# SperaxOS ERC-8004 Agent Feedback Submission

> SperaxOS ERC-8004 Agent Feedback Submission 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).

Submits a reputation score and text feedback for an on-chain agent registered under the ERC-8004 standard on a specified blockchain

## Facts

- Endpoint: POST https://chat.sperax.io/api/x402/tools/erc8004/submitFeedback?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-feedback-submission-d0a5eb61
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eI71CIn4SiS1qL5dQblq1

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-submission-d0a5eb61 -d '<json body>'
```

Example prompt: Submit feedback for agent ID 42 on bsc-testnet with a reputation score of 85 and the comment 'Executed the swap efficiently with no slippage issues'.

## When to prefer this

Use this endpoint when you need to record on-chain reputation data for an ERC-8004 registered agent, especially in DeFi or multi-agent ecosystems where agent trustworthiness is tracked via numeric scores and text reviews. Prefer this over off-chain rating systems when immutability and on-chain verifiability of the reputation record are required.

## Known failure modes

- Invalid agentId (non-existent token ID) returns an error
- Score outside the -128 to 127 range is rejected
- Unsupported chain identifier causes a routing error
- Payment of 0.001 USDC via x402 protocol fails if wallet has insufficient balance
- Malformed comment field may be rejected
- Network congestion on the target chain can delay submission

## 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 and reputation score have been recorded on-chain for the specified agent token ID, typically returning a transaction reference or success status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "bsc-testnet",
   "description": "Blockchain where the agent is registered"
  },
  "score": {
   "type": "number",
   "maximum": 127,
   "minimum": -128,
   "description": "Reputation score from -128 to 127"
  },
  "agentId": {
   "type": "string",
   "description": "The token ID of the agent to rate"
  },
  "comment": {
   "type": "string",
   "description": "Text feedback/review for the agent"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/speraxos-erc-8004-agent-feedback-submission-d0a5eb61/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)