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Solidity ABI Calldata Decoder
x402
Solidity ABI Calldata Decoder is a paid API for AI agents from chain-tools.use.x402atlas.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Decodes canonical EVM smart-contract function call data or typed ABI values, verifies selectors, and rejects ambiguous offsets or padding.
Price / call$0.005
Success—
StatusUnknown
How this service works
Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.
Output
Returns the decoded parameter values for each argument in the function call, the verified function selector, and any validation errors if the calldata contains ambiguous offsets, bad padding, or mismatched types. If decoding fails strict validation, the endpoint returns a structured rejection explaining the violation.
Example use cases
Decode suspicious transaction calldata
“I have raw calldata from a transaction that interacted with a DeFi contract — can you decode it against the function signature `swapExactTokensForTokens(uint256,uint256,address[],address,uint256)` and tell me what arguments were passed? Here's the hex: 0x38ed1739...”
Verify contract interaction arguments
“I need to verify that this calldata was actually encoding an `approve(address,uint256)` call with the expected spender address and amount — can you decode it and flag any padding anomalies? Calldata: 0x095ea7b3...”
Audit smart contract function call
“As part of a security audit, decode this raw hex calldata against the signature `execute(address,uint256,bytes)` and confirm the selector is correct and there are no ambiguous offsets: 0x1cff79cd...”
Technical details
Endpoint
POSThttps://chain-tools.use.x402atlas.com/evm/abi-decodeWhen to prefer
Use this endpoint when you need strict, canonical ABI decoding that goes beyond basic hex parsing — especially when security or correctness matters, such as auditing transactions, validating contract interactions, or verifying that calldata has no ambiguous offsets or non-standard padding. Prefer this over generic hex decoders when you need selector verification and strict rejection of malformed encodings.
Side effects
- Calldata does not match the provided function signature — returns a decoding error
- Invalid or mismatched selector — returns selector mismatch error
- Ambiguous dynamic offsets detected — rejected with strict validation error
- Malformed hex input — returns a parse error
- Padded zeros in unexpected positions — rejected as non-canonical encoding
Tags
x402
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