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First Dollar On-Chain Balance API
x402
First Dollar On-Chain Balance API is a paid API for AI agents from firstdollar-api.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns the on-chain token balance of a given wallet address on the Base blockchain, paid per call via x402.
Price / call$0.02
Success—
StatusUnknown
How this service works
Live Base chain reads sold per call over x402 (exact, USDC on Base, $0.02/call).
Output
Returns the on-chain balance of the specified wallet address on Base, either in the native token or for a specified ERC-20 contract if provided. The response reflects the live state of the blockchain at the time of the call.
Example use cases
DeFi portfolio balance check
“Can you pull the live on-chain balance for my wallet 0x1234567890abcdef1234567890abcdef12345678 on Base, and also check my USDC balance using contract 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA?”
Payment eligibility verification
“Before I process this payout, check if wallet 0xAbCdEf0987654321AbCdEf0987654321AbCdEf09 has any balance on Base — I need to know if it's funded.”
Token airdrop recipient audit
“For each wallet address I give you, look up their current token balance on Base using contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — start with 0xDEAD000000000000000042069420694206942069.”
Technical details
Endpoint
GEThttps://firstdollar-api.onrender.com/balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a live, real-time balance read from the Base blockchain for a specific wallet, especially when paying per-call is acceptable (e.g. spot checks, agent workflows). Prefer this over indexer APIs when you need the most current chain state rather than indexed/historical data, and when Base is specifically the target network.
Side effects
- Invalid or malformed wallet address (0x... format required) returns an error
- Missing required 'address' query parameter returns a 400-level error
- Unrecognized ERC-20 contract address may return zero or an error
- Network issues with Base chain RPC may cause timeouts or stale data
- Payment failure via x402 prevents the call from executing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
Reviews
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