Hedera for Developers
@hedera_devs
Latest dev information on tooling, announcements, events, & resources to build successfully on @hedera. For network status, visit @HederaStatus.
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Five templates won the Scaffold HBAR Template Bounty last week: multisig governance, limit orders, liquidation checks, recurring buys and prediction market settlement. Meet the winners 🧵
Reminder: AMA and office hours tomorrow, Tue 29 Sep, 10:00 ET.
It's the session where we pin down how to score highly and win prizes. Bring whatever you're building and get it checked against the rubric while there's still time to change it!
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You don't have to hand-write every scaffold-hbar template.
hedera-harness takes a product brief, generates code, then tests it with an agent driving the live UI.
If it catches any issues, it retries until it passes. If you're building a template for the bounty, start here.
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1/ CLPR is open source! And the HIP proposing it for Hiero is public now. Cross-ledger messaging is built on state proofs, so each ledger verifies the other's committed state using only the two ledgers' own consensus guarantees. A short overview 🧵👇
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Congrats to all five, and thanks to everyone who submitted.
The full write-up, with repos, demos and links for each build:
Mystic
A pay-as-you-go VPN. Log in with an email, buy WireGuard tunnel time by the minute, and each session settles as an HBAR transfer using the x402 exact scheme.
Qisma
exact-multi, an x402 v2 scheme that settles a whole machine-to-machine supply chain in one atomic CryptoTransfer.
One request pays an aggregator and its three upstream APIs at one consensus timestamp, for one fee. No splitter contract, no escrow.
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Xorv
Rent out the AI subscription quota you already pay for, get paid per job in USDC over x402.
HTS handles sub-cent transfers at a fixed fee, HCS holds the audit trail. The facilitator pays gas, so a buyer holding only stablecoin can transact.
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Tally
The first non-EVM implementation of x402's upto scheme. An agent signs one spending ceiling off-chain, gas-free, then pays only what was metered.
The cap is enforced in consensus against an HTS allowance, and every bill is hashed on-chain so you can recompute it.
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Pinout
One x402 payment becomes a metered session. Credits burn per second, the agent tops up mid-job without losing state, and the unused remainder is refunded on-chain.
Per-second checkpoints on HCS, settlement anchored to a HIP-991 topic. No contracts.
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The x402 bounty on Hedera is done. Five builds won $1,000 each.
Metered compute sessions, agent spend caps, atomic multi-party settlement, an AI quota marketplace, and a VPN you pay for by the minute.
All five run on testnet with public repos. Here's what they built 🧵
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Your Hedera EVM address can exist before the account does. Send a transfer to it and the network creates the account for you, no pre-created 0.0.x id required. How auto account creation works 🧵
The x402 bounty closes tonight, 11:59 PM ET. Last call to submit your pay-per-request build on Hedera.
