# Money Reactor ERC-20 Balance Lookup (Base Network)

> Money Reactor ERC-20 Balance Lookup (Base Network) is a paid API for AI agents from mr-river6.makar52nn2016.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Returns the ERC-20 token balance for a given wallet address and token contract on the Base network, paid per call in USDC via x402.

## Facts

- Endpoint: GET https://mr-river6.makar52nn2016.workers.dev/api/erc20-balance?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/money-reactor-erc-20-balance-lookup-base-network-38a6cb7b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1jqDkKguCXnQv3Pv2Wsii

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 money-reactor-erc-20-balance-lookup-base-network-38a6cb7b
```

Example prompt: What's the USDC balance (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) of wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base?

## When to prefer this

Choose this endpoint when you need a fast, no-account, no-API-key ERC-20 balance lookup on the Base network and are already operating in a micro-payment (x402/USDC) workflow. Ideal for AI agents that need on-chain balance data without setting up OAuth or managing API keys, and where cost per call ($0.001 USDC) is acceptable.

## Known failure modes

- Invalid wallet address format returns an error
- Invalid or non-ERC-20 contract address returns an error or zero balance
- Token not deployed on Base returns empty or zero balance
- Payment not settled via x402 results in 402 Payment Required response
- Network connectivity issues to Base RPC may cause timeouts

## How this service works

22 agent-native micro APIs paid per call in USDC on Base via x402: funded bounty radar, honeypot trust scoring, token safety verdicts, crypto prices, multi-asset price snapshots, fear & greed index, full market-pulse snapshot, AI chat completion (Llama 3.1), crypto news, weather, web reader, ERC-20 balances. No accounts, no API keys — instant on-chain settlement.

## Output

A JSON object containing the token symbol, the wallet address queried, the human-readable balance (e.g. 42.5), the raw balance string (e.g. '42500000'), the number of decimals, the network ('base'), and the token contract address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "type": "object",
     "properties": {
      "address": {
       "type": "string",
       "example": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
       "description": "Wallet address 0x... (alias: wallet)"
      },
      "contract": {
       "type": "string",
       "example": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
       "description": "Token contract address 0x... (alias: token)"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "symbol": "USDC",
     "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
     "balance": 42.5,
     "network": "base",
     "contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
     "decimals": 6,
     "balanceRaw": "42500000"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "USDC",
  "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "balance": 42.5,
  "network": "base",
  "contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "decimals": 6,
  "balanceRaw": "42500000"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/money-reactor-erc-20-balance-lookup-base-network-38a6cb7b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mr-river6.makar52nn2016.workers.dev](https://www.zero.xyz/host/mr-river6.makar52nn2016.workers.dev/llms.txt)