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Bot Bazaar EVM Function Selector Lookup
x402
Bot Bazaar EVM Function Selector Lookup is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Look up EVM function names from 4-byte hex selectors, or compute a selector hash from an ABI function signature.
Price / call$0.01
Success—
StatusUnknown
How this service works
Identify 4-byte EVM function selectors (transfer, approve, transferWithAuthorization, balanceOf) or compute selector from an ABI signature.
Output
Returns the human-readable function name and full ABI signature matching the given 4-byte selector, or computes the selector hex value from a provided ABI signature string. Covers common ERC-20 functions including transfer, approve, transferWithAuthorization, and balanceOf.
Example use cases
Decode unknown calldata prefix
“I'm inspecting an Ethereum transaction and the calldata starts with 0x23b872dd — can you look up what EVM function that selector belongs to?”
Verify token approval selector
“What's the 4-byte selector for the ERC-20 approve(address,uint256) ABI signature? I want to confirm I'm encoding it correctly in my contract calls.”
Identify balanceOf selector in audit
“During a smart contract audit I found a call with selector 0x70a08231 — can you decode what function that is?”
Technical details
Endpoint
GEThttps://bot-bazaar.fly.dev/v1/x402/selector-lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to decode 4-byte function selectors from raw Ethereum transaction calldata, or when you need to verify the canonical selector hash for a known ERC-20 ABI signature. It is purpose-built for EVM smart contract function identification and is more lightweight than spinning up a full ABI decoder or querying Etherscan's API for the same purpose.
Side effects
- Selector not found in known database — returns null or 404 for obscure custom functions
- Malformed selector format (missing 0x prefix or wrong byte length) causes validation error
- Invalid ABI signature syntax prevents selector computation
- Network timeout or service unavailability on fly.dev host
- Payment not fulfilled (x402 402 response) if USDC not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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