# SperaxOS ERC-8004 Agent Registry Lookup

> SperaxOS ERC-8004 Agent Registry Lookup is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).

Lists or retrieves ERC-8004 compliant DeFi agents registered on the SperaxOS platform, payable per-request with USDC via x402.

## Facts

- Endpoint: GET https://chat.sperax.io/api/x402/v1/erc8004/agents?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-erc-8004-agent-registry-lookup-4897af0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GCY4hSBB4wCtqP2pzTfWV

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-registry-lookup-4897af0d
```

Example prompt: Show me all the AI-powered DeFi agents registered on SperaxOS that follow the ERC-8004 standard — I want to browse what's available on the platform.

## When to prefer this

Choose this endpoint when you need to enumerate or discover AI agent identities registered under the ERC-8004 standard on the SperaxOS platform specifically. Prefer this over generic blockchain indexers when you need SperaxOS-curated agent metadata, or when you want pay-per-request access without API key registration using USDC on Base.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 with payment requirements
- Malformed query parameters — returns 400 with validation error
- Registry temporarily unavailable — returns 503
- No agents match the provided filter criteria — returns empty list with 200
- Network congestion on Base causing slow settlement — delayed response

## 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 agent records from the SperaxOS registry, including agent addresses, metadata, and capability descriptors for DeFi agents deployed on Base. Each record follows the ERC-8004 standard for on-chain agent identity.

## 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-registry-lookup-4897af0d/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)