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x402 Payment-Gated USDC Wallet Balance Preflight
x402
x402 Payment-Gated USDC Wallet Balance Preflight is a paid API for AI agents from nova5-x402.yesterdays-signal.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).
Checks whether an EVM wallet on Base has sufficient USDC balance to cover a requested payment amount, returning a proceed/fund decision with balance details
Price / call$0.01
Success—
StatusUnknown
How this service works
Live Base wallet intelligence paid with USDC via x402
Output
Returns a JSON object with: the wallet's available USDC balance, remaining USDC after the requested deduction, a boolean 'can_pay' flag, a decision enum of either PROCEED or FUND_USDC, the asset and chain identifiers, the RPC endpoint used, current block number, timestamp, and a list of human-readable reasons explaining the decision.
Example use cases
Pre-payment wallet sufficiency check
“Before charging the user, check if their wallet 0x1234567890abcdef1234567890abcdef12345678 has enough USDC to cover a 0.10 payment — I need to know if they should be prompted to add funds first.”
Agent auto-routing before x402 call
“My agent is about to make an x402-gated API call that costs 0.01 USDC. Can you check if wallet 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef has sufficient balance so I know whether to proceed or ask the user to top up?”
Live balance snapshot for wallet dashboard
“Pull the current USDC balance and payment readiness status for wallet address 0xaabbccddeeff00112233445566778899aabbccdd on Base, assuming we want to make a 0.05 USDC payment.”
Technical details
Endpoint
GEThttps://nova5-x402.yesterdays-signal.workers.dev/x402-preflightWhen to prefer
Use this endpoint when you need a live, on-chain preflight check of an EVM wallet's USDC balance on Base before initiating any payment flow — especially within x402-gated agent pipelines. Prefer this over static balance reads when you need a decision signal (PROCEED vs FUND_USDC) with reasoning, not just a raw balance number. Best suited for automated agent workflows that need to gate downstream actions on payment feasibility.
Side effects
- Invalid or malformed EVM address returns an error or empty result
- Amount field missing or non-numeric causes a validation failure
- RPC node unavailable may cause a timeout or empty block_number
- Wallet with zero USDC returns can_pay: false and decision: FUND_USDC
- Payment for the preflight itself (0.01 USDC) fails if calling agent lacks funds
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| amountrequired | string | Requested USDC payment amount |
| addressrequired | string | EVM wallet address |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| asset | string | |
| chain | string | |
| address | string | |
| can_pay | boolean | |
| network | string | |
| reasons | array | |
| service | string | |
| decision | string | |
| rpc_used | string | |
| timestamp | string | |
| provenance | string | |
| block_number | number | |
| asset_address | string | |
| available_usdc | string | |
| remaining_usdc | string | |
| requested_usdc | string |
Tags
x402
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