# SperaxOS ERC-8004 Agent Feedback

> SperaxOS ERC-8004 Agent Feedback is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-15).

Submit a scored feedback rating and comment about a specific DeFi agent on the SperaxOS platform, paid per-call with USDC via x402

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/v1/erc8004/feedback?utm_source=zero.xyz
- Price: $0.001/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-feedback-3a5908b9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Oql-wR_iNhRo7Dx8PImgW

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-feedback-3a5908b9 -d '<json body>'
```

Example prompt: Submit feedback on SperaxOS for agent 0xAbC123...def456 from my wallet 0x1234...abcd — give it a score of 85 and comment 'Accurate yield recommendations, responded quickly' on Arbitrum.

## When to prefer this

Use this endpoint when you need to programmatically submit scored, commented feedback on a specific ERC-8004 compatible DeFi agent in the SperaxOS ecosystem. It is the right choice when you have a wallet address, agent ID, and a numeric score to record. Prefer this over manual review platforms when integrating agent quality signals into automated pipelines or building reputation systems for on-chain AI agents.

## Known failure modes

- Invalid wallet address format (must match 0x hex pattern) returns validation error
- Score out of range (must be -128 to 127) returns 400 error
- Comment too long (over 1000 chars) or empty (0 chars) returns validation error
- Missing agentId returns required field error
- Payment not included or insufficient USDC triggers x402 payment required response
- Unsupported chain value returns 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

A confirmation that the feedback record has been stored on-chain or in the SperaxOS platform, associating the score and comment with the specified agent ID and wallet address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "arbitrum"
  },
  "score": {
   "type": "integer",
   "maximum": 127,
   "minimum": -128
  },
  "agentId": {
   "type": "string"
  },
  "comment": {
   "type": "string",
   "maxLength": 1000,
   "minLength": 1
  },
  "walletAddress": {
   "type": "string",
   "pattern": "^0x[a-fA-F0-9]{40}$"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-erc-8004-agent-feedback-3a5908b9/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)