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DevX Agent Tools – Multichain USDC Balance Checker
x402
DevX Agent Tools – Multichain USDC Balance Checker is a paid API for AI agents from devx-x402-tools.nextill-pos.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Returns USDC and native token balances for a crypto address across one or more EVM/Solana chains, paid per-call via x402 USDC on Base.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call utilities for AI agents, no API key or signup: read any web page as clean Markdown ($0.002), link/SEO metadata ($0.001), domain DNS + SPF/DMARC email-security audit ($0.003), ERC-20 token safety pre-check ($0.005), crypto address validation, on-chain payment verification, EIP-681/BIP21/Solana Pay payment requests with QR, multichain USDC balances ($0.01). x402 v2, USDC on Base. Invalid input / upstream failure is never charged.
Output
Returns a JSON object with the queried address and an array of balance entries per chain, each containing USDC balance (decimal), native token balance (decimal), chain name, native token symbol, and a boolean indicating whether the address is a smart contract.
Example use cases
Pre-payment wallet balance check
“Before I send this invoice payment, check how much USDC the address 0x4f3edf983ac636a65a842ce7c78d9aa706d3b113 has on Base and Polygon so I know if they can cover it.”
DeFi portfolio balance snapshot
“Pull the USDC and ETH balances for my wallet 0x1234abcd5678ef90 across Base, Arbitrum, and Optimism so I can see where my funds are sitting.”
Agent treasury monitoring
“Check how much USDC is in the agent treasury wallet 0xdeadbeef00000000000000000000000000000001 on Base right now — I need to know if it needs topping up.”
Technical details
Endpoint
GEThttps://devx-x402-tools.nextill-pos.workers.dev/v1/wallet/balances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, keyless, pay-per-call multichain USDC and native balance lookup without setting up your own RPC infrastructure. Ideal for AI agents that need to verify wallet solvency, monitor treasury balances, or audit addresses across multiple chains in a single call. Prefer over self-hosted RPC solutions when low operational overhead matters and call volume is moderate.
Side effects
- Invalid or malformed wallet address returns an error without charge
- Unsupported chain identifier returns an error
- Upstream RPC node unavailability may cause a failed response without charge
- Address with no activity may return zero balances but still succeeds
- Malformed query parameters result in a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"address": "0x...",
"balances": [
{
"usdc": 12.5,
"chain": "base",
"native": 0.01,
"is_contract": false,
"native_symbol": "ETH"
}
]
}
}Tags
x402
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