Turn a 4-byte function selector or full calldata into its human-readable functio
Turn a 4-byte function selector or full calldata into its human-readable function signature, and (when calldata is present) the decoded argument values. Supply an `abi` for a fully deterministic offline decode, or omit it to look the selector up in public signature registries. Reads with automatic fallback.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
473 msmedian answer time
$0.004listed price per call
$0.004price 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
POST https://chain.openverbs.com/v1/decode
| Category | Everything else |
|---|---|
| Provider host | chain.openverbs.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.004 | 473 ms |
Example input (from the provider)
{
"body": {},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"abi": {
"description": "Optional human-readable signatures, e.g. [\"function transfer(address,uint256)\"], for an exact offline decode.",
"items": {
"type": "string"
},
"type": [
"array",
"string"
]
},
"data": {
"description": "Full calldata hex (selector + arguments).",
"pattern": "^0x[0-9a-fA-F]*$",
"type": "string"
},
"selector": {
"description": "4-byte function selector, e.g. 0xa9059cbb.",
"pattern": "^0x[0-9a-fA-F]{8}$",
"type": "string"
}
},
"required": [],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}