add arc-mainnet (5042) support#217
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Arc (chainId 5042) is Circle's USDC-native L1: native gas token is USDC, no wrapped native, so pairs pair against native USDC and USDC is the reference token. Since the reference token IS the dollar, getEthPriceInUSD() returns 1 (no reference/stable pair exists) — opted in by including REFERENCE_TOKEN in STABLE_TOKEN_PAIRS; the guard only fires on that, so other chains are unaffected. - pricing.ts: return ONE_BD when STABLE_TOKEN_PAIRS.includes(REFERENCE_TOKEN) - config/arc-mainnet: V2 factory 0x89e5db8b... @ startBlock 1948011; REFERENCE_TOKEN = USDC, STABLECOINS = [USDC], WHITELIST = [USDC, EURC, USYC, cirBTC] - register arc-mainnet in the NETWORK enum Addresses per Uniswap/contracts deployments/5042.md; startBlock from explorer.arc.io. cirBTC (0x171A4217...) is BTC-pegged so it's whitelisted but excluded from STABLECOINS.
ciyengar3
approved these changes
Jun 8, 2026
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Adds Arc mainnet (chainId 5042, Circle's USDC-native L1) to the v2 + v2-tokens subgraphs.
Arc's native gas token is USDC and there's no wrapped native, so pairs pair against native USDC (
0x3600…0000, 6 dec) and USDC is the reference token. Because the reference token is the dollar,getEthPriceInUSD()returns 1 — opted in viaSTABLE_TOKEN_PAIRS = [REFERENCE_TOKEN]; the guard only fires onSTABLE_TOKEN_PAIRS.includes(REFERENCE_TOKEN), so every other chain is unaffected. (Mirrors v3-subgraph#300.)Changes
src/common/pricing.ts—return ONE_BDwhen the reference token is inSTABLE_TOKEN_PAIRS.config/arc-mainnet/— V2 factory0x89e5db8b…@ startBlock 1948011;REFERENCE_TOKEN = USDC,STABLECOINS = [USDC],WHITELIST = [USDC, EURC, USYC, cirBTC], thresholds mirrortempo.prepareNetwork.ts— registerarc-mainnet.EURC(EUR-pegged),USYC(yield-bearing) andcirBTC(0x171A4217…, BTC-pegged) are whitelisted but kept out ofSTABLECOINS. Builds verified for v2 + v2-tokens.Addresses per 5042.md; startBlock from explorer.arc.io.