# SperaxOS ERC-8004 Agent Search API

> SperaxOS ERC-8004 Agent Search API is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).

Search for ERC-8004 compliant AI agents registered on the SperaxOS DeFi intelligence platform, payable via x402 USDC micropayments on Base

## Facts

- Endpoint: GET https://chat.sperax.io/api/x402/v1/erc8004/agents/search?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-erc-8004-agent-search-api-40858577
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VUcYOO_ah57QsapAc_5xo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability speraxos-erc-8004-agent-search-api-40858577
```

Example prompt: Search the SperaxOS agent registry for ERC-8004 agents that specialize in yield optimization on Base — show me their capabilities and metadata.

## When to prefer this

Choose this endpoint when you need to discover or enumerate AI agents registered under the ERC-8004 standard on the SperaxOS platform, particularly for DeFi-focused agent workflows on Base. Prefer this over generic agent directories when you specifically need on-chain DeFi agents payable via x402 USDC micropayments with no API key friction.

## Known failure modes

- Insufficient USDC balance for x402 micropayment returns 402 Payment Required
- Invalid or malformed query parameters return 400 Bad Request
- No agents match the given search criteria returns empty result set
- Network or Base chain connectivity issues may cause timeouts
- Unrecognized property filters silently ignored or return error

## 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 a list of ERC-8004 compliant AI agents registered on the SperaxOS platform, including their metadata, capabilities, on-chain properties, and any relevant DeFi specializations. Each result represents a discoverable agent that can be further queried or invoked.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-erc-8004-agent-search-api-40858577/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chat.sperax.io](https://www.zero.xyz/host/chat.sperax.io/llms.txt)