Product release and essential updates

Arc Announcements & Updates

Types (@circle-fin/earn-kit, @circle-fin/provider-earn-service):

 Stronger typing for vault data — EarnOpportunity's nested facets (address, asOf, manager, apyProfile, fee, liquidityProfile, riskSignals) and EarnVaultInfo.liquidityProfile are now always present, so you can drop ?. / null-checks when reading vault results. No changes needed for existing code; runtime behavior is unchanged and deprecated flat aliases (currentApy, nativeApy, vaultFee, totalDeposits, liquidity) still work. 

(If you hand-build these objects in tests or mocks, you may need to fill in the new fields.)

Earn deposits (@circle-fin/provider-earn-service):

 Full-balance deposits on chains where gas and the deposit token are the same asset (e.g. Arc USDC) previously reverted on-chain with ERC20: transfer amount exceeds balance. They now fail fast 

 with a clear BALANCE_INSUFFICIENT_TOKEN (9001), so no gas is wasted. To use the real gas estimate instead of the 0.05 USDC fallback reserve, pass getDepositQuote's gasFees into the deposit call via the new optional SameChainDepositServiceParams.gasFees. ONCHAIN_TRANSACTION_REVERTED (5001) errors now include the transaction hash.

• 

Onramp (@circle-fin/onramp-kit, @circle-fin/app-kit):

 removes the unused destinationWallet query param from the widget launch URL.
• New @circle-fin/borrow-kit 1.0.0: over-collateralized USDC loans against Morpho markets on BorrowChain.Arc and BorrowChain.Arc_Testnet. Every loan write is submitted as one atomic batch. provider-borrow-service ships as its dependency.
• App Kit exposes Borrow Kit under kit.borrow, lists borrow chains via kit.getSupportedChains('borrow'), namespaces step events as borrow.execute, and adds a tree-shakeable @circle-fin/app-kit/borrow entry point.

• adapter-viem-v2/next batchExecute now rejects a fromAddress that differs from the connected account and throws if the wallet switches accounts mid-operation — both before broadcast. It also adds atomic batching for plain EOAs on Arc via Multicall3From, signs EIP-5792 sendCalls for unbound (developer-controlled) wallet clients, and returns the confirmed transaction's logs on every batch receipt.
• provider-earn-service maps Earn Service errors nested under response.status to their Earn error code instead of the bare HTTP status.




• FAST cross-chain deposits default to to Arc for mainnet sources and Arc_Testnet for testnet sources in deposit, depositFor, and estimateDeposit instead of throwing; allowanceStrategy on a FAST deposit now fails — app-kit, unified-balance-kit.
• Validation errors no longer surface as TypeError: Do not know how to serialize a BigInt: bigint fields render as strings, unserializable values as [unserializable object], and cause.trace.value is unchanged — every package below except borrow-kit and provider-borrow-service.



 (@circle-fin/*)
• Kits — app-kit 1.15.3→1.16.0, bridge-kit 1.15.1→1.15.2, swap-kit 1.7.0→1.7.1, unified-balance-kit 1.7.0→1.8.0, earn-kit 1.8.0→1.8.1, borrow-kit 1.0.0 (new)
• Providers — provider-cctp-v2 1.14.0→1.14.1, provider-gateway-v1 1.5.0→1.5.1, provider-stablecoin-service-swap 1.6.0→1.6.1, provider-stablecoin-service 1.0.4→1.0.5, provider-earn-service 1.7.0→1.7.1, provider-borrow-service 1.0.0 (new)
• Adapters — adapter-viem-v2 1.18.0→1.19.0, adapter-ethers-v6 1.12.0→1.12.1, adapter-solana 1.7.3→1.7.4, adapter-solana-kit 1.6.3→1.6.4, adapter-circle-wallets 1.8.0→1.8.1

New Stablecoin Kits releases!

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