Contract-code check for a Base mainnet address (is_contract + code size + EIP-77
Contract-code check for a Base mainnet address (is_contract + code size + EIP-7702 delegated-EOA detection).
Asked 10.0x its listed price for its own exampleour last check, 2026-10-19
1 of 1checks answered this week
38 msmedian answer time
$0.001listed 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://x402-data-api.sigrunner.workers.dev/chain/code
| Category | Code and developer |
|---|---|
| Provider host | x402-data-api.sigrunner.workers.dev |
| Networks | eip155:8453 |
| 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 |
|---|---|---|---|---|
| 2026-10-19 | valid payment request | 402 | $0.01 | 38 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"address": "0x4200000000000000000000000000000000000006"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"address": {
"description": "0x-prefixed 20-byte Base address",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"address": {
"type": "string"
},
"chain": {
"type": "string"
},
"code_size_bytes": {
"type": "integer"
},
"delegate_address": {
"type": "null"
},
"is_contract": {
"type": "boolean"
},
"is_eip7702_delegate": {
"type": "boolean"
}
},
"required": [
"address",
"is_contract",
"is_eip7702_delegate",
"delegate_address",
"code_size_bytes",
"chain"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}