# Oblique Markets Base USDC Balance

> Oblique Markets Base USDC Balance is a paid API for AI agents from api.oblique.markets, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns the live USDC balance of any Base mainnet wallet address by calling balanceOf on the canonical USDC contract

## Facts

- Endpoint: GET https://api.oblique.markets/api/v1/paid/base-usdc-balance
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/oblique-markets-base-usdc-balance-f4be8473
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zwgmk9mTBV5Rs-WHlHBoW

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 oblique-markets-base-usdc-balance-f4be8473
```

Example prompt: What's the current USDC balance for the Base mainnet wallet 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97?

## When to prefer this

Choose this endpoint when you need a fast, trustless, real-time read of a specific wallet's USDC balance on Base mainnet without running your own node. Ideal for agents that need to verify stablecoin liquidity before executing transactions, for portfolio monitoring, or for any workflow that requires on-chain USDC balance data on Base. Prefer over general blockchain explorers when you need a simple, cost-effective, API-accessible balance check with no setup.

## Known failure modes

- Invalid or malformed EVM address (not matching ^0x[0-9a-fA-F]{40}$) returns a 400 or validation error
- Address with zero USDC returns a valid response with balance of 0, not an error
- RPC node downtime across redundant providers could cause temporary unavailability
- Payment failure (insufficient x402 USDC) results in a 402 Payment Required response
- Querying a non-Base-mainnet address (e.g., Ethereum mainnet address) will still return a result but may show 0 if the address holds no Base USDC

## How this service works

Use when an agent needs base usdc balance. Returns Check a Base wallet’s USDC balance on the canonical Base USDC contract and return structured JSON with atomic and formatted values. $0.003.

## Output

Returns the live USDC balance of the queried Base mainnet address, read directly from the canonical USDC contract's balanceOf function. The balance is expressed in USDC's native 6-decimal format (i.e., divide by 1,000,000 to get the human-readable amount). Data is sourced from redundant public RPCs for reliability.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "EVM address, 0x-prefixed 40 hex chars"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "as_of": {
     "type": "string"
    },
    "address": {
     "type": "string"
    },
    "balance_usdc": {
     "type": "string"
    },
    "balance_atomic": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "as_of": "2026-08-10T12:00:00.000Z",
  "address": "0x4200000000000000000000000000000000000006",
  "balance_usdc": "1523.400000",
  "balance_atomic": "1523400000"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/oblique-markets-base-usdc-balance-f4be8473/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.oblique.markets](https://www.zero.xyz/host/api.oblique.markets/llms.txt)