The asset is USDC on Base.)

Errors

x402 only settles payment on a 2xx response, so failed calls cost nothing.

What these tools don't do

• Not legal, medical, financial or compliance advice. Not a certification.
• English only. Public sources only; no paywalled or private documents.
• Can return insufficient_evidence. Very recent news may lag.
• No guarantee an email is delivered or read. No personal/private emails, no phone numbers.
• Decision-makers are unknown unless a public source names them. Nothing is invented.

Discovery

/docs · /.well-known/x402 · /openapi.json · /llms.txt · /.well-known/mcp/server-card.json on each host. Listed on agentic.market.

Worker source stays private; this repo is the public surface for agents and builders.

Support

• Email: truepointmarketingpartners@gmail.com
• Phone: (951) 234-7620
• Site: https://www.truepointmarketingpartners.com/ai-agent-tools