Function selector and event topic hash from a signature such as Transfer(address
Function selector and event topic hash from a signature such as Transfer(address,address,uint256): 4-byte id and 32-byte keccak256, computed locally.
Not tested: has real-world effectsour last check, 2026-10-21
0 of 0checks answered this week
n/amedian answer time
$0.01listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/chain/signature-hash
| Category | Everything else |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"signature": "Transfer(address,address,uint256)"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"signature": {
"description": "a function, event or error signature with types only, for example Transfer(address,address,uint256)",
"type": "string"
}
},
"required": [
"signature"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"error_selector": {
"description": "first 4 bytes, used for custom errors",
"type": "string"
},
"event_topic0": {
"description": "full 32-byte hash for event logs",
"type": "string"
},
"function_selector": {
"description": "first 4 bytes of the keccak256 hash",
"type": "string"
},
"known_function": {
"description": "matching common function if any",
"type": [
"string",
"null"
]
},
"note": {
"description": "plain-language reading of the result",
"type": "string"
},
"signature": {
"description": "the normalised signature hashed",
"type": "string"
},
"source": {
"description": "where the data was read from or how it was computed",
"type": "string"
}
},
"required": [
"signature",
"function_selector",
"event_topic0",
"note",
"source"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}