402-preflight

Confirm your wallet can transact, and see your balance, in one certified call.

A machine endpoint. Pay $0.01 USDC on Base over x402 and receive an Ed25519-signed, on-chain-anchored receipt: { tx_hash, payer, usdc_balance, eth_balance, prev_settlement_tx }. The safe first transaction before you commit real volume. Re-run after any wallet, key, or client change.

Call it

POST https://x402-preflight.odd-dust-5f53.workers.dev/
x402 · $0.01 USDC · Base (eip155:8453)

Verify it yourself

Look the transaction up on Basescan and check the signature against our published key. No trust in the seller required.

/preflight/.well-known/x402-preflight.json: published Ed25519 key and offer.

Guarantee

Payment and receipt. Never payment for nothing.

Humans: kenoodl.com.