What a liquidity provider actually does
A liquidity provider (LP) streams tradable bid and offer prices to a broker or fund and stands ready to fill orders against them. For a retail-facing or institutional broker, the LP is the source of the prices clients trade on and the venue where the broker offsets or passes through that flow. A single LP might be one bank, one non-bank market maker or an ECN; an aggregated provider such as a Prime of Prime blends many of these into one deep feed.
Because the LP sits at the centre of pricing, execution quality, credit and reporting, choosing one is closer to selecting core infrastructure than picking a vendor on price alone. The right choice shows up as consistent fills and stable spreads when markets move; the wrong one shows up as rejects, slippage and reconciliation headaches at exactly the wrong moment.
The selection criteria: a broker's checklist
Use the criteria below as a structured checklist. Weight each one against your own asset classes, volumes and client base — a crypto-CFD broker and a multi-asset institutional desk will not rank them identically, but all of them matter.
| Criterion | Why it matters | Questions to ask |
|---|---|---|
| Book depth | Determines how much size you can execute without moving the price or getting partial fills. | How deep is the book at each tier? Does depth hold in fast markets and around news? |
| Tier 1 + non-bank mix | A blend of bank and non-bank sources delivers tighter, more resilient pricing than any single feed. | Which bank and non-bank sources back the feed? Is it a single stream or genuinely aggregated? |
| True STP / no conflict | A provider running a dealing desk against your flow has an interest in your losses. | Is flow routed straight through? Do you take the other side of client orders? |
| Asset coverage | One relationship across FX, metals, indices, commodities, equities and CFDs simplifies operations. | Which instruments are covered on the same feed and credit line? |
| Technology & connectivity | FIX API and platform bridges decide how cleanly the feed drops into your stack. | Do you support FIX API, MT4/MT5 and cTrader bridges? What is typical latency and where are you colocated? |
| Risk tools | Real-time exposure and margin controls let you manage risk before it becomes a loss. | What live risk, margin and exposure controls are provided? Are they configurable? |
| Reporting | Consolidated P&L and trade reporting supports your own risk and compliance obligations. | What reporting is provided, in what format, and can you reconcile fills independently? |
| Credit terms | Credit and margin arrangements determine how much capital you must post to trade at size. | How is credit structured? Is it intermediated, so you avoid a direct bank facility? |
| Support | An institutional desk resolves connectivity and execution issues faster than a ticket queue. | Is there a dedicated relationship and desk coverage across your trading hours? |
| Regulation & reputation | A credible, well-regarded counterparty reduces operational and settlement risk. | What is the entity's standing, track record and reputation among peers? |
Illustrative, structural checklist. The right weighting depends on your entity type, asset classes, volumes and connectivity.
Depth and pricing over the headline spread
The most common mistake is to rank providers on the tightest advertised spread. A tight top-of-book on a quiet morning tells you little about how the book behaves when you need to execute size, or when volatility spikes around a data release. Ask for depth at multiple tiers and, ideally, evidence of behaviour under stress. A slightly wider spread that holds through a news event is worth far more than a razor-thin quote that vanishes.
True STP and the conflict question
Whether the provider runs a dealing desk against your flow is not a technical detail — it is a question of alignment. A pure straight-through-processing provider routes your orders to underlying venues and earns from commission or a transparent markup, not from your clients' losses. Establish clearly whether the counterparty ever takes the other side of your flow, and how it earns.
Technology, risk and reporting
The feed has to reach your platform cleanly. Confirm support for the connectivity you use — FIX API, an MT4/MT5 bridge or cTrader — along with realistic latency and colocation. Then look at the controls that sit on top: real-time risk and margin tools, and consolidated P&L reporting you can reconcile independently. Weak reporting turns into compliance and reconciliation problems later.
Red flags to avoid
- An undisclosed dealing desk. If a provider is evasive about whether it takes the other side of your flow, treat that as a conflict until proven otherwise.
- Spreads that look too good. Headline pricing with no depth behind it, or that widens sharply the moment you trade size, signals a thin or last-look-heavy book.
- Opaque last look and rejects. High or unexplained rejection rates, and vague answers on last look, point to execution you cannot rely on.
- A single source dressed up as "aggregation." Ask which banks and non-bank venues actually back the feed.
- No independent reporting. If you cannot reconcile fills yourself, you cannot properly manage risk or compliance.
- A thin or unverifiable entity. No track record, unclear regulatory standing and no references are reasons to slow down.
How a Prime of Prime fits
Many of these criteria — aggregated depth from multiple bank and non-bank sources, tier 1 credit, full STP, multi-asset coverage, execution technology and risk reporting — are exactly what a Prime of Prime (PoP) is built to deliver through a single relationship. Rather than negotiating, integrating and maintaining several bilateral bank facilities, a broker connects once and consumes one aggregated feed with credit intermediated on the PoP's own prime brokerage relationships. For a fuller comparison of the layers, see prime broker vs prime of prime vs retail broker, and the glossary for the terms used here.
A PoP does not remove the need to run the checklist — you should still test depth, STP, technology and reputation — but it does mean one strong relationship can satisfy most of it at once.