feat: add Circle Arc testnet chain (PAR-40)#112
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Adds the Circle Arc testnet (chain ID 5042002) definition:
- Native gas token USDC (18-decimal native accounting; ERC-20 USDC is 6 decimals)
- Alchemy RPC with ${ALCHEMY_API_KEY} templating plus public Arc RPCs
(arc.network, QuickNode, Blockdaemon, dRPC)
- ArcScan block explorer with Etherscan-compatible API
- Canonical multicall3, USDC stable at 0x3600...0000 (6 decimals)
Arc mainnet (5042) is intentionally not included: Circle's public mainnet
RPC/USDC/CCTP details are unpublished (private mainnet only, pending PAR-26),
and shipping a mainnet chain without working RPCs would break consumers that
enumerate getMainnetChains() (e.g. balances-service).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Adds Circle Arc Testnet (chain ID 5042002) to
@eco-foundation/chains(PAR-40). New definitionsrc/definitions/arc.tsexportingarcTestnet, registered inEcoRoutesChains/EcoRouteChainMap, with a dedicated test suite.Chain facts
https://arc-testnet.g.alchemy.com/v2/${ALCHEMY_API_KEY}(+wss), key injected viaEcoChains/api)0xcA11bde05977b3631167028862bE2a173976CA11(blockCreated 0)0x3600000000000000000000000000000000000000(6 decimals)truefalseArc mainnet (5042) intentionally excluded
Circle's public mainnet RPC/USDC/CCTP details are not yet published (private mainnet only; pending PAR-26 / Circle private docs). Shipping a mainnet definition with no working RPCs would break downstream consumers that enumerate
getMainnetChains()— notably balances-service, which auto-tracks every mainnet chain. A TODO insrc/definitions/arc.tsdocuments this.Downstream
feat:commit → semantic-release will cut a minor release (2.3.3 → 2.4.0) on merge; CHANGELOG is generated automatically.Testing
pnpm test— 50/50 pass (newsrc/tests/arc.spec.ts: stables lookup, getChain by id, Alchemy key substitution/filtering, testnet classification, mainnet-absent guard)pnpm lint,pnpm prettier,pnpm build— clean🤖 Generated with Claude Code