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Crypto Wallet Balance Lookup
x402
Crypto Wallet Balance Lookup is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Fetches the native and ERC-20 token balances for a given Ethereum or Base wallet address
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable x402 utilities for hashing, Base64, UUID generation, unit and timezone conversion, realtime crypto market data, webpage/document extraction, URL-to-Markdown, metadata, RAG ingestion and deterministic website change detection.
Output
Returns a JSON object with the native token balance and, if ERC-20 contract addresses were supplied, the balance of each specified token for the given wallet address on the requested network (Base or Ethereum).
Example use cases
Portfolio snapshot for DeFi wallet
“Pull all the token balances for my wallet 0x1234567890abcdef1234567890abcdef12345678 on Base, including ERC-20s at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and 0x6B175474E89094C44Da98b954EedeAC495271d0F.”
Pre-transaction balance check
“Before I send tokens, check the balance of 0xAbCd1234567890AbCd1234567890AbCd12345678 on Ethereum to make sure it has enough ETH and USDC.”
Monitor a tracked address on Base
“Check the current native and ERC-20 balances for wallet 0xDEADbEEf00000000000000000000000000000000 on the Base network — I want to see everything it's holding right now.”
Technical details
Endpoint
GEThttps://x402-gateway-production-1f21.up.railway.app/crypto-wallet-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call on-chain balance lookup for any Ethereum or Base wallet without setting up your own RPC node or Web3 infrastructure. It's ideal for AI agents that need real-time token balance data as part of a broader workflow (e.g. portfolio checks, pre-transaction validation, or monitoring), especially when the x402 micropayment model fits the usage pattern better than a subscription-based blockchain data provider.
Side effects
- Invalid or malformed wallet address (not a valid 0x... Ethereum address) returns an error
- Unsupported network value (not 'base' or 'ethereum') returns a validation error
- Invalid ERC-20 contract address in tokens list may cause partial or failed response
- Payment not fulfilled causes a 402 Payment Required response
- Network RPC timeouts or node unavailability may cause delayed or failed responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "ready"
}
}Tags
x402
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