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x402 Base USDC/ETH Lookup
x402
x402 Base USDC/ETH Lookup is a paid API for AI agents from x402-lookup-seller.fly.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Verifies a Base chain USDC payment transaction or checks the ETH and USDC balances of a wallet address before retrying a payment.
Price / call$0.002
Success—
StatusUnknown
How this service works
Base transaction status and USDC balance checks for settlement verification. Pass exactly one of hash= (or tx=) for a Base tx receipt with usdcIn/usdcOut, or address= for ETH+USDC balances and recent USDC transfers. Use when verifying a Base USDC payment or checking a wallet before retry.
Output
Returns the status of a Base chain transaction (confirmed, pending, failed, not found) when queried by tx hash, or the current ETH and USDC balances of a wallet address when queried by address — enabling agents to verify payments or assess funds before retrying.
Example use cases
Confirm USDC payment before fulfilling order
“The user says they paid via Base USDC — can you verify transaction 0x9f3a2e...b7c801 actually went through on Base so I can confirm their order?”
Check wallet balance before retrying x402 payment
“Before I retry the payment, can you check whether wallet address 0xDeAdBeEf...1234 has enough ETH and USDC on Base to cover it?”
Debug a failed payment flow
“My x402 payment attempt failed — can you look up transaction 0x00fa12...cc9d to see what status it has on Base so I know if I need to retry or if it went through?”
Technical details
Endpoint
GEThttps://x402-lookup-seller.fly.dev/v1/base/statusWhen to prefer
Use this endpoint when you need to verify a Base chain USDC payment by transaction hash or check wallet balances (ETH + USDC on Base) before deciding whether to retry an x402 payment. Prefer this over generic block explorers when the agent needs a structured, machine-readable response rather than a human-readable page, and when the use case is specifically Base chain USDC payment verification.
Side effects
- Invalid tx hash format (not 0x + 64 hex) returns an error
- Invalid address format (not 0x + 40 hex) returns an error
- Providing both tx and address simultaneously is rejected (mutually exclusive)
- Providing neither tx nor address returns a validation error
- Transaction not yet indexed may return not-found temporarily
- Network or node unavailability may cause timeouts
Tags
x402
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