OnchainKit

Onchain Kit incorporates XMTP payloads

Official Docs: Official Onchain Kit documentation.
Quickstart: Onchain Kit quickstart that integrates XMTP.

Metadata

First add the metadata indicating which protocols you support.

const frameMetadata = getFrameMetadata({
  /**
   * Frame metadata like image, buttons, input, etc.
   */
  isOpenFrame: true,
  accepts: { xmtp: "vNext" },
});
 
export const metadata: Metadata = {
  /**
   * ...other metadata
   */
  other: {
    ...frameMetadata,
  },
};

Validate incoming messages:

Validate incoming messages to ensure they are from XMTP.

import {
  isXmtpFrameRequest,
  getXmtpFrameMessage,
} from "@coinbase/onchainkit/xmtp";
/* ... */
async function getResponse(req: any): Promise<NextResponse> {
  const body: FrameRequest = await req.json();
  if (isXmtpFrameRequest(body)) {
    const { isValid, message } = await getXmtpFrameMessage(body);
    // ... do something with the message if isValid is true
    if (isValid) {
      const { verifiedWalletAddress } = message;
      // ... do something with the verifiedWalletAddress
    }
  } else {
    // ...
  }
}