Jito's Maker Priority Plugin Goes Live on Solana Exchange Archer
Jito's first BAM plugin is in use on Archer: market-maker transactions get deterministic priority — for tighter spreads and deeper liquidity in on-chain trading.
What Happened
Jito reported that its Maker Priority Plugin (MPP) is live on Archer — a spot exchange on Solana built on Jito’s infrastructure. The MPP is the first plugin for Jito’s Block Assembly Marketplace (BAM), the layer for programmable block construction on Solana.
What the Maker Priority Plugin Does
The problem it addresses: market makers on on-chain exchanges constantly risk being picked off by faster traders (“toxic flow”). To protect themselves, they quote wider spreads — which means worse prices for all users.
The MPP tackles this, per Jito’s technical introduction of the plugin:
- Dedicated channel: maker transactions run through a dedicated TPU port and are placed ahead of general transaction flow in regular intervals (50-millisecond batches) — regardless of competing fee bids.
- Quote deduplication: only the most recent quote update per market is scheduled; stale quotes are dropped.
- Goal: tighter spreads, deeper liquidity, and more efficient blocks — because market makers need to price in less of a safety buffer.
Context
With the go-live on Archer, the plugin gets its practical deployment on a trading venue. It is one building block in Jito’s broader BAM roadmap — most recently, Jito reported that more than half of validators run BAM (self-reported). For end users, the expected effect is indirect: better prices through tighter spreads, not a new interface.
Update (July 30, 2026): 17 Programs, Over $500 Million in Daily Volume
Three months after launch, BAM published a status report on the MPP. The key numbers per BAM:
- 17 programs are now enrolled — including BisonFi, Tessera, Scorch, ZeroFi, SolFi, and Archer. Together, the participants represent more than 500 million US dollars in daily spot trading volume.
- Around 35 percent of oracle updates from enrolled users during BAM slots now route through the MPP.
- The three largest market makers (Tessera, Scorch, BisonFi) land 5 to 10 MPP transactions per slot each, per BAM — roughly 21 per slot combined — at close to 100 percent success. Across all ingress paths, the same three reach roughly 31 updates per slot at a 76 percent success rate.
New features shipped alongside: multi-market updates (multiple markets in a single transaction), a transaction endpoint for tracking transaction events, a batch endpoint with timing information for a given batch auction, and a simulate endpoint for testing whether a transaction passes MPP validation. The MPP fee was lowered to 1 lamport per compute unit. As next steps, BAM names an intra-slot clock and broader user adoption.
What to Watch
- Whether measurably tighter spreads and deeper order books show up on the enrolled venues
- Which other exchanges or AMMs adopt the MPP
- Which further BAM plugins follow