# unprice Contract Info Lookup (Base)

> unprice Contract Info Lookup (Base) is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Looks up whether an Ethereum address on Base is a smart contract and returns basic bytecode metadata, paid per-request via USDC on Base using the x402 protocol.

## Facts

- Endpoint: GET https://volkov.evgeny.m2.fvds.ru/pay/contract?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unprice-contract-info-lookup-base-9d675343
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a38OoI_OCdBp5JdEbyOlZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability unprice-contract-info-lookup-base-9d675343
```

Example prompt: Can you check if the address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is a smart contract on the Base network and tell me how big its bytecode is?

## When to prefer this

Choose this endpoint when you need a cheap, pay-per-use check of whether a Base network address is a smart contract without setting up your own RPC node or paying for a premium blockchain API subscription. Ideal for low-volume, on-demand contract verification tasks within AI agent workflows that already use x402/USDC micropayment infrastructure.

## Known failure modes

- Invalid or malformed Ethereum address returns an error or empty result
- Address not found on Base (e.g. typo) may return isContract: false with zero bytecode
- Payment failure via x402 results in HTTP 402 and the request is not fulfilled
- Network timeouts if Base RPC is slow or unavailable
- Missing required 'address' query parameter causes request rejection

## How this service works

Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.

## Output

Returns a JSON object with the queried address, the network name ('base'), a boolean isContract field indicating whether deployed bytecode exists at that address, and the bytecode size in bytes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "address": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "network": "base",
  "isContract": true,
  "bytecodeBytes": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unprice-contract-info-lookup-base-9d675343/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from volkov.evgeny.m2.fvds.ru](https://www.zero.xyz/host/volkov.evgeny.m2.fvds.ru/llms.txt)