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Plainchain Wallet Balances API
x402
Plainchain Wallet Balances API is a paid API for AI agents from plainchain.appin60.com, paid per call via x402, $0.001942/call, status unknown (last checked 2026-10-14).
Returns native ETH and ERC-20 token balances (with USD values) for a given wallet address on Base, Arbitrum, Ethereum, or Optimism
Price / call$0.001942
Success—
StatusUnknown
How this service works
Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.
Output
A JSON object containing the chain name, native ETH balance with symbol and USD value, an array of ERC-20 token balances each with token address, symbol, balance, and USD value, the queried address, and a totalUsd figure summing all holdings.
Example use cases
Pre-transaction balance check
“Before I send that payment, can you check how much ETH and USDC wallet 0x1234...abcd has right now on Base so I know if there's enough to cover it?”
DeFi portfolio snapshot
“Give me a full breakdown of all token balances and their USD values for address 0xDEAD...BEEF on Arbitrum — I want to see ETH plus any ERC-20s.”
Multi-token wallet monitoring
“Check the wallet 0xaaaa...bbbb on Ethereum and include balances for these extra tokens: 0x6b17...1d0f and 0x2260...1e0c — I need the USD totals for each.”
Technical details
Endpoint
GEThttps://plainchain.appin60.com/v1/balances?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call (no API key) multi-token balance snapshot for a wallet on Base, Arbitrum, Ethereum, or Optimism with USD values included. Prefer it over free RPCs when you need USD-denominated totals without doing your own price lookups, and when operating in an x402-compatible agent that can pay micro-amounts in USDC on Base.
Side effects
- Invalid or malformed wallet address (must match 0x + 40 hex chars) returns an error
- Unsupported chain identifier returns an error
- Invalid extra token address in 'tokens' parameter causes lookup failure
- Insufficient USDC payment via x402 results in 402 Payment Required response
- Network/RPC issues on the target chain may cause timeouts or partial data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "Base",
"native": {
"usd": 31.08,
"symbol": "ETH",
"balance": "0.0123"
},
"tokens": [
{
"usd": 152.4,
"token": "0x8335...",
"symbol": "USDC",
"balance": "152.4"
}
],
"address": "0x...",
"totalUsd": 183.48
}
}Tags
x402
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