From d6477d901579f00159b9b17b7ee6f74a09c4e336 Mon Sep 17 00:00:00 2001 From: jlin27 Date: Thu, 1 Oct 2026 14:24:00 +0000 Subject: [PATCH 1/3] Add September 2026 changelog and refresh Release Highlights Covers the Arc (5042) launch across Swap, Gasless, and Cross-Chain, new liquidity sources on nine chains, new LayerZero OFT routes, cross-chain status fixes, and two breaking changes. Replaces the July rows in the homepage Release Highlights table with September, keeping the two August rows. --- fern/docs/changelog/2026-09-30.mdx | 44 ++++++++++++++++++++++++++++++ fern/docs/pages/index.mdx | 13 ++++----- 2 files changed, 50 insertions(+), 7 deletions(-) create mode 100644 fern/docs/changelog/2026-09-30.mdx diff --git a/fern/docs/changelog/2026-09-30.mdx b/fern/docs/changelog/2026-09-30.mdx new file mode 100644 index 00000000..75651325 --- /dev/null +++ b/fern/docs/changelog/2026-09-30.mdx @@ -0,0 +1,44 @@ +--- +tags: [] +--- + +#### 📣 Announcements + +- **Arc is now live**: Arc (`5042`) is generally available across the Swap, Gasless, and Cross-Chain APIs, with native DEX and launchpad coverage from day one. [See supported chains](https://docs.0x.org/docs/introduction/supported-chains). + +#### New Chains + +- **Arc:** Now supported in Swap API, Gasless API, and Cross-Chain API (chain ID `5042`). + +#### New Liquidity Sources + +- **Arbitrum:** Added Rubicon CLMM (Uniswap V3). +- **Arc:** Added AchSwap V2 (Uniswap V2), AchSwap V3 (Uniswap V3), Aero Lite (Uniswap V3), CooCoo, DegenX, DYORSwap (Uniswap V2), Faze, Flap, Foci, Lotus, Peach, SushiSwap and SushiSwap V3, Synthra V3 (Uniswap V3), Virtuals, and WarpDex (Uniswap V2). +- **Base:** Added BaiBai and Manta. +- **BSC:** Added FourMeme, Kaliber, Metric V2, and Prism. +- **Ethereum:** Added Motoswap and Rubicon CLMM (Uniswap V3). +- **Ink:** Added BlotSwap V2 (Uniswap V2), BlotSwap V3 (Uniswap V3), Tsunami (Uniswap V4), Tsunami Curve, Uniswap V2, and Uniswap V4. +- **Monad:** Added Pendle. +- **Optimism:** Added Rubicon CLMM (Uniswap V3). +- **Robinhood Chain:** Added Bags V3, CooCoo, ElfomoFi, Kittenswap (Algebra), Manta, Orvex CL (PancakeSwap Infinity), Pendle, Proto, Rubicon CLMM (Uniswap V3), Synthra V3 (Uniswap V3), TesseraSwap, and WOOFi V2. + +#### New Features + +- **Arc native USDC in Swap and Gasless API**: USDC is both Arc's native gas token and an ERC-20 at `0x3600000000000000000000000000000000000000`. The two are quoted as separate assets — 18 decimals for the native interface, 6 for the ERC-20 — and Arc has no wrapped native token. [See chain-specific native tokens](https://docs.0x.org/evm/0x-swap-api/additional-topics/chain-specific-native-tokens). +- **Arc bridging in Cross-Chain API**: Arc is quotable as both origin and destination over Relay, Across V4, and Circle CCTP in standard and fast modes. +- **New LayerZero OFT routes in Cross-Chain API**: Added OFT routes for USDS (Ethereum, Avalanche, Solana), PENDLE (Ethereum, Berachain, HyperEVM, Monad, Plasma, Robinhood Chain), USDai and sUSDai (Ethereum, Base, Solana, and Arbitrum to Arc), and USDe and sUSDe on Monad and Solana. +- **`TOKEN_NOT_SUPPORTED` now names the token**: The error's `data` object carries the unsupported `token` address in Swap and Gasless API. + +#### Bug Fixes + +- Fixed incorrect buy amounts on Across V4 routes when a single transaction filled several orders. +- `/cross-chain/status` now reports fast CCTP transfers as `circle_forwarder_fast` instead of `circle_forwarder_standard`, with the matching ETA. +- `/cross-chain/status` now resolves Solana destination fills sent as version 1 transactions. +- `/cross-chain/status` no longer walks a terminal status back to `bridge_pending` after a refund lands. +- Solana-origin OFT quotes are no longer dropped when the seller holds no token account for the token being sold. +- Routes no longer place fills below a pool's minimum sell amount, which previously caused DODO DPP trades to revert on execution. + +#### Breaking Changes + +- **Authorization failures in Cross-Chain API have their own error codes**: `/cross-chain/quotes` now returns `TAKER_NOT_AUTHORIZED_FOR_TRADE` or `RECIPIENT_NOT_AUTHORIZED_FOR_TRADE` (403) and `SELL_TOKEN_NOT_AUTHORIZED_FOR_TRADE` or `BUY_TOKEN_NOT_AUTHORIZED_FOR_TRADE` (422) where it previously returned `INPUT_INVALID`. +- **Reserve DTF tokens and PAXGy now require RWA access**: PHOTON, BUILDOUT, POWER, NEOCLOUD, and ROBOTS on BSC, and Paxos PAXGy, are gated behind the same opt-in as other tokenized real-world assets. Integrators without it are rejected on Swap, Gasless, and Cross-Chain requests. diff --git a/fern/docs/pages/index.mdx b/fern/docs/pages/index.mdx index 685da0af..50e31e79 100644 --- a/fern/docs/pages/index.mdx +++ b/fern/docs/pages/index.mdx @@ -154,13 +154,12 @@ hide-nav-links: true

Release Highlights

-| Date | Update | API | -| --- | --- | --- | -| August 2026 | [ERC-7597 permits now supported for gasless approvals](https://docs.0x.org/changelog#2026-08-31-new-features) | Gasless API | -| August 2026 | [Across V4 no longer serves Solana or HyperCore routes](https://docs.0x.org/changelog#2026-08-31-breaking-changes) | Cross-Chain API | -| July 2026 | [Robinhood Chain (`4663`) is now generally available](https://docs.0x.org/changelog#2026-07-31-new-chains) | Swap API, Gasless API, Cross-Chain API | -| July 2026 | [kBTC and WBTC bridging added across 10+ chains](https://docs.0x.org/changelog#2026-07-31-new-features) | Cross-Chain API | -| July 2026 | [BStocks tokenized equities are now recognized and routable](https://docs.0x.org/changelog#2026-07-31-new-features) | Swap API, Token API | +| Date | Update | API | +| -------------- | ------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | +| September 2026 | [Arc (`5042`) is now supported across all three APIs](https://docs.0x.org/changelog#2026-09-30-new-chains) | Swap API, Gasless API, Cross-Chain API | +| September 2026 | [Arc's native USDC and ERC-20 USDC quote as separate assets](https://docs.0x.org/changelog#2026-09-30-new-features) | Swap API, Gasless API | +| August 2026 | [ERC-7597 permits now supported for gasless approvals](https://docs.0x.org/changelog#2026-08-31-new-features) | Gasless API | +| August 2026 | [Across V4 no longer serves Solana or HyperCore routes](https://docs.0x.org/changelog#2026-08-31-breaking-changes) | Cross-Chain API | Date: Tue, 20 Oct 2026 15:26:22 -0700 Subject: [PATCH 2/3] docs: remove RWA gating entry from September changelog --- fern/docs/changelog/2026-09-30.mdx | 1 - 1 file changed, 1 deletion(-) diff --git a/fern/docs/changelog/2026-09-30.mdx b/fern/docs/changelog/2026-09-30.mdx index 75651325..b254fbbe 100644 --- a/fern/docs/changelog/2026-09-30.mdx +++ b/fern/docs/changelog/2026-09-30.mdx @@ -41,4 +41,3 @@ tags: [] #### Breaking Changes - **Authorization failures in Cross-Chain API have their own error codes**: `/cross-chain/quotes` now returns `TAKER_NOT_AUTHORIZED_FOR_TRADE` or `RECIPIENT_NOT_AUTHORIZED_FOR_TRADE` (403) and `SELL_TOKEN_NOT_AUTHORIZED_FOR_TRADE` or `BUY_TOKEN_NOT_AUTHORIZED_FOR_TRADE` (422) where it previously returned `INPUT_INVALID`. -- **Reserve DTF tokens and PAXGy now require RWA access**: PHOTON, BUILDOUT, POWER, NEOCLOUD, and ROBOTS on BSC, and Paxos PAXGy, are gated behind the same opt-in as other tokenized real-world assets. Integrators without it are rejected on Swap, Gasless, and Cross-Chain requests. From a91df26635b8a64838413dc32018686fe929d080 Mon Sep 17 00:00:00 2001 From: Jessica Lin Date: Tue, 20 Oct 2026 15:40:21 -0700 Subject: [PATCH 3/3] docs: remove Arc USDC row from release highlights --- fern/docs/pages/index.mdx | 1 - 1 file changed, 1 deletion(-) diff --git a/fern/docs/pages/index.mdx b/fern/docs/pages/index.mdx index 50e31e79..d27a0a2e 100644 --- a/fern/docs/pages/index.mdx +++ b/fern/docs/pages/index.mdx @@ -157,7 +157,6 @@ hide-nav-links: true | Date | Update | API | | -------------- | ------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | | September 2026 | [Arc (`5042`) is now supported across all three APIs](https://docs.0x.org/changelog#2026-09-30-new-chains) | Swap API, Gasless API, Cross-Chain API | -| September 2026 | [Arc's native USDC and ERC-20 USDC quote as separate assets](https://docs.0x.org/changelog#2026-09-30-new-features) | Swap API, Gasless API | | August 2026 | [ERC-7597 permits now supported for gasless approvals](https://docs.0x.org/changelog#2026-08-31-new-features) | Gasless API | | August 2026 | [Across V4 no longer serves Solana or HyperCore routes](https://docs.0x.org/changelog#2026-08-31-breaking-changes) | Cross-Chain API |