Blog

Payments for the agentic web,explained.

Guides and deep-dives on x402, charging AI agents per API call in USDC, and shipping monetised APIs with one drop-in middleware.

2026-05-22 · 2 min read

x402 developer integration guide: add pay-per-call to your API in ~5 minutes

The end-to-end path for developers: register a monetised route, grab a test key, add one middleware, go live. Pick the official SDK for your stack — nine of them, one frozen contract.

Read

2026-05-20 · 2 min read

How Paywall charges AI crawlers for site owners (the Cloudflare-edge path)

Connect Cloudflare, write a pricing rule, and AI crawlers get quoted a price instead of taking your content for free — decided at the edge, before your origin, with humans untouched and no code changes.

Read

2026-05-18 · 3 min read

x402 technical deep dive: the X402v1 wire contract, signing, and the request flow

How x402 works under the hood: the frozen X402v1 canonical string, HMAC-SHA256 request signing, the challenge/verify flow, fail-closed semantics, and byte-identical SDK conformance.

Read

2026-05-15 · 3 min read

What is x402? Getting paid when software uses your site or API

Plain-English explainer: x402 lets websites and APIs charge automated visitors (AI agents and crawlers) a small amount per request — no invoices, no crypto knowledge needed.

Read