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x402 is an open payment protocol that brings blockchain payments into the HTTP standard. By reusing the HTTP 402 Payment Required status code, it lets developers handle onchain and agentic payments with the same tools they already use for APIs and web services. Instead of building complex wallet integrations or subscription systems, developers can treat payments like any other part of the HTTP request/response cycle. This approach works for web2 developers experimenting with paid APIs and for web3 builders who need a lightweight way to support pay-per-use APIs, agent-to-agent transactions, and micropayments. Read more about x402 here.

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Access on Polygon

Polygon supports x402 v2 on mainnet and Amoy through the following facilitators:
  1. Polygon Mainnet Facilitator: https://x402.polygon.technology
  2. Polygon Amoy Facilitator: https://x402-amoy.polygon.technology
Both Polygon facilitators run x402 v2. Use the @x402/* packages in the Quickstart for Buyers and Quickstart for Sellers. Upgrading from V1? See Migration: V1 to V2.
Additional facilitators compatible with Polygon: To implement x402 with Polygon and your applications or agents, follow the tutorials and guides in these docs. Alternatively, the x402 community has created multiple examples which can be adapted for Polygon.