Profile a Base address in one call instead of four to six lookups
Profile a Base address in one call instead of four to six lookups. Returns contract or externally owned plus code size, proxy detection across all seven slot layouts including the legacy OpenZeppelin slot Base USDC uses, the resolved implementation, ERC-165 and behavioural ERC-20 detection, token metadata, requested ERC-20 balances, and denylist hits. Answers unknown rather than guessing, and null rather than false when a contract stays silent. Not a guarantee that an address is safe.
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://chainstate.schemasure.com/v1/chain/state
| Category | Code and developer |
|---|---|
| Provider host | chainstate.schemasure.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 9 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 | $0.01 | 1029 ms |
Example input (from the provider)
{
"body": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"address": {
"description": "The Base address to profile. Case-insensitive; normalised to EIP-55.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"selector": {
"description": "Only used for EIP-2535 diamonds, which have no single implementation and resolve their executing code per selector. Ignored for every other proxy kind.",
"pattern": "^0x[0-9a-fA-F]{8}$",
"type": "string"
},
"tokens": {
"description": "ERC-20 contracts to read balanceOf(address) on for the subject. Amounts come back in base units with the token's decimals, or null with a reason.",
"items": {
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"maxItems": 10,
"type": "array"
}
},
"required": [
"address"
],
"title": "ChainStateRequest",
"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"
},
"output": {
"properties": {
"example": {
"properties": {
"result": {
"required": [
"address",
"account",
"proxy",
"interfaces",
"token",
"balances",
"unresolved"
],
"type": "object"
},
"verdict": {
"description": "Precedence: block, then unknown, then warn, then allow.",
"enum": [
"allow",
"warn",
"block",
"unknown"
],
"type": "string"
}
},
"required": [
"ok",
"verdict",
"risk_codes",
"evidence",
"result",
"request_hash"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}