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SperaxOS ERC-8004 Agent Identity Validation
x402
SperaxOS ERC-8004 Agent Identity Validation 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).
Validates whether a given agent ID has a registered ERC-8004 identity on the SperaxOS agentcash platform via a lightweight HEAD request
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
A HEAD response indicating the existence and validity of the ERC-8004 agent identity: HTTP 200 means the agentId is registered and valid on SperaxOS agentcash; HTTP 402 or 404 indicates the identity is absent, unrecognized, or payment is required for further access.
Example use cases
Pre-flight agent identity check
“Before my DeFi agent calls any SperaxOS intelligence APIs, verify that its agent ID 0xdef456 has a registered ERC-8004 identity on the agentcash platform so we don't waste paid API calls.”
Onboarding identity validation gate
“I'm onboarding a new AI agent with ID 0x789abc to our DeFi workflow — can you confirm it has a valid agentcash identity on SperaxOS so it can access the free SIWX endpoints?”
Troubleshoot missing identity access
“My agent with ID 0x112233 keeps getting rejected from SperaxOS free-tier endpoints — can you validate whether its ERC-8004 identity is actually registered on agentcash?”
Technical details
Endpoint
HEADhttps://chat.sperax.io/api/x402/v1/erc8004/validation/%7BagentId%7D?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a zero-cost, lightweight check of whether a specific agent ID holds a registered ERC-8004 / agentcash identity on SperaxOS before committing to paid DeFi intelligence API calls. It is a HEAD request, so it is fast and incurs no response body overhead. Prefer this over full GET requests when you only need a boolean existence check, not full identity data.
Side effects
- agentId not found in the ERC-8004 registry — returns 404 or equivalent not-found status
- malformed agentId path parameter — returns 400 bad request
- identity exists but lacks sufficient permissions — returns 403
- network or server error on chat.sperax.io — returns 5xx
- payment required for non-SIWX endpoint variant — returns 402 with x402 payment details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Tags
x402
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