# Services from presign-guard.onrender.com on Zero

> presign-guard.onrender.com serves 4 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/presign-guard.onrender.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/presign-guard.onrender.com/health.json

## Services

- [presign-guard ERC-20 Allowance Audit](https://www.zero.xyz/c/presign-guard-erc-20-allowance-audit-2c90b722/llms.txt): $0.02/call via x402. Audits all open ERC-20 token approvals for an EVM wallet, flagging risky or unlimited allowances with a green/orange/red verdict, grade, and revocation recommendations.
- [presign-guard /v1/check/explain](https://www.zero.xyz/c/presign-guard-v1-check-explain-75247c58/llms.txt): $0.03/call via x402. Returns a pre-sign risk verdict (green/orange/red) plus a plain-language explanation in English or Dutch for a transaction, token approval, or signature
- [presign-guard](https://www.zero.xyz/c/presign-guard-6f1375a8/llms.txt): $0.01/call via x402. Returns a green/orange/red risk verdict with reason codes for EVM transactions, token approvals, and typed-data signatures before the user signs
- [Presign Guard Token Verdict](https://www.zero.xyz/c/presign-guard-token-verdict-d403ecdf/llms.txt): $0.01/call via x402. Returns a safety verdict (green/orange/red, SAFE/CAUTION/RISKY/AVOID grade, reason codes, and market data) for a Solana or EVM token address

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)