# Base Wallet USDC Readiness Check

> Base Wallet USDC Readiness Check is a paid API for AI agents from x402-wallet-readiness-service.vercel.app, paid per call via x402, $2/call, status unknown (last checked 2026-09-13).

Checks whether a Base network EVM wallet address is ready to receive USDC payments by returning balance, transaction history, and contract status.

## Facts

- Endpoint: GET https://x402-wallet-readiness-service.vercel.app/api/readiness
- Price: $2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-wallet-usdc-readiness-check-3c84c547
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mwM2tG7JULb4DGoLZi9Wl

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 base-wallet-usdc-readiness-check-3c84c547
```

Example prompt: Can you check if the Base wallet 0x820a7bf90d944bb26bfD9b62Ab172Fc3A0829cB9 is ready to receive USDC — tell me its USDC balance, ETH balance, transaction count, and whether it's a contract?

## When to prefer this

Use this endpoint when you need to verify that a Base network wallet is funded and capable of receiving USDC before initiating an x402 payment or agent-to-agent transaction. Ideal for pre-flight checks before sending crypto payments to a new or unknown address, or when onboarding a wallet into an automated payment workflow.

## Known failure modes

- Invalid or malformed EVM address (not matching 0x + 40 hex chars) returns validation error
- Payment not provided or insufficient USDC ($2 required) returns 402 Payment Required
- Wallet address not found on Base returns zeroed balances
- Network timeout or Vercel cold start may delay response
- Rate limiting if too many requests are made in quick succession

## How this service works

Checks Base wallets for USDC receiving readiness, publishes paid x402 data APIs, and sells fixed-price agent payment, developer-tool, VPS, wallet-risk, and QA implementation work.

## Output

Returns a JSON object with the wallet address, network (base), a boolean indicating if it's a contract, the number of token transfers, total transaction count, native ETH balance, and native USDC balance.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "EVM wallet address on Base."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "0x820a7bf90d944bb26bfD9b62Ab172Fc3A0829cB9",
  "network": "base",
  "is_contract": false,
  "token_transfers": 0,
  "transaction_count": 0,
  "native_eth_balance": "0",
  "native_usdc_balance": "0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-wallet-usdc-readiness-check-3c84c547/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-wallet-readiness-service.vercel.app](https://www.zero.xyz/host/x402-wallet-readiness-service.vercel.app/llms.txt)