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Thousands of developers are building on the Blockscout Pro API. This month, we go in depth with one of them: Keeper, the wallet formerly known as Tonkeeper. In our interview, we cover how they use the API, how they optimized response times, and how it powers their in-app features.
Keeper uses the Pro API for blockchain data across Ethereum, Arbitrum, and Base, and links out to the Blockscout explorer for transaction details. Tonkeeper spent years as the leading self-custody wallet on TON before its rebrand earlier this year.
This is the first in a series of posts highlighting the projects and developers building with the Pro API. Upcoming case studies will include technical details showing how the community is using the API in new ways across hundreds of chains.
The Pro API includes a free tier on most chains, with 5 requests per second and 100K credits per day. It starts as soon as you generate a key at dev.blockscout.com.
“Pro” stands for production-ready, professional-grade data. Features include higher rate limits than competing services, real-time usage dashboards, and up to 50 API keys per account.
Adoption keeps growing. Signups took off in September, and daily new signups are now at their highest level this year.
Chain access:
Paid plan required: Base, Polygon, and zkSync
No paid plan required: Robinhood Chain, Arc, and 100+ more.
If you are a builder using our Pro API, we'd love to hear more! Drop us a note and let us know how you're using it.
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🗞️ Blockscout News in Brief
Blockscout v12 is a huge optimization update and includes some breaking changes. It's rolling out now, starting with our hosted testnets.
The Pro API Buildathon hosted by Craftora is live: Sprint 1 runs Oct 8 to 24 with a 1,200 USDC credits pool
Catch up on our recent posts with the Monthly Roundup, Onion Mode (Private Browsing), and Autoscout Wizard
🚀 v12 rolling out, testnets first
Blockscout v12.0.0 is rolling out to hosted instances, and testnets are first. Standout additions and optimizations:
ERC-8056 token type support
Sourcify integration migrated from API v1 to v2
Log input decoding in ABI-like format for transactions
New
api/v2/tokens/batchendpointCSV export of token transfers from a token page
v12 also includes breaking changes for API integrators, including a change to how items_count works in pagination and the removal of all /api/v2/mud/* endpoints. Look for a deeper dive into the update in an upcoming blog post.
🛠️ Craftora's Pro API Buildathon is live
The Craftora hackathon is now underway, and sprint 1 runs Oct 8 to 24. Projects need to use the Blockscout Pro API at their core. Registration is still open, and builder compete for a 1,200 USDC credits pool, mentorship from the Blockscout team, and certificates and winner badges!
📚 Catch up on our recent posts
Scouting September: An overview of news in the ecosystem including the $351M Bitget hack pushes North Korea past $1B in 2026, ETF inflows hit a 2026 record, the CLARITY Act stalls, and L1s race to sub-second finality
Onion Mode: the Ethereum explorer also runs as a Tor-native onion service
Autoscout Wizard: deploy an explorer with only a name and an RPC URL
The Blockscout newsletter goes out to MyAccount community users on supported chains. We welcome your feedback on topics you'd like to see covered.
Connect with us on X or Discord
Connect with us on X or Discord to get your explorer questions answered or get your project added to our growing network list.
