What is pay-for-service?
Access paid API endpoints and content using the x402 payment protocol. Use when you or the user want to call a paid API, access gated content, make an x402 payment, use a paid service, or retrieve content that requires payment. Covers "fetch this paid resource", "access x402 content", "pay for this API call". Source: financedistrict-platform/fd-agent-wallet-skills.