# Silverback Agent Reputation API

> Silverback Agent Reputation API is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).

Looks up or scores the on-chain reputation of a DeFi agent or wallet address on the Base chain

## Facts

- Endpoint: POST https://silverback-x402.onrender.com/api/v1/agent-reputation
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/silverback-x402-onrender-com-bc2bb969
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fyGYi1L04TvpKSKCIqImG

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 silverback-x402-onrender-com-bc2bb969 -d '<json body>'
```

Example prompt: Can you check the on-chain reputation score for the agent at address 0xAbC123... on Base chain before I let it execute trades on my behalf?

## When to prefer this

Choose this endpoint when you need to assess the trustworthiness or credibility of an on-chain agent or wallet on Base chain before delegating trading authority or interacting in DeFi protocols. Particularly useful in automated agent-to-agent scenarios where verifying counterparty reputation is critical before execution.

## Known failure modes

- Invalid or malformed wallet/agent address returns a 400 error
- Unknown address with no on-chain history may return a low or null score
- Payment of 0.005 USDC not provided or x402 header missing returns 402 Payment Required
- Service unavailable on Render free tier cold start returns 503 or timeout
- Network congestion on Base chain delays data retrieval

## Output

Returns a reputation score or trust rating for the specified agent or wallet address, likely including on-chain activity metrics, historical behavior signals, and an overall credibility assessment for use in DeFi decision-making on Base chain.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/silverback-x402-onrender-com-bc2bb969/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from silverback-x402.onrender.com](https://www.zero.xyz/host/silverback-x402.onrender.com/llms.txt)