Overview

Alchemy Gas Manager is an advanced, ERC‑4337 compliant paymaster designed to simplify blockchain transactions by sponsoring on‑chain gas fees on behalf of users. It allows developers to abstract complex gas logic and build seamless user experiences where gas costs are hidden or automatically managed. Gas Manager offers full programmatic control through robust Admin APIs and a powerful policy engine, enabling granular spending rules per user or application. Proven at scale, it has already sponsored over 47 million transactions across major chains including Ethereum, Arbitrum, Optimism, Polygon, Base, Zora, and others. Built with reliability and scalability in mind, it integrates deeply with Alchemy’s Account Abstraction ecosystem, providing the foundation for gasless transactions in production-grade decentralized applications.

Features and Capabilities

• **High-availability ERC‑4337 paymaster: **Scales horizontally to reliably handle millions of user operations in real-world applications.
• **Flexible gas policy engine: **Enables developers to define detailed spending policies, including per-user limits, global caps, allow/blocklists, and user operation limits via dashboard or Admin API.
• **Multi‑chain support. **Sponsors gas fees across top chains such as Ethereum, Arbitrum, Optimism, Polygon, Base, Zora, Solana, and additional EVM-compatible networks.
• **Integration with Account Abstraction SDK (AA‑SDK): **Provides seamless compatibility with Alchemy’s TypeScript-based SDK for managing Bundler and Paymaster interactions, user operation batching, and session handling.
• **Bundler and middleware support: **Works with Alchemy’s Bundler (Rundler) and Paymaster middleware to automate complex RPC calls like paymasterAndData, optimizing transaction workflows and gas estimation.
• **Real-time notifications & top-ups: **Delivers proactive alerts as policy limits approach and enables quick top-ups using credit card payments, ensuring uninterrupted service.
• **Free testnet gas sponsorship: **Supports free gas sponsorship on popular testnets to simplify testing and integration during development cycles.
• **ERC‑20 token sponsorship (coming soon): **Future capability to allow end users to pay gas fees using ERC‑20 tokens instead of native blockchain currency, providing additional flexibility in dApp design.