Bitcoin Fee Calculator

A TypeScript library for accurately calculating Bitcoin transaction sizes, virtual bytes (vBytes), and fees for various script types including SegWit and Taproot.

Features

• Calculate transaction sizes in both vBytes and raw bytes
• Support for all standard script types:
  • Legacy (P2PKH, P2SH)
  • SegWit (P2WPKH, P2WSH)
  • Taproot (P2TR)
  • Nested SegWit (P2SH-P2WPKH, P2SH-P2WSH)
• OP_RETURN data size calculation
• Fee estimation based on sat/vByte
• Inscription transaction fee calculation

Supported Script Types

| Type | Description | | ------------- | ----------------------------- | | P2PKH | Legacy Pay-to-Public-Key-Hash | | P2SH | Pay-to-Script-Hash | | P2WPKH | Native SegWit | | P2WSH | SegWit Script | | P2TR | Taproot | | P2SH-P2WPKH | Nested SegWit in P2SH | | P2SH-P2WSH | Nested SegWit Script in P2SH |

Development

1. Clone the repository:

   git clone https://github.com/ordinalsbot/bitcoin-fee-estimator.git
   cd bitcoin-fee-estimator

2. Optional - Using nvm:

   nvm install  # Uses version from .nvmrc
   nvm use      # Switches to correct Node version

3. Install dependencies:

   npm install

4. Run tests:

   npm test

5. Build the project:

   npm run build