Foundational tools to get you started

User Operations per month*
  • Testnet paymasters only
  • No card required

Essential infrastructure for building applications with account abstraction

User Operations per month*
  • Mainnet paymasters
  • Up to 12 apps
  • 100 requests/second
  • $1.00 per additional 500 user operations
  • Teams

Our most powerful and reliable infrastructure for advanced control and flexibility at scale

  • Revenue share paymasters
  • Dedicated blockchain instances
  • Alternative mempools
  • Unlimited apps
  • Dedicated support

Looking for something custom?

Dedicated support, bulk pricing, custom implementation and more is available. Dozens of companies trust Stackup to guide them through implementing ERC-4337 in their projects.

Frequently Asked Questions

How do I start?

The fastest way to get started with ERC-4337 is with the ERC-4337 quickstart guide.

Can you help me with my project?

You can book a discovery package where we can do a dedicated analysis and answer all of your questions. Stackup is not a professional services firm, but if you use our infrastructure we'll do our best to get you off the ground. Dedicated support options are also available as an add-on service.

Why do I need more than one app key?

Each API key corresponds to a single network. So if you have only one API key, you can only access one network with a single set of security rules in your dashboard. Sometimes, you will want multiple API keys to access the same network. For example, you may want to have a different API key for your backend services than your front end application.

What blockchains does Stackup support?

Stackup supports Ethereum, Polygon, Arbitrum, Optimism, Avalanche C Chain, and BnB Smart Chain (BSC).

Can I add a fee to my paymaster or do revenue share?

Yes, but right now this isn't self-serve. Please contact us at