Read docs Updated 2026-06-16
What is Mempool?
Mempool is a Bitcoin API service that centers on transaction fee information.
It is useful for developers and applications that need current Bitcoin fee data to construct or analyze transactions.
What you can build with Mempool
Fee-aware Bitcoin wallet
Query current fee estimates to suggest optimal sat/vB rates when users create or broadcast transactions.
Mempool congestion dashboard
Poll fee histograms and mempool size data to visualize network load and display historical fee trends.
Automated transaction scheduler
Build scripts that delay or accelerate broadcasts based on real-time fee levels to minimize cost.
Get started with Mempool
- 1Visit the official Mempool API documentation site
- 2Identify the public HTTPS endpoints for fee estimates
- 3Send unauthenticated GET requests to retrieve JSON data
- 4Parse responses and integrate fee values into your code
- 5Add client-side caching to respect usage limits
Mempool: pros & cons
Pros
- +No API key or authentication required
- +HTTPS-only access for secure requests
- +Specialized focus on Bitcoin fee data
- +Simple public endpoints for quick integration
Cons
- –Bitcoin network only
- –No authenticated or personalized endpoints
- –Public access may be subject to rate limits
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A public service that returns Bitcoin transaction fee estimates and mempool statistics.
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