# SperaxOS ERC-8004 Agent Metadata Batch Lookup

> SperaxOS ERC-8004 Agent Metadata Batch Lookup is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).

Fetches ERC-8004 on-chain metadata for a batch of DeFi agent IDs on a specified blockchain network

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/v1/erc8004/metadata/batch?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-erc-8004-agent-metadata-batch-lookup-c6255590
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jng_CuXo5rB_6YgY4Bq7R

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-metadata-batch-lookup-c6255590 -d '<json body>'
```

Example prompt: Can you look up the ERC-8004 on-chain metadata for these three Sperax DeFi agent IDs — 0xAbc123, 0xDef456, 0xGhi789 — on the Arbitrum network?

## When to prefer this

Choose this endpoint when you need to resolve ERC-8004 on-chain metadata for multiple DeFi agent IDs in a single efficient batch call on the Sperax platform, especially when you want to avoid API key management and prefer pay-per-request USDC micropayments via x402. Ideal for agent orchestration systems, dashboards, or auditing tools that need to enrich or verify agent identity data at scale on Arbitrum or supported chains.

## Known failure modes

- Invalid or non-existent agent IDs return empty or null metadata entries
- Exceeding 50 agent IDs in a single request results in a validation error
- Unsupported chain name causes a bad request error
- Payment failure via x402 protocol results in 402 Payment Required response
- Network or RPC errors for the specified chain may cause partial or failed responses

## 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 an array of ERC-8004 metadata records corresponding to the submitted agent IDs, including on-chain descriptors and identity fields for each agent on the specified blockchain network. Up to 50 agents can be resolved per call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "arbitrum"
  },
  "agentIds": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "maxItems": 50,
   "minItems": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-erc-8004-agent-metadata-batch-lookup-c6255590/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)