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Tooling · medium

36. Gas considerations in Vyper

Where Vyper contracts typically spend gas.

1 min read3 questionsup to 50 XPtopic 36/50

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Storage reads/writes (SLOAD/SSTORE) dominate gas cost, exactly as in Solidity. Vyper's built-in overflow checks and bounds checks add a small, predictable overhead per operation in exchange for eliminating a whole bug class — a trade most teams consider worthwhile.

@external
def batch_credit(users: DynArray[address, 50], amounts: DynArray[uint256, 50]):
    assert len(users) == len(amounts), "length mismatch"
    for i in range(50):
        if i >= len(users):
            break
        self.balances[users[i]] += amounts[i]

Favour `@view`/`@pure` where truthful, cache repeated `self.x` reads into a local variable within a function, and keep `DynArray` bounds as tight as the real use case requires.

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Check your understanding

  1. 1. What typically dominates gas cost in a Vyper contract?

  2. 2. What's a simple local optimization for repeated storage reads?

  3. 3. What overhead does Vyper's built-in overflow checking add?

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