Arc

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Notes

• A Pot that spends its whole USDC balance and also pays a native fee from the program (a bridge’s or a messenger’s fee) runs out: that fee comes from the same balance. Leave room for it.
• An ordinary cook’s Kitchen fee is attached value from the owner’s wallet: native USDC at 18 decimals, paid on to the Kitchen before the program runs. An owner-signed cook may instead pay it from funds already in the Pot.
• balanceOf is the native balance divided by 10^12 and rounded down, so less than 10^12 wei reads as 0. Compare a native amount with a token amount only after converting one to the other’s scale.
• In a program, pot.USDC is the Pot’s 6-decimal USDC token balance and pot.balance its 18-decimal native one: the same money at the two scales.
• Every native amount has 18 decimals: an execution fee or a cook’s value. 1_000_000 of native value is 10^-12 USDC, not 1 USDC.
• A transaction whose maxFeePerGas is below the minimum base fee (the table above) is never included: it can stay pending with no receipt, or be refused as underpriced. Arc’s own documentation asks for a maxFeePerGas of at least that fee, and a tip of 0 is accepted.
• There is no canonical wrapped native, and nothing needs wrapping. WETH is bridged ETH, with no deposit() or withdraw(), and Uniswap’s Arc periphery reports a WETH9() that always reverts, so the ETH paths of its routers revert too. Wrapping, unwrapping and staking the native coin are refused for Arc.
• Native value sent to the zero address, to or from a blocklisted address, or to a self-destructed account reverts, also when a contract forwards it.

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In a program

function main() {
  // `EURC` is Arc's EURC: `0xbEf5f6d51CB62b58e6A8f77868681825C6fe21c1`.
  const held = EURC.balanceOf(pot);
  // `Token(address)` is any other ERC-20, and works for a symbol's address too.
  require(Token(EURC).balanceOf(pot) == held);
  // `AaveV4.CoreHub` is Arc's coreHub: `0x17288dfc86205301064577b98B02b81017e6F79C`.
  require(AaveV4.CoreHub != 0);
  // The same contract, qualified by the chain's name, from a program on any chain.
  require(Arc.AaveV4.CoreHub == AaveV4.CoreHub);
}

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Tokens

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Protocols

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Next steps

• Chains: every other chain, with its support.
• Names and registries: how a name in a program becomes an address on the chain it is compiled for.
• Glossary: the words these pages use, in plain terms.