Skip to content

Notice for the PGA transition and the Fast Feed #3567

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
anegg0 wants to merge 3 commits into
base: fast-feed
Choose a base branch
from
+97 −0
Draft

Notice for the PGA transition and the Fast Feed #3567

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
5940698
Add notice for the PGA transition and the Fast Feed
anegg0 Sep 5, 2026
7fc9157
Link the specific audit reports in the PGA and Fast Feed notice
anegg0 Sep 5, 2026
ea36a80
Merge branch 'fast-feed' into pga-fast-feed-notice
anegg0 Sep 11, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
92 changes: 92 additions & 0 deletions docs/notices/pga-fast-feed-notice.mdx
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,92 @@
---
title: 'Notice for the PGA transition and the Fast Feed'
description: What changes for Timeboost users, searchers, and integrators when Arbitrum One moves to Priority Gas Auctions and the Fast Feed goes live
user_story: As a Timeboost user, searcher, or integrator on Arbitrum One, I want to know what changes when PGA and the Fast Feed activate, and what I must do before then.
content_type: notice
---

The ArbitrumDAO is voting on one Constitutional proposal that combines two changes to <a data-quicklook-from="arbitrum-one">Arbitrum One</a>: replacing <a data-quicklook-from="timeboost">Timeboost</a> with Priority Gas Auctions (PGA), and establishing the <a data-quicklook-from="fast-feed">Fast Feed</a>. The same proposal sunsets Timeboost on <a data-quicklook-from="arbitrum-nova">Arbitrum Nova</a> without adopting PGA there.

The onchain vote opened on August 20, 2026 on Alt Arbitrum Gov. Both components passed separate Snapshot temperature checks before they were combined.

<VanillaAdmonition type="warning" title="Action required for Timeboost users">

If you hold funds in the Timeboost <a data-quicklook-from="auction-contract">auction contract</a> on Arbitrum One or Arbitrum Nova, withdraw them. You can withdraw at any time, including today.

If you submit transactions to the <a data-quicklook-from="express-lane">express lane</a> endpoint, migrate to standard transaction submission. The endpoint is decommissioned when the change activates, and it rejects transactions after that.

</VanillaAdmonition>

## No activation date is set

The proposal grants authority to activate. It does not itself switch anything on.

Priority fee collection is controlled by a `TipCollectionToggler` contract, through an `ArbOwner` precompile call to `setCollectTips`. Offchain enables PGA and priority fee collection after the vote executes onchain and system testing concludes, and holds that authority for two years. The Fast Feed waits on a separate track: the Arbitrum Treasury Management (ATM) Council and OAT must select the stablecoin used for payment before the Fast Feed Payment Contract can deploy.

Neither track has a published date. The two activate independently, so PGA and the Fast Feed can go live on different days.

Watch the [PGA proposal thread](https://forum.arbitrum.foundation/t/constitutional-aip-transition-arbitrum-one-ordering-policy-to-priority-gas-auctions-pga/30942) and the [Fast Feed proposal thread](https://forum.arbitrum.foundation/t/constitutional-aip-fast-feed/31003) for the announcement.

## What changes when PGA activates

On the day PGA activates, Timeboost ends on Arbitrum One and Arbitrum Nova:

- The <a data-quicklook-from="autonomous-auctioneer">autonomous auctioneer</a> stops accepting bids.
- The express lane endpoint is decommissioned and rejects any transaction sent to it.
- The <a data-quicklook-from="sequencer">Sequencer</a> stops applying the 200ms delay to transactions outside the express lane. That delay only applied while an <a data-quicklook-from="express-lane-controller">express lane controller</a> held the round.
- Funds locked in the auction contract remain withdrawable.

Arbitrum One then orders transactions by the <a data-quicklook-from="priority-fee">priority fee</a> on each transaction, in 125ms rounds inside a 250ms block, with ties broken by arrival time. An anti-starvation boost raises the queue position of transactions still waiting after each round, so transactions that pay no priority fee are still included within a small number of blocks.

Arbitrum Nova returns to first-come, first-served ordering. Nova does not adopt PGA.

## Actions by audience

| Audience | Action |
| ----------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| Timeboost bidders on One or Nova | Withdraw auction contract deposits and stop using the express lane endpoint |
| <a data-quicklook-from="searcher">Searchers</a> | Bid by setting `maxPriorityFeePerGas` on standard EIP-1559 type 2 transactions, as on other EVM chains |
| Wallets and apps | None. Transaction formats do not change |
| Everyday users | None. Ordering, inclusion, and fees for transactions that pay no priority fee are unaffected |
| Node operators | None for PGA itself. Confirm your chain runs <a data-quicklook-from="arbos">ArbOS</a> 61 or newer, which supports priority fee collection |
| Arbitrum chain operators | None. PGA is opt-in per chain and this proposal applies only to Arbitrum One and Arbitrum Nova |

## Governance timeline

Only confirmed dates appear below.

| Date | Event |
| ------------------- | ------------------------------------------------------------------------ |
| June 3, 2026 | PGA proposal posted to the Arbitrum governance forum |
| June 18 to 25, 2026 | PGA Snapshot temperature check, passed |
| June 19, 2026 | Fast Feed proposal posted to the forum |
| July 2026 | Fast Feed Snapshot temperature check, passed |
| July 28, 2026 | PGA proposal amended: activation moved behind the `TipCollectionToggler` |
| August 17, 2026 | Both proposals consolidated into one Constitutional AIP and one payload |
| August 20, 2026 | Consolidated onchain vote opened on Alt Arbitrum Gov |

Execution follows the waiting periods set out in the ArbitrumDAO Constitution. Activation follows execution, on the schedule described above.

## Revenue

Priority fees collected under PGA and subscription proceeds from the Fast Feed both split 97% to the ArbitrumDAO Treasury and 3% to the Arbitrum Developer Guild, following the split ratified for Timeboost.

The two use different mechanisms. Fast Feed proceeds route through a dedicated RewardDistributor contract and emit an onchain event for each payment. Priority fees arrive bundled with other transaction fees, so the <a data-quicklook-from="arbitrum-dao">Arbitrum DAO</a> accounts for them periodically and distributes them through a separate vote every six months.

Trail of Bits audited each contract involved. The summary reports are published here:

| Contract | Audit report | Date |
| -------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- | ---------- |
| `TipCollectionToggler` | [Tip Collection Toggler](../hosted-pdfs/audit-reports/2026_08_14_trail_of_bits_tip_collection_toggler_final_summary_report.pdf) | 08/14/2026 |
| Fast Feed Payment Contract | [Sequencer Feed Ticketing](../hosted-pdfs/audit-reports/2026_07_31_sequencer_feed_ticketing_summary_report.pdf) | 07/31/2026 |
| RewardDistributor | [Reward Distributor Fixes](../hosted-pdfs/audit-reports/2026_06_16_trail_of_bits_security_audit_reward_distributor_fixes_summary_report.pdf) | 06/16/2026 |

The Fast Feed Payment Contract is audited under the name "Sequencer Feed Ticketing". For every Arbitrum audit, see the [security audit reports page](/audit-reports).

Contract addresses are published in the Arbitrum One developer documentation after deployment.

## Learn more

- [Introduction to PGA](/how-arbitrum-works/priority-gas-auction/pga) explains rounds, ordering, and the anti-starvation boost.
- [Introduction to the Fast Feed](/how-arbitrum-works/priority-gas-auction/fast-feed) covers what the feed publishes and how subscription access works.
- The [Arbitrum DAO network upgrades table](https://docs.arbitrum.foundation/network-upgrades) records execution timestamps.
5 changes: 5 additions & 0 deletions sidebars.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1874,6 +1874,11 @@ const sidebars = {

// Notices sidebar
noticeSidebar: [
{
type: 'doc',
id: 'notices/pga-fast-feed-notice',
label: 'Notice for PGA and the Fast Feed',
},
{
type: 'doc',
id: 'notices/arbos61-upgrade-notice',
Expand Down