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ERC20 Token

docs/vyper-by-example/erc20.rst

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.. index:: tokens;ERC20, ERC20

.. _erc20:

ERC20 Token

.. warning::

This is example code for learning purposes. Do not use in production without thorough review and testing.

A standard ERC20 fungible token implementation.

.. literalinclude:: ../../examples/tokens/ERC20.vy :language: vyper :linenos:

Key features:

  • Implements the IERC20 and IERC20Detailed interfaces from ethereum.ercs
  • Standard transfer, transferFrom, and approve functions
  • mint and burn functions for supply management
  • Uses HashMap for balances and allowances

.. note::

This is example code. Production tokens require additional security review.

Notice how Vyper's overflow/underflow protection is built-in: the comment "vyper does not allow underflows" explains why no explicit check is needed when subtracting from balances.