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PayAI EVM Transaction Pre-Sign Safety Check
x402
PayAI EVM Transaction Pre-Sign Safety Check is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Analyzes a raw EVM transaction before signing — decoding calldata, checking scam blocklists, simulating reverts, and returning an allow/warn/block verdict with a 0-100 risk score.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pre-sign safety verdict for a raw EVM transaction. Decodes the calldata against a known-signature registry, shows known-pattern effects (approval delta, transfer target), dry-runs eth_call for revert, checks scam-blocklist and approval-hygiene, and returns allow, warn or block plus a 0-100 risk. Risk indicators, not advice.
Output
Returns a safety verdict of 'allow', 'warn', or 'block', a numeric risk score from 0 to 100, decoded calldata effects (approval delta, transfer target), a dry-run revert status, and scam blocklist and approval hygiene findings. All outputs are risk indicators, not financial advice.
Example use cases
DeFi approval scam detection
“I'm about to approve a token spend on this DeFi site — can you check the raw calldata 0x095ea7b3000000000000000000000000deadbeef...ffffffff going to 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Ethereum and tell me if this approval looks suspicious or if the spender is on any scam lists?”
Pre-sign revert simulation
“Can you dry-run this transaction for me before I send it? It's from 0xMyWallet going to 0xContractAddress on Arbitrum with calldata 0xa9059cbb... and value 0 — I want to know if it'll revert and whether it's flagged as risky.”
Wallet agent transaction guardrail
“My agent is about to submit a transaction on Polygon — destination 0x1234abcd, calldata 0x38ed1739..., sent from 0xMyAgent — run a pre-sign safety check and block it if the risk score is above 50 or it's flagged as a block verdict.”
Technical details
Endpoint
POSThttps://payai.agentstools.dev/tx/rawWhen to prefer
Use this endpoint when an AI agent or wallet needs to gate-check any raw EVM transaction before signing — especially for token approvals, transfers, or contract interactions on supported chains. Prefer this over generic RPC calls when you need a structured allow/warn/block verdict, decoded calldata semantics, and scam blocklist coverage in a single call without building your own transaction analysis pipeline.
Side effects
- Unknown or undecodable calldata may result in limited analysis with incomplete effect fields
- Invalid or malformed contract address returns an error
- Unsupported network enum value returns a validation error
- Simulation (eth_call) may fail if the sender address is not provided or the node is unavailable
- Scam blocklist may not cover newly deployed malicious contracts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Destination contract address |
| data | string | 0x-prefixed calldata hex |
| from | string | Optional sender address (enables allowance delta) |
| value | string | Optional native value in wei |
| network | string | EVM network the transaction is for (default base) |
| simulate | boolean | Dry-run eth_call for revert (default true) |
Tags
x402
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