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EVM Transaction Pre-Sign Safety Screener
x402
EVM Transaction Pre-Sign Safety Screener is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Decodes and risk-scores a raw EVM transaction before signing — checking calldata, approval deltas, scam blocklists, and revert risk — returning allow/warn/block 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 structured JSON object with a top-level verdict of allow, warn, or block; a numeric risk score from 0 to 100; decoded calldata intent (function name, known pattern); approval delta and transfer target if applicable; revert status from dry-run simulation; and a list of risk indicators such as scam-blocklist hits or approval-hygiene flags. Does not constitute financial or legal advice.
Example use cases
Approve token before DeFi deposit
“I'm about to approve USDC spending to a Uniswap router on Base — the calldata is 0x095ea7b3 with max approval. Screen it first and tell me the risk score and whether the approval target looks clean.”
Catch drain transaction in wallet agent
“My agent wants to submit this raw transaction on Arbitrum: to 0xDEAD...BEEF, data 0x23b872dd, from my wallet 0xABC...123. Can you check if this is a scam or a legitimate transfer before it goes out?”
Verify a DeFi swap won't revert
“Check whether this swap calldata on Polygon will revert before I broadcast it — to is 0x1111...2222, data is 0xe449022e..., value is 0. Simulate the eth_call and give me the safety verdict.”
Technical details
Endpoint
POSThttps://api.agentstools.dev/tx/rawWhen to prefer
Use this endpoint when an AI agent or wallet needs a pre-submission safety gate for raw EVM transactions — especially for DeFi interactions, token approvals, or any transaction received from an external source. Prefer this over generic contract explorers when you need a machine-readable allow/warn/block verdict with a numeric risk score, approval delta analysis, and revert simulation in a single call. It is particularly valuable in agentic workflows where the agent must autonomously decide whether to proceed with a transaction without human review.
Side effects
- Invalid or non-0x-prefixed calldata returns a decode error
- Unknown contract address not in signature registry results in unrecognized calldata label
- Unsupported network enum value returns a validation error
- Simulation failure if the node is unreachable or the block state is stale
- Missing required 'to' field returns 400 bad request
- High-latency response if the target network RPC is congested
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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