Across Protocol (ACX): how it works, supply and reviews

Status update

ACX sunset: Across says the protocol has been transferred to a new company, Across, Inc. (AcrossCo), and that ACX is sunsetting; after 8 January 2027 all ACX tokens are deprecated. source ↗
Holder options: Until 8 January 2027 holders may exchange ACX for AcrossCo equity securities or for USDC, both valued at $0.04375 per token, according to the notice. This is not investment advice. source ↗

As of 1 November 2026, from the company’s own announcements unless stated otherwise.

In short

Type: Intents-based interoperability protocol: an RFQ layer, third-party relayers with offchain liquidity, and optimistic settlement.
Maximum supply: ACX has a fixed supply of 1 billion tokens, minted on Ethereum.
Risks and caveats: ACX is being deprecated: after 8 January 2027 it has no governance, utility or economic function, and the exchange options close.
Checked: 1 November 2026

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On-chain stablecoin data

Stablecoins held in its contracts (floor): At least US$2.20 m, read on 7 of its 7 contracts on 1 November 2026
Stablecoin flows, 7 days (25 October 2026 – 31 October 2026): Locked US$119.62 m, released US$119.46 m, net +US$0.15 m

On-chain measurement by Stablecoin Scanner (ACHIVX), not a reserve or solvency claim. As of 31 October 2026. For a bridge the scanner counts a lock as inflow and a release as outflow; its set is the contracts named by the bridge’s own deployment list or L2BEAT. scanner page ↗

Key facts

Ticker: ACX
Official site: across.to

Key facts checked on 1 November 2026 against official sources.

What is Across Protocol

Across is a crosschain interoperability protocol: relayers deliver a user's tokens on the destination chain from their own funds and are repaid later through settlement on Ethereum. Settlement uses optimistic verification with bonds and UMA's oracle as the dispute layer.

Network and consensus

Network and consensus — Across Protocol
Parameter	Details
Type	Intents-based interoperability protocol: an RFQ layer, third-party relayers with offchain liquidity, and optimistic settlement.
Supported chains	The docs state support for 24 chains (another docs page says '23+ mainnet chains and 8 testnet chains').
Verification	Bundles of fills are proposed with a bond and accepted unless someone disputes them; one honest disputer is enough.
Bonds	The dataworker posts a bond in ABT (Across Bond Token) when proposing a bundle on Ethereum.
Dispute resolution	Disputed bundles go to UMA's Data Verification Mechanism, where UMA token holders vote.
Versions	V1 launched in 2021, V2 in June 2022 and V3 (intents) in February 2024.
Interface	Risk Labs' terms say it does not control or operate any version of the protocol.

Supply and issuance

Supply and issuance — Across Protocol
Parameter	Details
Maximum supply	ACX has a fixed supply of 1 billion tokens, minted on Ethereum.
Token sunset	ACX is sunsetting; after 8 January 2027 all ACX tokens are deprecated.
Holder options	Until 8 January 2027 holders may exchange ACX for AcrossCo equity securities or for USDC, both valued at $0.04375 per token.

What ACX is used for

ACX was the governance token: holders controlled protocol parameters, upgrades and DAO treasury management.
ACX holders could vote on activating a fee switch.
After 8 January 2027 ACX has no governance, utility or economic function.

Who develops and governs Across Protocol

Company: Across Protocol has been transferred to Across, Inc. (AcrossCo).
Legal entity: The app's terms of service are an agreement with Risk Labs and are governed by New York law.
Developer: Across was built mainly by Risk Labs, the foundation that supports UMA.
Governance: 'The Bridge Across' (Risk Labs, March 2026) proposed moving from a token DAO to a private U.S. C-corp; the docs say it passed its Snapshot vote.
Open source: Across contracts and off-chain code are publicly verifiable and in scope of the bug bounty.

History

History — Across Protocol
Date	Event
24 October 2021	Across Protocol was announced, with a public launch set for 8 November.
8 November 2021	Across launched on mainnet, bridging USDC, ETH and UMA from Arbitrum to Ethereum.
June 2022	Across V2 launched.
21 February 2024	Across V3 introduced an intents-based design (Across Settlement, Across+).
11 March 2026	Risk Labs posted 'The Bridge Across', proposing an ACX token-to-equity exchange and buyout.
17 September 2026	Across announced the protocol's transfer to Across, Inc. and the ACX sunset, with options closing 8 January 2027.

Security and audits

Across was audited by OpenZeppelin at launch; the docs list Across and UMA audit references.
Across runs a bug bounty covering its smart contracts and off-chain code.
Across says no user funds have been lost.
In 2025 an upgrade mistake locked LP funds in the Lens SpokePool and paused Lens routes for 3-4 days; Risk Labs refunded the pools.

Security incidents

Security incidents — Across Protocol
Date	What happened	Source
3 September 2025	Outage: An operational mistake during a Lens SpokePool upgrade (a compiler mismatch on the zkStack chain) made the contract unusable and temporarily locked LP funds. Bridging to and from Lens was paused for 3-4 days; Risk Labs redeployed and funded new Lens pools. Across says it was not a hack, exploit or security vulnerability. Funds returned: Across says no user funds were at risk; the locked funds are recoverable through zkSync governance and go back to Risk Labs, which covered LPs.	across.to

Further incidents are reported by third parties (press, incident databases) but are not confirmed in the company’s own channels, so they are not listed here.

Official ACX contracts

Official ACX contracts
Network	Contract address
Ethereum	0x44108f0223A3C3028F5Fe7AEC7f9bb2E66beF82F

ACX is an ERC-20 token on Ethereum; Etherscan labels the contract 'Across Protocol Token (ACX)'. ACX is being sunset (deprecated after 8 January 2027).

Risks and caveats

ACX is being deprecated: after 8 January 2027 it has no governance, utility or economic function, and the exchange options close.
Settlement security relies on at least one honest party disputing invalid bundles and on UMA's token-holder vote.
Some exchanges may delist ACX during the transition, per Risk Labs.
Risk Labs' terms say it does not control or operate the protocol; the app's terms are under New York law.

Official links

Website: across.to
Docs: docs.across.to
Source code: github.com/across-protocol
Blog: across.to/blog
Governance forum: forum.across.to
Block explorer: etherscan.io/token/0x44108f0223a3c3028f5fe7aec7f9bb2e66bef82f

Questions and answers

What is Across Protocol?

Across is a crosschain interoperability protocol where relayers fill transfers from their own funds and are repaid through optimistic settlement on Ethereum, secured by bonds and UMA's oracle.

Who runs Across?

Across was built mainly by Risk Labs; the protocol has been transferred to a new company, Across, Inc. (AcrossCo).

What happens to the ACX token?

ACX is sunsetting: until 8 January 2027 holders can exchange it for AcrossCo equity or USDC at $0.04375 per token; after that date ACX has no governance, utility or economic function.

How many chains does Across support?

The docs state support for 24 chains.

Has Across been hacked?

Across says no user funds have been lost. It published a report on a 2025 Lens upgrade mistake that paused Lens routes for 3-4 days.

Sources

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Page updated: 2026-11-01