Free static example · no wallet required
Calldata decoder
Inspect the exact response envelope first. When you need current analysis for your own input, one successful x402 call costs $0.001 USDC on Base or Solana.
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Full response envelope
What you receive
Demonstration data only. The paid endpoint returns a fresh result and settlement receipt.
{
"request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
"service": "crypto.calldata-decode",
"version": "1",
"data": {
"function": "transfer",
"signature": "transfer(address,uint256)",
"canonicalSignature": "transfer(address,uint256)",
"signatureSource": "built_in_standard",
"selector": "0xa9059cbb",
"selectorPresent": true,
"inputMode": "selector_and_arguments",
"types": [
"address",
"uint256"
],
"values": [
"0x1111111111111111111111111111111111111111",
42
],
"arguments": [
{
"index": 0,
"type": "address",
"value": "0x1111111111111111111111111111111111111111"
},
{
"index": 1,
"type": "uint256",
"value": 42
}
],
"resolution": {
"method": "built_in_standard",
"signatureProvided": false,
"candidateCount": 1,
"candidates": [
"transfer(address,uint256)"
],
"matchedStandards": [
"ERC-20"
],
"standardReferences": [
{
"standard": "ERC-20",
"url": "https://eips.ethereum.org/EIPS/eip-20"
}
],
"builtInSignatureCount": 29,
"registryComplete": false,
"networkRequestsMade": false,
"version": "apiacre-standard-selectors/1"
},
"warnings": [
"Selector resolution is limited to 29 published standard signatures; four-byte selectors are not globally unique."
],
"encoding": {
"calldataBytes": 68,
"argumentBytes": 64,
"calldataSha256": "f77b5da6ef3efa41f5084d653dc4a135a3978d541db97ce13225bd442b025198",
"argumentsSha256": "d3458da251349437abe3549042a49868dc5528422a63bb815f3e0b46725052c9",
"canonical": true
}
},
"meta": {
"duration_ms": 42,
"cached": false,
"sources": [],
"warnings": [],
"next_actions": []
}
}Example request
Input JSON
{
"calldata": "0xa9059cbb0000000000000000000000001111111111111111111111111111111111111111000000000000000000000000000000000000000000000000000000000000002a",
"input_mode": "auto"
}Delivery contract
One paid POST
Resolve 29 common ERC-20, ERC-165, ERC-721, ERC-1155, ERC-2612, and ERC-3009 selectors without a network lookup, or strictly decode arbitrary Ethereum or EVM calldata using a supplied Solidity signature.
POST /v1/crypto/calldata-decode
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The checkout verifies the request, selected network, USDC asset, recipient, and price before opening a wallet.