Developer builds KYB agent in 20 lines using pay-per-call API and x402 protocol

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A developer has published a tutorial showing how to build a Know Your Business (KYB) compliance agent in roughly 20 lines of code, using the open x402 protocol that enables AI agents to autonomously pay for API calls via stablecoin authorization. The agent queries Sirenic, a pay-per-call API built on official French and European company registers including INSEE and INPI data, with prices starting at $0.001 per call. When the agent hits an HTTP 402 Payment Required response, it automatically signs a USDC payment and retries the request in a single round-trip without requiring a pre-registered API key. The endpoint consolidates six data sources, returning officer details, VAT numbers, insolvency alerts, sanctions screening, and a completeness score that indicates if any upstream source was unavailable. The same API also functions as an MCP server, allowing tools like Claude and Cursor to access it directly using the same payment mechanism.

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