solders

Solders

solders is a high-performance Python toolkit for Solana, written in Rust. It provides robust solutions to the following problems:

• Core SDK stuff: keypairs, pubkeys, signing and serializing transactions - that sort of thing.
• RPC stuff: building requests and parsing responses (no networking stuff - if you want help with that, solana-py is your friend).
• Integration testing stuff: the solders.litesvm module is an alternative to solana-test-validator that's much more convenient and much faster. It's based on solana-program-test if you know that is.

What about solana-py?

solders and solana-py are good friends. solana-py uses solders under the hood extensively in its core API and RPC API. The main differences are:

• solders doesn't have functions to actually interact with the RPC server (though solana-py does use the RPC code from solders).
• solders doesn't provide SPL Token and SPL Memo clients.
• solana-py may not have support for all the RPC requests and responses provided by solders.
• solana-py doesn't have anything like the litesvm testing kit.

Since solana-py uses solders under the hood and they don't duplicate each other's features, you should just use whichever library you need.

Installation

pip install solders

Note: Requires Python >= 3.7.

Example Usage

>>> from solders.message import Message
>>> from solders.keypair import Keypair
>>> from solders.instruction import Instruction
>>> from solders.hash import Hash
>>> from solders.transaction import Transaction
>>> from solders.pubkey import Pubkey
>>> program_id = Pubkey.default()
>>> arbitrary_instruction_data = bytes([1])
>>> accounts = []
>>> instruction = Instruction(program_id, arbitrary_instruction_data, accounts)
>>> payer = Keypair()
>>> message = Message([instruction], payer.pubkey())
>>> blockhash = Hash.default()  # replace with a real blockhash
>>> tx = Transaction([payer], message, blockhash)

Development

Setup

• Install uv.
• Install the project dependencies (including dev tools):

uv sync --dev

• Activate the virtual environment (optional, uv run works without activation):

source .venv/bin/activate

Testing

• Run uv run maturin develop to compile the Rust code.
• Run uv run make fmt, uv run make lint, and uv run make test.