Reverse a 4-byte function selector or 32-byte event topic into its signature fro
Reverse a 4-byte function selector or 32-byte event topic into its signature from a built-in list of 120 common token, NFT, DEX and lending signatures.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
298 msmedian answer time
$0.01listed price per call
$0.01price 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://saylorinnovations.com/api/chain/signature-lookup
| Category | Market data |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.01 | 298 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"hash": "0x095ea7b3"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"hash": {
"description": "a 4-byte function selector (0x095ea7b3) or a 32-byte event topic0 (0xddf252ad...)",
"type": "string"
}
},
"required": [
"hash"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"database_size": {
"description": "entries in the built-in list",
"type": "number"
},
"found": {
"description": "true when a signature matched",
"type": "boolean"
},
"hash": {
"description": "the selector or topic looked up",
"type": "string"
},
"kind": {
"description": "function selector or event topic0",
"type": "string"
},
"matches": {
"description": "matching signatures",
"items": {
"properties": {
"kind": {
"description": "function or event",
"type": [
"string",
"null"
]
},
"signature": {
"description": "the matching signature",
"type": [
"string",
"null"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"note": {
"description": "plain-language reading of the result",
"type": "string"
},
"source": {
"description": "where the data was read from or how it was computed",
"type": "string"
}
},
"required": [
"hash",
"kind",
"found",
"matches",
"database_size",
"note",
"source"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}