x402

The x402 skill provides a command-line workflow for discovering and interacting with paid API services that use the X402 payment protocol. It enables users to search a marketplace of paid endpoints, inspect payment requirements before making a request, and execute API calls with automatic USDC payments on the Base network. This skill is designed for situations where there is no predefined integration available or when users need to explore external paid services dynamically. By combining service discovery, payment inspection, and request execution into a single workflow, the skill simplifies access to monetized APIs and reduces the complexity of handling blockchain-based payments manually.

The skill includes several core capabilities centered around the `npx [email protected] x402` command set. Users can search the bazaar using keyword-based vector search, filter services by blockchain network, payment scheme, price, payment asset, or extension type, and browse all indexed resources. The `details` command allows inspection of endpoint payment requirements without initiating a payment, including supported HTTP methods, pricing information, accepted payment schemes, network details, and available input or output schemas. The `pay` command supports making authenticated paid API requests with configurable HTTP methods, JSON request bodies, query parameters, headers, maximum payment limits, and correlation identifiers for grouped operations.

This skill is useful for developers, AI agents, API consumers, and technical users who need access to paid APIs without building custom payment integrations. Common use cases include discovering third-party AI or data services, testing paid endpoints, automating blockchain-based API consumption, and integrating monetized APIs into agent workflows. It is especially relevant for users working with decentralized payment systems, programmable API marketplaces, or blockchain-enabled service ecosystems.