Tollbeam Developer Sandbox
Sign up and get a sandbox API key in the same response. It routes to Base, Optimism, and Arbitrum Sepolia immediately, so you can verify Tollbeam works before you ever talk to us.
One form, one response. Your API key is issued instantly and works on testnet right away.
Call pm_sponsorUserOperation on base-sepolia, optimism-sepolia, or arbitrum-sepolia. Tollbeam quotes every provider and returns the cheapest paymasterAndData.
Verify your email, log in to the dashboard, and create a production app when you are ready to route real traffic.
A sandbox key can never route to a mainnet chain, and no billing happens until you upgrade. Break things freely.