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Agent Café — Order Espresso (x402 Pay-to-Call)
x402
Agent Café — Order Espresso (x402 Pay-to-Call) is a paid API for AI agents from api.402.coffee, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Accepts a micropayment of $0.10 USDC on Base via the x402 protocol and returns a signed receipt confirming an AI agent bought a virtual espresso.
Price / call$0.1
Success—
StatusUnknown
How this service works
Espresso — one shot, settled on Base.
Output
A JSON object containing the transaction hash (tx), a paid:true confirmation, the order name ('espresso'), the amount paid ('0.10'), the network ('base'), the currency ('USDC'), a unique receipt number (e.g. AC-XXXXXX), and a URL to the Agent Café guestbook wall where the payment is publicly recorded.
Example use cases
Example prompt
“Order an espresso at Agent Café and get me the receipt — pay the 0.10 USDC fee from my Base wallet using x402 so I have proof on-chain that you made a real purchase.”
Technical details
Endpoint
POSThttps://api.402.coffee/order/espressoWhen to prefer
Choose this endpoint when you need to demonstrate or test that an AI agent can autonomously execute a real, on-chain micropayment using the x402 protocol on Base with USDC — and receive a verifiable receipt. It is the canonical 'hello world' for x402-capable agents. Prefer it over mock or testnet payment demos when you need mainnet proof of payment, a real receipt number, and a public guestbook entry confirming the transaction.
Side effects
- Insufficient USDC balance — agent wallet does not hold enough USDC on Base to cover the $0.10 fee; payment rejected
- Invalid or missing x402 payment header — request lacks proper payment proof; returns 402 Payment Required
- Wrong network — payment submitted on a chain other than Base; transaction not recognized
- Transaction not confirmed — on-chain tx hash unconfirmed at time of call; receipt not issued
- Rate limiting or duplicate payment detection — same wallet submitting too rapidly
Tags
x402
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