Build an x402 client

Take the user from nothing to one successful paid API call: resolve a CDP-managed wallet, wrap their HTTP client so it answers 402 automatically, fund the wallet on testnet, verify with a 200.

Resolve the Decisions table below before writing any code, then read only the language subsection you resolved to in step 3. This file covers TypeScript and Python; reading both will blend them.

When not to use this skill