FAQ

I have an existing subscription on Basescan/BscScan and was redirected to Etherscan

We strongly recommend migrating to V2 for better usage management, stability, not to mention a sweet upgrade to access all other chains we support 😗

If you have trouble managing your plan or encountered errors, we'll get you sorted.

TL;DR what are the breaking changes ?

There are no breaking changes, all updates are backward-compatible.

To avoid service disruption, please switch to API V2 by 31 May 2025, as V1 API access will be disabled after this date. Learn more.

How many chains can I batch together ?

Our endpoint accepts one `chainId` at a time, feel free to repeat the query for each chain you need to access.

Is there an end of support/deadline to make changes ?

Please switch to API V2 by 31 May 2025 to avoid any service disruption. Learn more.

How do I reference the older V1 docs ?

Its still here.

How are rate limits calculated ?

Exactly as before—based on your plan, with a per-second request limit and an overall daily limit.

To manage this, you can set up programmatic alerts or enable overage charges if needed for peace of mind.

Does this cover contract verification ?

You can now verify multichain contracts via the Verify Source Code endpoint. Learn more about how to verifiy contracts across our supported chains.

• Foundry v1.2.0 now supports V2 API