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EVM Calldata Decoder with Risk Flags
x402
EVM Calldata Decoder with Risk Flags is a paid API for AI agents from evm-canon-base.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Decodes raw EVM calldata into typed function arguments and attaches deterministic risk flags for dangerous patterns like unlimited token approvals and admin actions
Price / call$0.01
Success—
StatusUnknown
How this service works
Decode EVM calldata into typed function args with deterministic risk flags (unlimited approvals, admin actions)
Output
A structured JSON object containing the decoded function name, an array of typed arguments (with names, types, and values), and a set of deterministic risk flags indicating whether the call involves an unlimited approval, an admin/privileged action, or other dangerous patterns.
Example use cases
Wallet safety check before signing
“Before I sign this transaction, decode the calldata 0x23b872dd000000000000000000000000<from>000000000000000000000000<to>000000000000000000000000000000000000000000000000002386f26fc10000 and tell me what function it's calling and whether there are any dangerous flags I should know about.”
Unlimited approval detection in DeFi
“I just got a MetaMask popup — here's the calldata: 0x095ea7b3000000000000000000000000<spender>ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff. Is this an unlimited token approval? Flag any risks.”
Admin action audit on contract call
“Our security tool flagged this calldata from an onchain transaction: 0x8456cb59. Decode it and tell me if it's an admin or privileged action like a pause or ownership transfer.”
Technical details
Endpoint
POSThttps://evm-canon-base.onrender.com/decodeWhen to prefer
Use this endpoint when you need to programmatically decode arbitrary EVM calldata and simultaneously assess its risk profile — especially for wallet safety checks, transaction pre-screening, or DeFi approval audits. Prefer it over a generic ABI decoder when deterministic risk classification (unlimited approvals, admin actions) is required alongside decoding, without having to implement that logic yourself.
Side effects
- Malformed or non-ABI-compliant hex calldata returns a parse error
- Unknown function selector not present in the ABI registry returns a null function name with undecoded args
- Calldata shorter than 4 bytes (no selector) returns an error
- Payment failure or missing x402 header results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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