Managed Blockchain Data Apps
for Developers Who Don't Want to Run Indexers
Pick an app, get a token, call the API.
No nodes. No indexer ops. No infrastructure.
Three steps. No infra.
Activate an app
Choose a data app from the catalog and pick a plan. A free tier is available on every app. Infrastructure provisions automatically - no server, no config.
Get your API token
Copy your X-API-Key from the dashboard. One token per app. Manage, rotate, or revoke from the UI at any time.
Call the API
REST, gRPC, or SSE - depending on the app. Every app ships with documentation and working code examples.
Data apps available today
Each app is a self-contained data service with its own API, token, and billing.
Bitcoin & Ethereum Block Streaming
High-throughput gRPC stream of ordered blocks. Designed for teams that need to backfill an indexer or populate a data warehouse - without running a node.
- Ordered block delivery via gRPC
- Any range: genesis → tip, or any custom span
- Confirmed blocks (~6 BTC, ~50 ETH confirmations)
- Resumable: reconnect at any block height
- JSON and MessagePack wire formats
- WebSocket fallback
Bitcoin Fee Estimation & Mempool Analytics
REST + SSE API for Bitcoin fee recommendations, updated every 10-30 seconds. Beyond simple tiers - RBF, CPFP, deadline targeting, and batch optimization.
- fast / medium / slow sat/vB with per-txType fee estimate
- RBF bump calculator (BIP125-compliant)
- CPFP child fee planner
- Deadline fee: confirm within N seconds at probability P
- Batch planner: minimize cost across N transactions
- Mempool market data (tx count, vbytes histogram, thresholds)
- SSE stream - no polling needed
- Tx status: in_mempool / confirmed / replaced_by_rbf
EVM Gas Fee Estimation
Gas fee API for EVM networks. EIP-1559 and legacy gasPrice support. Accurate per-transaction gas estimation, baseFee prediction, stuck tx recovery, and batch planning.
- EIP-1559: maxPriorityFee + maxFeePerGas tiers
- Legacy gasPrice mode (Ethereum Classic)
- eth_estimateGas integration - real gas cost per tx
- BaseFee prediction N blocks ahead (worst-case)
- Stuck tx recovery (minimum +10% EVM rule)
- Batch transaction planner (minimize_cost, uniform, asap)
- Network market data (baseFee history, utilization)
- Networks: Ethereum, Polygon, BSC, Ethereum Classic
Indexed Data Apps
Pre-indexed historical data for specific protocols and token standards. REST API with a predictable schema - no full-chain traversal needed.
- Protocol-specific data models
- REST API with consistent schema
- Pagination and filtering built-in
- No node or indexer required
Custom Indexers
Define your data model in TypeScript using the dashboard UI - a code editor or file upload with deployment controls. OverBlock deploys and operates the indexer pipeline (historical or real-time). You consume the result via API.
Join Waitlist- Write your data model in TypeScript
- Deploy from the dashboard UI
- Historical and real-time modes
- OverBlock manages infrastructure, scaling, reorgs
- Consume results via API
What you skip when you use OverBlock
No node operations
No syncing Bitcoin Core or Erigon. No storage planning. No peer connectivity. We run the nodes.
No indexer maintenance
Reorg handling, schema changes, backfill restarts - managed by us. Your code only contains business logic.
Streaming throughput on tap
gRPC + MessagePack over a managed pipeline delivers block volumes that JSON-RPC polling cannot match.
Per-app token access
Each app has isolated tokens. Rotate, revoke, and monitor usage per token - all in the dashboard.
Flexible billing per app
Free to evaluate. PAYG by request or GB when usage varies. Subscriptions for predictable production billing.
Domain APIs, not raw RPC
You get fee recommendations, block streams, gas estimation - not a raw node proxy. Less parsing, faster integration.
Built for teams that work with blockchain data
Blockchain Indexer Teams
Building or migrating an indexer and need to backfill Bitcoin or Ethereum history. stream-app delivers ordered blocks via gRPC at throughput JSON-RPC polling cannot match - without a node.
Wallet & Exchange Developers
Need accurate, production-grade fee recommendations that handle RBF, mempool spikes, and tx size variance. bitcoin-fees-advisor: 30s refresh, RBF, CPFP, deadline APIs ready to integrate.
EVM dApp & Protocol Teams
Building on Ethereum, Polygon, or BSC and tired of hardcoded gasPrice breaking during congestion. evm-fees-advisor: EIP-1559 tiers, gas estimation per call, baseFee prediction, stuck tx recovery.
Custom Data Needs
Your data doesn't fit any off-the-shelf app. Custom indexers (coming soon) let you define exactly what to index in TypeScript - OverBlock runs the pipeline, you consume via API.
Flexible pricing, per app
Every app has its own plans. Free tier on all apps. No credit card to start.
- ·Rate-limited access
- ·No credit card required
- ·Available on every app
- ·Per request or per GB
- ·No minimum commitment
- ·Usage tracked in dashboard
- ·Fixed monthly cost
- ·Higher limits
- ·Best for production
Pricing varies per application. See plans inside the dashboard when activating an app.
Frequently Asked Questions
Start in 2 minutes. No infrastructure required.
Create an account, activate an app, copy your token. Free tier available on every app.
Open Dashboard