feat(circle): Arbitrum mainnet rollout (gate-pending)#19
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…te-pending) Extend Circle Paymaster v0.8 to Arbitrum mainnet (fee=10%, same as Base per Circle dev docs which scope the 10% surcharge to Arb/Base only). - smoke-circle-crossswitch: SMOKE_CHAIN=arbitrum (native USDC 0xaf88…, v0.8 PM 0x0578…700Ec, NEXT_PUBLIC_ARBITRUM_RPC_URL). assertPaymasterDeployed now also LOGS keccak256(code) so we can populate CIRCLE_PAYMASTER_CODEHASH (currently empty) after confirming Base/Arbitrum match → enables prod codehash check. - CIRCLE_GAS_SURCHARGE_BPS: re-enable [arbitrum.id]:1000. Note added that the other mainnets (OP/Polygon/Ethereum/Avalanche/Unichain) need on-chain effective- fee measurement before registering (10% not applicable + unquantified spread). - tests + runbook §段階リリース updated.⚠️ HOLD MERGE until the SMOKE_CHAIN=arbitrum real-device gate passes (the surcharge re-enable activates Arbitrum on merge+deploy). Branch is not deployed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Extend Circle Paymaster v0.8 (USDC gasless) to Arbitrum mainnet, the natural next chain after Base.
Per Circle dev docs (researched 2026-05-30), the 10% gas surcharge applies only to Arbitrum and Base — so Arbitrum uses the same fee model as Base (no new fee unknowns). The v0.8 paymaster address on Arbitrum (
0x0578…700Ec) was confirmed against official docs and matches the allowlist.Changes
smoke-circle-crossswitch:SMOKE_CHAIN=arbitrum(native USDC0xaf88…, v0.8 PM0x0578…700Ec,NEXT_PUBLIC_ARBITRUM_RPC_URL).assertPaymasterDeployednow logskeccak256(code)so we can populate the currently-emptyCIRCLE_PAYMASTER_CODEHASHafter confirming Base/Arbitrum match → enables the production codehash check.CIRCLE_GAS_SURCHARGE_BPS: re-enable[arbitrum.id]: 1000. Comment documents that the other mainnets (OP/Polygon/Ethereum/Avalanche/Unichain) need on-chain effective-fee measurement before registering (10% not applicable there + unquantified slippage spread).The surcharge re-enable activates Arbitrum on merge+deploy. Hold merge until the
SMOKE_CHAIN=arbitrumreal-device gate returns 3-leg PASS (mainnet paymaster0x0578…700Ec). Branch is not deployed, so it's safe un-merged.Test
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