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Calldata Selector and 32-Byte Word Splitter
x402
Calldata Selector and 32-Byte Word Splitter is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-30).
Splits raw EVM calldata hex into its 4-byte function selector and individual 32-byte ABI-encoded word chunks
Price / call$0.002
Success—
StatusUnknown
How this service works
Split calldata into its selector and 32-byte words — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok:true, the type field set to 'calldata-split', the parsed 4-byte function selector, and an array of 32-byte ABI word slots extracted from the calldata. Also includes a receipt with the transaction hash, USD amount charged, and a receipt ID for payment verification.
Example use cases
Debugging a failed contract call
“I have this raw calldata from a failed transaction and I need to see what function was called and what each parameter was — can you split 0x23b872dd000000000000000000000000sender000000000000000000000000receiver00000000000000000000000000000000000000000000000000000000000003e8 into its selector and 32-byte word slots?”
Inspecting a pending mempool transaction
“There's a suspicious pending transaction in the mempool with this input data: 0x095ea7b3000000000000000000000000spender00000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff — break it apart into the function selector and individual 32-byte chunks so I can see what it's approving.”
Smart contract audit calldata review
“During my audit I grabbed this raw calldata from a contract interaction: 0x40c10f190000000000000000000000001234567890abcdef1234567890abcdef1234567800000000000000000000000000000000000000000000003635c9adc5dea00000 — split it into the 4-byte selector and each 32-byte word so I can verify the function and arguments.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/calldata-split?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call decomposition of raw EVM calldata into its ABI components without running a local ABI decoder. Ideal for agents inspecting transaction inputs, debugging smart contract calls, or auditing calldata on the fly without needing the full ABI definition — particularly useful in pipelines where you already have other UnyKorn EVM tools (receipt lookup, ABI encoding, ENS resolution) and want a consistent x402 micropayment flow.
Side effects
- Invalid or non-hex calldata string returns an error
- Calldata shorter than 4 bytes (missing selector) may fail parsing
- Payment failure or insufficient x402 funds blocks the request
- Malformed 0x prefix or odd-length hex string rejected by schema pattern
- Network timeout if the UnyKorn node is unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "calldata-split",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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