# SperaxOS ERC-8004 Agent Reputation Lookup

> SperaxOS ERC-8004 Agent Reputation Lookup is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).

Fetches the on-chain reputation score and recent feedback history for an ERC-8004 agent token by its token ID on a specified blockchain

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/tools/erc8004/getReputation?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/speraxos-erc-8004-agent-reputation-lookup-2c35841c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RIDebmU_40OU_qj1Ovl6M

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-reputation-lookup-2c35841c -d '<json body>'
```

Example prompt: Can you check the on-chain reputation for agent token ID 42 on bsc-testnet and show me the last 5 feedback entries?

## When to prefer this

Use this endpoint when you need to assess the trustworthiness or track record of a specific ERC-8004 agent token on-chain, especially in the SperaxOS / BSC ecosystem. Prefer this over generic off-chain reputation systems when you need verifiable, blockchain-sourced feedback tied directly to an agent's NFT identity.

## Known failure modes

- Invalid or non-existent agentId returns an error or empty reputation data
- Unsupported chain value results in a lookup failure
- Network or RPC issues on the target blockchain cause a timeout
- Payment failure via x402 protocol results in 402 Payment Required response
- Limit value out of acceptable range may cause a validation 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 the on-chain reputation data for the specified ERC-8004 agent token, including a reputation score and a list of recent feedback entries (up to the requested limit) sourced from the specified blockchain network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "bsc-testnet",
   "description": "Blockchain to query"
  },
  "limit": {
   "type": "number",
   "default": 10,
   "description": "Number of recent feedback entries to return"
  },
  "agentId": {
   "type": "string",
   "description": "The token ID of the agent"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-erc-8004-agent-reputation-lookup-2c35841c/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)