Arc
| Chain id | 5042 |
| Gas | USDC — native (18 decimals) with an ERC-20 face at the predeploy 0x3600000000000000000000000000000000000000 (6 decimals) |
| Finality | sub-second |
| Explorer | explorer.arc.io |
| Public RPC | https://rpc.mainnet.arc.io (rate-limited; Chord lists alternatives at getchord.xyz/rpc) |
| Chord index since | genesis (rollups reach genesisHour; pool discovery reached genesis) |
USDC, twice
Section titled “USDC, twice”Native USDC pays gas and appears as currency0 = address(0) in Uniswap V4 pools with 18 decimals; the predeploy is the same balance seen as an ERC-20 with 6 decimals (balanceOf == native / 1e12). There is no wrapped-native contract. The API takes the predeploy, treats the zero address as its alias, and always builds transactions with value: "0". Details in Chains, addresses and amounts.
Other anchors: EURC 0xbef5f6d51cb62b58e6a8f77868681825c6fe21c1 (6 decimals, tagged fx), VIRTUAL 0x8c4252c87081c88c6ad57d6dd97e1cafebf842b7 (Virtuals launcher quote asset, priced from its USDC prints). Beware tokens named USDC that are not the predeploy — the API flags them impostor.
Chord contracts
Section titled “Chord contracts”| Contract | Address |
|---|---|
Router (UUPS proxy) — transaction.to in every /swap answer |
0x1b1fee89a381e595fe6536b99ba91f3e16e9601a |
Fee collector (UUPS proxy) — feeBpsFor(token) is the on-chain fee authority |
0x6c66229675fd9ceda9a9b2ea2bd983b3d8255834 |
| Adapter registry (UUPS proxy) — the approved venue adapters | 0x6cf25d2af1a58d7094b0ac253ae616a8e1f2ea3f |
Adapters (one per venue family: Uniswap V3 and forks, Uniswap V4 with native currency, V2 with tax detection) are returned inside every quote’s routePlan; never hardcode them. The fee schedule: USDC and EURC 0 bps, every other token 5 bps.
Protocol contracts Chord reads
Section titled “Protocol contracts Chord reads”| Address | |
|---|---|
| Uniswap V3 factory | 0xf0db7b58379503491d857db50ac9ece64c653918 |
| Uniswap V3 QuoterV2 | 0x7dfd4f31be6814d2906bde155c3e1b146eac1468 |
| Uniswap V3 NonfungiblePositionManager | 0x39654a85a4c05127f5fd6ed22caec077a0fb1377 |
| Uniswap V2 factory | 0x89e5db8b5aa49aa85ac63f691524311aeb649eba |
| Uniswap V4 PoolManager | 0x8366a39cc670b4001a1121b8f6a443a643e40951 |
| Uniswap V4 PositionManager | 0x6049c9a0e26405c0985f9e3685c87d0ae917f82b |
| Uniswap V4 StateView | 0xf3334192d15450cdd385c8b70e03f9a6bd9e673b |
| Uniswap V4 Quoter | 0x8dc178efb8111bb0973dd9d722ebeff267c98f94 |
| SwapRouter02 | 0x53bf6b0684ec7ef91e1387da3d1a1769bc5a6f77 |
| Permit2 | 0x000000000022d473030f116ddee9f6b43ac78ba3 |
| Multicall3 | 0xca11bde05977b3631167028862be2a173976ca11 |
Venues
Section titled “Venues”Every pool from every factory and the V4 PoolManager is indexed for data; routing covers the Uniswap trio plus verified launchpad hooks and the named forks. Venue ids as they appear in dex fields:
| id | Venue |
|---|---|
uniswap_v4 |
Uniswap V4 (most launches live here; hooked pools are per-launcher curves) |
uniswap_v3 · uniswap_v2 |
Uniswap V3 / V2 |
pools_trade |
Pools.trade — V4 pools (fee 2500, tick spacing 25) through its launcher |
synthra_v3 |
Synthra |
sushi_v2 · sushi_v3 |
SushiSwap V2 / V3 |
dyorswap |
DYORSwap |
slipstream_fork |
an Aerodrome Slipstream fork (“Aero”) |
v3fork_<8hex> · v2fork_<8hex> |
unnamed forks, keyed by the first 8 hex of the factory |
GET /v1/arc/venues is the live list with volume and share. Names for display are in Venue ids.
Launchers
Section titled “Launchers”Arc’s tokens are mostly born through launcher contracts. Chord names 27 of them and indexes the rest by address; the Launchpads page lists them and GET /v1/arc/launchers reports their activity.
Data lanes
Section titled “Data lanes”| Lane | Freshness | Endpoint to check |
|---|---|---|
| Trade tape (every swap, priced) | seconds behind the head (WebSocket head trigger + a forward crawler) | /v1/arc/status → recentAt, staleSec |
| Hourly / daily rollups | rolled every few minutes | /v1/arc/status → coverage |
| Pool index (V2 / V3 / V4 discovery) | minutes | /v1/arc/status → index |
| Holder ledger (Transfer logs for tracked tokens) | forward lane near the head; backfill per token | /v1/arc/status → holders; per token complete |
| Liquidity events, pools, positions | minutes | /v1/lp/status |
| Live prices | per print, over WebSocket | subscribe prices |