Function signatures for a 4-byte selector, and for calldata the decoded argument
Function signatures for a 4-byte selector, and for calldata the decoded arguments. Signatures come from the openchain.xyz database, with 4byte.directory as fallback. Calldata is decoded against each candidate until one fits the selector and the arguments; bigints are returned as strings. Read-only.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
30 msmedian answer time
$0.002listed price per call
$0.002price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.sitecheck-api.workers.dev/api/evm/decode
| Category | Everything else |
|---|---|
| Provider host | api.sitecheck-api.workers.dev |
| Networks | eip155:5042, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.002 | 30 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"data": "0xa9059cbb000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045000000000000000000000000000000000000000000000000000000000000000a"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"data": {
"description": "Calldata, 0x followed by hex (at least 4 bytes)",
"type": "string"
},
"selector": {
"description": "Or only the selector: 0x followed by 8 hex characters",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}