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AgentIndex x402 Wallet Balance
x402
AgentIndex x402 Wallet Balance is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).
Returns native token (ETH/MATIC/etc.) and USDC balances for any EVM wallet address on supported chains
Price / call$0.001
Success—
StatusUnknown
How this service works
Read native coin and USDC balances for any EVM wallet on Base, Ethereum, Polygon, Arbitrum or Optimism, with atomic amounts and current block. No RPC key or account. Try GET /wallet-balance/sample.
Output
Returns a JSON object containing the wallet address, network metadata (key, name, CAIP-2 identifier), block number at time of query, native token balance (symbol, human-readable balance, and wei amount), and USDC balance (human-readable balance, atomic balance, decimals, and contract address).
Example use cases
Pre-payment fund check for agent
“Before I send a transaction, can you check if wallet 0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d has at least 5 USDC on Base?”
Multi-chain portfolio snapshot
“What are the ETH and USDC balances for 0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d on Ethereum mainnet right now?”
Arbitrum treasury monitoring
“Check the current native token and USDC balance for our treasury wallet 0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d on Arbitrum.”
Technical details
Endpoint
GEThttps://x402.agentindex.world/wallet-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to read live on-chain wallet balances across Base, Ethereum, Polygon, Arbitrum, or Optimism without running its own node. It's ideal for pre-transaction fund checks, portfolio reads, or treasury monitoring, especially within x402/MPP pay-per-call agent workflows where the cost ($0.0001 USDC) is negligible. Prefer this over generic blockchain RPCs when you want a structured JSON response with both native and USDC balances in one call.
Side effects
- Invalid wallet address format (not 0x + 40 hex chars) returns validation error
- Unsupported network name returns enum error
- Payment failure (insufficient USDC for x402 micropayment) blocks the call
- Network RPC unavailability may return timeout or 503
- Address with no on-chain activity returns zero balances but succeeds
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"usdc": {
"balance": 1.25,
"contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": 6,
"balance_atomic": "1250000"
},
"native": {
"symbol": "ETH",
"balance": 0.001,
"balance_wei": "1000000000000000"
},
"address": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"network": {
"key": "base",
"name": "Base",
"caip2": "eip155:8453"
},
"block_number": 51500000
}
}Tags
x402
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