Huddle to buy

Huddle lets anyone access volume discounts that only exist for enterprise buyers today.

A user texts their Telegram bot: "I want 10 H100 GPU hours, max $1.80/hr." Their local buyer agent hashes the intent and broadcasts it anonymously over Gensyn AXL's encrypted P2P mesh — no central server, no seller visibility. When 3 agents independently detect matching intent hashes (k-anonymity), they reveal to each other, elect a coordinator via deterministic lexicographic sort, and negotiate with the seller using the real X402 payment protocol.

The seller returns a bulk tier price ($1.50/hr vs $1.99 solo). All buyers approve with one tap. Funds pool into Coalition.sol on Gensyn Testnet — a state-machine escrow that holds the discounted price from every buyer. KeeperHub watches the contract: when all N buyers fund, it atomically commits the entire pool to the seller in a single transaction. If anyone drops out before the deadline, KeeperHub fires refundAll() — every buyer is made whole automatically.

The crypto layer is completely invisible. Users see: "Coalition found. You saved $3.00. Accept?" One tap. Done. Volume discounts on digital goods have always existed — Huddle makes them reachable for individuals for the first time.

Huddle is a TypeScript monorepo (pnpm workspaces) with four services running in a single Railway container: seller agent, three buyer agents, and a Telegram bot frontend.

GENSYN AXL — the entire P2P layer. Each agent runs as a separate OS process with its own AXL binary instance, ed25519 keypair, and port. Intent commitments (keccak256 hashes) are broadcast via a custom GossipSub implementation we built on top of AXL's send/recv — full GRAFT/PRUNE/IHAVE/IWANT mesh maintenance with D-parameter enforcement. The k-anonymity reveal handshake, coordinator election, and offer ratification all happen over AXL A2A messages. Removing AXL removes the product — there is no central broker.

KEEPERHUB — owns the atomic commit lifecycle. Two live workflows are registered on KeeperHub cloud (IDs: agfndtbs9xl7wlj9qa3ud and kt470bvmvs0aqyrtgi5ax). The commit workflow watches for N BuyerFunded events then calls Coalition.sol's commit() in a single atomic transaction with retry and MEV protection. The refund workflow fires refundAll() if validUntil expires with partial funding. N-party atomic commit is a novel KeeperHub usage — no prior project on their platform settles a multi-buyer threshold coalition.

0G — buyer identity and persistent memory. Each user mints an ERC-7857 Buyer Profile iNFT on 0G Testnet (contract: 0x86583710FB176b5a868262FCc95BFf0DfBeE130C). Profile preferences are uploaded to 0G Storage file layer via the 0g-ts-sdk (Merkle root stored as the iNFT's tokenURI). Coalition outcomes are written to 0G Storage KV via Batcher after each successful commit.

X402 — the seller charges a real on-chain micro-fee (0.01 MockUSDC) per price quote. The coordinator pays this fee, the seller verifies the Transfer event log on-chain before returning the tier price. Replay prevention via used_payments.json. This is real X402 semantics — HTTP 402 → on-chain payment → retry with X-Payment header.

COALITION.SOL — a Solidity state machine (Forming → Funded → Committed / Refunded) with reentrancy guards, keeper access control, and a liveness fallback (anyone can trigger refundAll after validUntil). Deployed on Gensyn Testnet. Deployed and tested end-to-end with real testnet tokens.

TELEGRAM BOT — Gemini Flash parses natural language intents with regex fallback, generates fresh EVM wallets per user, queues intents when agents are temporarily offline, polls agent status every 5s, and sends stage-by-stage coalition updates. The /faucet command auto-funds new wallets from a treasury. Users never see a wallet, a transaction, or a gas fee.

Notable hack: the coordinator election uses pure lexicographic sort of revealed peer IDs — zero election messages, deterministic, and crash-tolerant via a 30-second fallback timer that arms on the second-sorted peer. COORDINATOR_CRASH_TEST=true deliberately kills the primary mid-negotiation to demo the fallback live.