Inspect a token or any address on Base mainnet
Inspect a token or any address on Base mainnet: contract vs EOA (incl. EIP-7702 delegation), bytecode size, ERC-20 name/symbol/decimals/totalSupply (raw and formatted; bytes32 symbols handled), proxy implementation (EIP-1967, beacon, ZeppelinOS/FiatToken), whether it is a well-known Base token (guards against spoofed symbols), and optionally the balance of `holder`. Read live from public Base RPC; metadata cached 1 h. All params optional: defaults to USDC on Base. Invalid input = 400, never...
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://quickbuild.quynguyenbac.workers.dev/api/base/token
| Category | Market data |
|---|---|
| Provider host | quickbuild.quynguyenbac.workers.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.002 | 32 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"address": {
"description": "Token / contract address on Base (0x + 40 hex). Optional: defaults to USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.",
"type": "string"
},
"holder": {
"description": "Optional address whose balance of this token to include.",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"accountType": {
"type": "string"
},
"address": {
"type": "string"
},
"codeSizeBytes": {
"type": "integer"
},
"decimals": {
"type": [
"integer",
"null"
]
},
"holder": {
"type": "object"
},
"isContract": {
"type": "boolean"
},
"isErc20": {
"type": "boolean"
},
"name": {
"type": [
"string",
"null"
]
},
"proxy": {
"type": [
"object",
"null"
]
},
"symbol": {
"type": [
"string",
"null"
]
},
"totalSupply": {
"properties": {
"formatted": {
"type": [
"string",
"null"
]
},
"raw": {
"type": "string"
}
},
"type": [
"object",
"null"
]
},
"wellKnown": {
"type": "boolean"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}