MPP Tempo Buyer Demo

Tempo-first MPP buyer demo with Across pre-funding.

What Lives Here

• src/buyer/ contains the MPP buyer flow and Across funding logic.
• src/demo/ contains runnable demo entrypoints.
• src/dev/ contains local-only dev helpers and the local seller.
• STEP2-DEMO-PLAN.md is the agreed build plan for the separate MPP Step 2 batching demo.
• STEP2-IMPLEMENTATION-SPEC.md freezes the request flow, headers, logs, and acceptance criteria for the Step 2 build.

Wallet Surface

The demo uses a Tempo-native smart account via Account.fromSecp256k1() from viem/tempo. This gives the buyer proper Tempo signature envelopes, access key support, and fee sponsorship capability — unlike a plain viem EOA.

The wallet is resolved through src/buyer/tempo-wallet.ts:

• Preferred env: TEMPO_WALLET_PRIVATE_KEY
• Backward-compatible fallback: AGENT_PRIVATE_KEY

Commands

npm install
npm run preflight
npm run demo:local
npm run demo:external
npm run dev:server
npm run step2:server

Notes

• demo:local targets the local MPP dev seller by default.
• demo:external targets Firecrawl on Tempo mainnet.
• The local dev server remains here for smoke testing and workflow demos, but the product-facing story is buyer-first.