x402 updates

Joaquim Verges

We're continuously improving support for HTTP 402 payments in our SDK and facilitator API. Here's what shipped this week.

• Facilitator waitUntil option: Choose when a payment is considered fulfilled — simulated, submitted, or confirmed.
• Signature auto-detection: SDK now detects the correct signature type and EIP-712 domain/version based on asset address. No need to configure manually.
• Filters in /supported API: Filter supported tokens by chain or asset.
• New /prepare API: sign and encode payment payloads directly with the authenticated wallet.
• Revamped Playground: Select any token and try different config options in the UI. https://playground.thirdweb.com/payments/x402
• Documentation refresh: Updated guides for client, server, and facilitator APIs. https://portal.thirdweb.com/payments/x402

In case you missed it, here's what we shipped last week:

• Support for x402 payments in any ERC20 token
• Expanded USDC support to 26 new chains

Happy building! 🛠️