Contract introspection on Base mainnet
Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.
Answeringour last check, 2026-10-10
1 of 1checks answered this week
886 msmedian answer time
$0.005listed price per call
$0.005price 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://x402.agentindex.world/base/contract
| Category | Everything else |
|---|---|
| Provider host | x402.agentindex.world |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.005 | 886 ms |
Example input (from the provider)
{
"body": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"address": {
"title": "Address",
"type": "string"
}
},
"required": [
"address"
],
"title": "AddressInput",
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"address": {
"title": "Address",
"type": "string"
},
"bytecode_size": {
"title": "Bytecode Size",
"type": "integer"
},
"is_contract": {
"title": "Is Contract",
"type": "boolean"
},
"is_proxy": {
"title": "Is Proxy",
"type": "boolean"
},
"owner": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Owner"
}
},
"required": [
"address",
"is_contract",
"bytecode_size",
"owner",
"is_proxy"
],
"title": "ContractOutput",
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}