Use an x402 v2 client with the OpenAPI specification. An unpaid call returns HTTP 402 and the payment requirements. Successful paid calls return the result and a payment receipt. For simple GET clients, the same endpoint accepts the JSON request as the URL-encoded input query parameter.
Every result is checked against its documented contract. Requests have strict size and execution limits. Use non-sensitive data: request content is processed in memory and is not kept in application logs. Payment references and an input hash are retained to prevent duplicate charges.
Receiving wallet: 0xc1930Fc0dEda059095C32e7D48CC5C3c870E5101. This is an experimental service. Examples use fixed sample data; service availability and sales are separate facts.