Engine

Engine is an open-source, backend server that reads, writes, and deploys contracts at production scale.

Engine enables your app to:

• Send multiple blockchain transactions at once.
• Resubmit stuck transactions, handling nonce values, gas settings, and RPC errors.
• Avoid duplicate transactions.
• Manage multiple backend wallets and their funds.
• Control access from your backends and team members.
• Sponsor user gas fees.
• Deploy and interact with smart accounts.
• Subscribe to contract events and transactions.

🚀 Get Engine hosted by thirdweb or self-host for free.

Supports 500 write transactions per second. Great for minting APIs, airdrops, and managing user wallets.

• High transaction throughput - Transactions batched on the same block with nonces managed automatically.
• Secure backend wallets - Your backend wallets stored locally, on AWS KMS, or on Google KMS.
• Any contract on any EVM chain - Supports contract calls on all 1700+ EVM blockchains and private subnets.
• Contract deployments - Deploy smart accounts, tokens, NFTs, marketplaces, and more.
• Account abstraction - Use smart accounts and session keys to transact on behalf of your users.
• Built-in relayer - Sponsor gas for your users so reduce user friction.
• Event webhooks - Get notified of wallet and contract events to automate other actions like payments or emails.
• Contract subscriptions - Store event logs and transaction receipts to be queried later.
• Transaction observability - Debug transaction failures with detailed timelines, onchain errors, and gas details.
• Idempotency - Prevent costly, duplicate transactions.
• Production-ready web3 infrastructure - Includes RPC, IPFS, and Account Abstraction out of the box.

Engine Premium provides added scaling and resilience. It include server autoscaling, server failover, database failover, and 30-day database backups.

• Everything in Standard Engine
• Autoscaling - Scale to millions of users with a fleet of Engine instances that scale up along with your traffic.
• Server & database failover - Infrastructure with fallbacks so you don't have to worry about downtime.
• Database backups - Recoverability and peace of mind for your stored data.

Cloud-hosting Engine with thirdweb starts at $99 per month. Learn more about Engine pricing.

Self-hosting Engine is always free.

For dedicated support and feature requests, contact Sales.