> ## Documentation Index > Fetch the complete documentation index at: https://docs.eco.com/llms.txt > Use this file to discover all available pages before exploring further. # Arc > Everything a program can name on Arc, and how a program writes each name. **Supported.** Sauce supports transactions on Ethereum, Base, Arc and Solana, and the testnets Arc Testnet, Base Sepolia, Ethereum Sepolia, Solana Devnet and Solana Testnet. On Arc a program compiles and simulates, and the `sauce` command and the MCP server build its transactions and send them. | Fact | Value | | - | - | | Support | supported: transactions are built and sent | | Slug (`--chain`) | `arc`; also `arc-mainnet`, `arc-network` | | Chain id | 5042 | | Kind | EVM | | Name in a program | `Arc` | | In TypeScript | `import { Arc } from "@eco-incorp/sauce"`: its tokens and protocol namespaces are properties of it | | Native coin | USDC (USDC), 18 decimals; also the ERC-20 `USDC` (6 decimals), one balance | | Minimum base fee | 20 gwei: a transaction with a lower `maxFeePerGas` is never included | | Sauce | the engine, Kitchen and Routers, at the same addresses on every EVM chain: [Deployments](https://docs.eco.com/sauce-sdk/reference/deployments.md) | | CCTP domain | 26 | ## Notes Arc pays gas in USDC, and has one USDC balance at two decimal scales: the native coin (`msg.value`, `eth_getBalance`, gas) has 18 decimals, and the ERC-20 `USDC` at `0x3600000000000000000000000000000000000000` has 6. Sending native value and calling `USDC.transfer` move the same money. * 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. ## In a program Compiled with `--chain arc`, a program names Arc's tokens and contracts with no import; the same file compiled for another chain resolves each name there, or fails where the chain does not have it. ```ts theme={null} 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); } ``` ## Tokens | Symbol | Address | Decimals | | - | - | - | | `EURC` | `0xbEf5f6d51CB62b58e6A8f77868681825C6fe21c1` | 6 | | `USDC` | `0x3600000000000000000000000000000000000000` | 6 | | `USYC` | `0x8a5D989Bbb96929F689B0200f435f53dA42bF490` | 6 | | `WETH` | `0x128cC466B61f542da60c70e3aA11c10e19B84EDB` | 18 | ## Protocols Every protocol the registry records here, each contract with how a program names it: its namespace contract, or its ABI imported from `./protocols//.json` and bound to the address. | Protocol | Contract | Address | In a program | | - | - | - | - | | [Aave V4](https://docs.eco.com/sauce-sdk/reference/protocols/aave-v4.md) | coreHub | `0x17288dfc86205301064577b98B02b81017e6F79C` | `AaveV4.CoreHub` | | [Aave V4](https://docs.eco.com/sauce-sdk/reference/protocols/aave-v4.md) | forexSpoke | `0x4164EBCAF74670aa74C8D4F59de6157c0780F1bB` | `AaveV4.ForexSpoke` | | [Aave V4](https://docs.eco.com/sauce-sdk/reference/protocols/aave-v4.md) | mainSpoke | `0xB843bdC3a87A05E77E07Df9FE48928b3A34b134d` | `AaveV4.MainSpoke` | | [Across](https://docs.eco.com/sauce-sdk/reference/protocols/across.md) | spokePool | `0x9b4A302A548c7e313c2b74C461db7b84d3074A84` | `Across.SpokePool` | | [Aerodrome Slipstream](https://docs.eco.com/sauce-sdk/reference/protocols/aerodrome-slipstream.md) | clFactory | `0xb89Df768aF2CFE637ceB352c587Fe8edAf491d03` | `AerodromeSlipstream.CLFactory` | | [Aerodrome Slipstream](https://docs.eco.com/sauce-sdk/reference/protocols/aerodrome-slipstream.md) | metarouter | `0x7275fA44c67bba8D921422e600b4Ed396209C886` | `AerodromeSlipstream.Metarouter` | | [Aerodrome Slipstream](https://docs.eco.com/sauce-sdk/reference/protocols/aerodrome-slipstream.md) | nonfungiblePositionManager | `0xc84bB45D43CD25D02b83B4C085eaA4e08da8f473` | `AerodromeSlipstream.NonfungiblePositionManager` | | [CCTP](https://docs.eco.com/sauce-sdk/reference/protocols/cctp.md) | tokenMessenger | `0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d` | `Cctp.TokenMessenger` | | [Chainlink](https://docs.eco.com/sauce-sdk/reference/protocols/chainlink.md) | ethUsdFeed | `0x50FCDD99D6762D1C170DC6A9111db944AEE6D364` | `Chainlink.EthUsdFeed` | | [Chainlink CCIP](https://docs.eco.com/sauce-sdk/reference/protocols/chainlink-ccip.md) | router | `0xB79791184973589c38e114D43Eb8E4588C283A18` | `ChainlinkCcip.Router` | | [Circle Gateway](https://docs.eco.com/sauce-sdk/reference/protocols/circle-gateway.md) | gatewayMinter | `0x2222222d7164433c4C09B0b0D809a9b52C04C205` | `CircleGateway.GatewayMinter` | | [Circle Gateway](https://docs.eco.com/sauce-sdk/reference/protocols/circle-gateway.md) | gatewayWallet | `0x77777777Dcc4d5A8B6E418Fd04D8997ef11000eE` | `CircleGateway.GatewayWallet` | | [deBridge](https://docs.eco.com/sauce-sdk/reference/protocols/debridge.md) | dlnDestination | `0xE7351Fd770A37282b91D153Ee690B63579D6dd7f` | `Debridge.DlnDestination` | | [deBridge](https://docs.eco.com/sauce-sdk/reference/protocols/debridge.md) | dlnSource | `0xeF4fB24aD0916217251F553c0596F8Edc630EB66` | `Debridge.DlnSource` | | [Hyperlane](https://docs.eco.com/sauce-sdk/reference/protocols/hyperlane.md) | mailbox | `0x7f50C5776722630a0024fAE05fDe8b47571D7B39` | `Hyperlane.Mailbox` | | [KyberSwap](https://docs.eco.com/sauce-sdk/reference/protocols/kyberswap.md) | metaAggregationRouterV2 | `0x6131B5fae19EA4f9D964eAc0408E4408b66337b5` | `Kyberswap.MetaAggregationRouterV2` | | [KyberSwap Aggregator](https://docs.eco.com/sauce-sdk/reference/protocols/kyberswap-aggregator.md) | metaAggregationRouter | `0x6131B5fae19EA4f9D964eAc0408E4408b66337b5` | `KyberswapAggregator.MetaAggregationRouter` | | [LayerZero](https://docs.eco.com/sauce-sdk/reference/protocols/layerzero.md) | endpointV2 | `0x6F475642a6e85809B1c36Fa62763669b1b48DD5B` | `Layerzero.EndpointV2` | | [LI.FI](https://docs.eco.com/sauce-sdk/reference/protocols/lifi.md) | lifiDiamond | `0xA4072583658Fae592A3506A42431cb6316a8d40b` | `Lifi.LiFiDiamond` | | [Morpho Blue](https://docs.eco.com/sauce-sdk/reference/protocols/morpho-blue.md) | morpho | `0x34CD04070dD72b14E241112F6d83812Df5Af7fCD` | `MorphoBlue.Morpho` | | [Permit2](https://docs.eco.com/sauce-sdk/reference/protocols/permit2.md) | permit2 | `0x000000000022D473030F116dDEE9F6B43aC78BA3` | `Permit2.Permit2` | | [Safe](https://docs.eco.com/sauce-sdk/reference/protocols/safe.md) | safeL2V130 | `0x3E5c63644E683549055b9Be8653de26E0B4CD36E` | `Safe.SafeL2V130` | | [Safe](https://docs.eco.com/sauce-sdk/reference/protocols/safe.md) | safeV141 | `0x41675C099F32341bf84BFc5382aF534df5C7461a` | `Safe.SafeV141` | | [Seaport](https://docs.eco.com/sauce-sdk/reference/protocols/seaport.md) | seaportV16 | `0x0000000000000068F116a894984e2DB1123eB395` | `Seaport.SeaportV16` | | [Synthra V3](https://docs.eco.com/sauce-sdk/reference/protocols/synthra-v3.md) | factory | `0x6307fc239C7964942c1BfFE51930E55606619c74` | `SynthraV3.Factory` | | [Synthra V3](https://docs.eco.com/sauce-sdk/reference/protocols/synthra-v3.md) | nonfungiblePositionManager | `0x2743b771659fD9CE13970d7367e7e84AF6a31049` | `SynthraV3.NonfungiblePositionManager` | | [Synthra V3](https://docs.eco.com/sauce-sdk/reference/protocols/synthra-v3.md) | quoterV2 | `0x9c179A7335B3fc841F59Aa6a62daf6d5c61b65D7` | `SynthraV3.QuoterV2` | | [Synthra V3](https://docs.eco.com/sauce-sdk/reference/protocols/synthra-v3.md) | swapRouter02 | `0xa50eDe66a573eE5bB37E28AF5789B76aE5FEb828` | `SynthraV3.SwapRouter02` | | [Uniswap V2](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v2.md) | factory | `0x89e5DB8B5aA49aA85AC63f691524311AEB649eba` | `UniswapV2.Factory` | | [Uniswap V2](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v2.md) | router | `0x1f7d7550B1b028f7571E69A784071F0205FD2EfA` | `UniswapV2.Router` | | [Uniswap V3](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v3.md) | factory | `0xf0db7b58379503491d857dB50AC9ece64c653918` | `UniswapV3.Factory` | | [Uniswap V3](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v3.md) | nonfungiblePositionManager | `0x39654A85A4C05127f5Fd6ED22CAeC077A0fB1377` | `UniswapV3.NonfungiblePositionManager` | | [Uniswap V3](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v3.md) | quoterV2 | `0x7DfD4F31be6814D2906BDE155c3e1B146EAc1468` | `UniswapV3.QuoterV2` | | [Uniswap V3](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v3.md) | swapRouter02 | `0x53BF6B0684Ec7eF91e1387Da3D1a1769bC5A6F77` | `UniswapV3.SwapRouter02` | | [Uniswap V4](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v4.md) | poolManager | `0x8366a39CC670B4001A1121B8F6A443A643e40951` | `UniswapV4.PoolManager` | | [Uniswap V4](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v4.md) | positionManager | `0x6049c9a0e26405C0985f9E3685C87d0aE917f82B` | `UniswapV4.PositionManager` | | [Uniswap V4](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v4.md) | stateView | `0xF3334192D15450CdD385c8B70e03f9A6bD9E673b` | `UniswapV4.StateView` | | [Uniswap V4](https://docs.eco.com/sauce-sdk/reference/protocols/uniswap-v4.md) | universalRouter | `0x4fcA4a51Ab4F23A7447b3284fBd7D73289A89Fb1` | `UniswapV4.UniversalRouter` | | [UnitFlow V3](https://docs.eco.com/sauce-sdk/reference/protocols/unitflow-v3.md) | factory | `0x5bfBCeb73d39F722B1cB83fD2F11736b28c1Be6d` | `UnitflowV3.Factory` | | [UnitFlow V3](https://docs.eco.com/sauce-sdk/reference/protocols/unitflow-v3.md) | quoter | `0x5AF6E89F0960Ff375AF84d9911D8153ef6240E34` | `UnitflowV3.Quoter` | | [UnitFlow V3](https://docs.eco.com/sauce-sdk/reference/protocols/unitflow-v3.md) | router | `0x6fD8351b9596C1F0b2f2479BfA6A171cb3d0f410` | `UnitflowV3.Router` | | [Wormhole](https://docs.eco.com/sauce-sdk/reference/protocols/wormhole.md) | coreBridge | `0xC8aD24fC6063c41cB5C12a8e3851AafC3b3CF027` | `Wormhole.CoreBridge` | ## Next steps * [Chains](https://docs.eco.com/sauce-sdk/reference/chains.md): every other chain, with its support. * [Names and registries](https://docs.eco.com/sauce/names.md): how a name in a program becomes an address on the chain it is compiled for. * [Glossary](https://docs.eco.com/sauce/glossary.md): the words these pages use, in plain terms. 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