openclaw-x402-skill

The Skill handles HTTP 402 payment-required responses for autonomous API calls by automatically processing the x402 handshake and generating payment proofs using USDC on Base. It manages the entire pay-per-call execution flow so agents can access endpoints without preconfigured API keys or subscriptions.

Agentic micropayments on Base are pay-per-call USDC transactions that let AI agents autonomously access x402-compatible APIs without preconfigured API keys. The Skill executes the HTTP 402 handshake, verifying payment requirements and transferring funds via an EVM private key with defined spending limits.

To discover and filter MCP tools by price for agent workflows, the Skill searches the x402 Bazaar and applies filters for cost, endpoint type, and keywords. This enables browsing available HTTP and MCP services, inspecting payment requirements, and identifying the cheapest options matching specific task criteria.

Yes, a crypto wallet configured via the EVM_PRIVATE_KEY environment variable is required to execute paid calls with x402 APIs. While service discovery in the x402 Bazaar requires no wallet, completing USDC micropayments on Base for pay-per-call execution requires valid wallet credentials.

You set spending limits for autonomous API micropayments by configuring the MAX_SPEND_PER_CALL guardrail. This prevents unexpected costs during pay-per-call execution by ensuring the agent does not exceed a defined budget threshold when handling the x402 payment handshake on Base.

Yes, x402 endpoints can be used as MCP tools in Claude Desktop and other MCP clients. The Skill exposes x402-compatible APIs as MCP tools, enabling clients to discover and call paid APIs autonomously without manual payment steps by handling the USDC micropayment handshake on Base.