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Horizon Pulse Verified Research Brief
x402
Horizon Pulse Verified Research Brief is a paid API for AI agents from horizonpulse.dev, paid per call via x402, $1/call, status unknown (last checked 2026-10-29).
Returns a cryptographically-evidenced brief answer to narrow on-chain or x402 spec questions, with 2–8 cited claims from independent sources, charged only when verification passes
Price / call$1
Success—
StatusUnknown
How this service works
Verified brief (schema brief-verified/1), on-chain live values and x402 spec facts only: answer plus 2-8 claims, each with an evidence array (verbatim quote, URL, retrieval time, body hash, offset; or chain, block and block time for on-chain reads). Charged only if >=2 claims are confirmed (2 publishers, 2 nodes, or 2 x402 spec documents) and every quote verifies; otherwise unpaid. Contract: horizonpulse.dev/contracts/brief-verified. Not advice. No personal data in q.
Output
A structured 'brief-verified/1' object containing a direct answer and 2–8 claims. Each claim includes an evidence array with verbatim quote, source URL, retrieval timestamp, body hash, and byte offset (for web sources) or chain, block number, and block timestamp (for on-chain reads). Response is only returned (and payment charged) when at least 2 claims are independently confirmed and all quotes verify; otherwise a 422 is returned unpaid.
Example use cases
On-chain Base gas fee verification
“What's the current Base network base fee right now? I need it verified from two independent sources with block numbers and timestamps so I can trust the value.”
USDC total supply on Ethereum
“How much USDC is currently in circulation on Ethereum mainnet? Give me a verified answer backed by on-chain totalSupply reads from two independent nodes.”
x402 spec fact lookup
“According to the x402 specification, what format does the payment header use? I want the answer backed by quotes from at least two separate spec documents.”
Technical details
Endpoint
GEThttps://horizonpulse.dev/api/research/report/brief?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a narrow, verifiable factual answer about Base or Ethereum gas fees, USDC on-chain supply, or x402 protocol specification details — and you require cryptographic or multi-source evidence for each claim. Prefer it over general web search or LLM-generated answers when auditability and independent source confirmation are required. It is not suitable for broad research questions, personal data queries, price speculation, or domains outside its stated scope.
Side effects
- 422 unpaid – question outside accepted scope (not Base gas, ETH gas, USDC supply, or x402 spec fact)
- 422 unpaid – fewer than 2 independent sources could confirm the claim
- 422 unpaid – quote verification failed (body hash mismatch)
- 422 – personal data detected in query parameter
- 422 – question type phrase matching failed and no type hint provided
- Payment not charged on any 422 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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