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SperaxOS ERC-8004 Agent Reputation HEAD Check
x402
SperaxOS ERC-8004 Agent Reputation HEAD Check is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Checks the ERC-8004 reputation metadata availability for a given agent ID on the SperaxOS DeFi intelligence platform via a lightweight HEAD request, payable with USDC on Base.
Price / call$0.001
Success—
StatusUnknown
How this service works
AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.
Output
Returns HTTP headers only (HEAD response) indicating whether an ERC-8004 reputation record exists for the specified agent ID. Status codes and headers signal availability; no response body is returned. Costs $0.001 USDC per call via x402 payment protocol.
Example use cases
Pre-interaction agent reputation check
“Before I let this DeFi agent 0xDEADBEEF interact with my funds, can you verify it actually has a reputation record registered on SperaxOS?”
Agent fleet onboarding validation
“I'm onboarding a set of agents — can you check whether agent ID 0x1234ABCD has an ERC-8004 reputation profile on SperaxOS so I know it's already registered?”
DeFi protocol trust screening
“Check if the agent 0x9876FEDC is listed with a reputation on the SperaxOS ERC-8004 registry — I want to know if it's a known entity before routing any transactions through it.”
Technical details
Endpoint
HEADhttps://chat.sperax.io/api/x402/v1/erc8004/reputation/%7BagentId%7D?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, low-cost existence check for an agent's ERC-8004 reputation record without fetching the full payload. Ideal for pre-flight validation before deeper DeFi interactions, and preferable over a GET when you only need to confirm presence. Requires no API key — only a USDC micropayment on Base via x402.
Side effects
- 404 Not Found — agent ID has no ERC-8004 reputation record registered
- 402 Payment Required — USDC payment not attached or insufficient
- 400 Bad Request — malformed agentId in the URL path
- 503 Service Unavailable — SperaxOS backend temporarily down
- Payment failure on Base network — transaction not confirmed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Tags
x402
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