/forex/compare
Prime of prime vs prime broker vs aggregator: how a new broker gets liquidity
A prime broker gives a firm direct, credit-backed access to top-tier bank liquidity, but expects size, capital and a credit record most new brokers do not have. A prime of prime is a non-bank firm that holds prime relationships and extends that access to smaller brokers against a margin deposit. An aggregator is technology, not a counterparty: it combines several price feeds into one order book. Most new brokers start with a prime of prime and a bridge or aggregator.
Key takeaways
- Prime broker and prime of prime are counterparty and credit decisions. An aggregator is a technology decision. You usually need one of the first two and often the third.
- A prime of prime exists because tier-1 prime brokerage is built for large financial clients. Smaller brokers reach the same banks one step removed.
- "Prime of prime" is used loosely in marketing. Ask whether the provider passes your flow to external liquidity or takes the other side itself.
- The cheapest-looking quote is rarely the cheapest model. Margin requirements, rejection rates under last look and connectivity fees decide the real cost.
At a glance
| Prime broker | Prime of prime | Liquidity aggregator | |
|---|---|---|---|
| What it is | A top-tier bank or dealer that lets a client trade with other dealers in the prime broker's name | A non-bank intermediary that holds prime relationships and extends access to smaller firms | Software that merges several price feeds into one book and routes orders |
| Is it your counterparty? | Yes, through give-up arrangements | Yes, you face the prime of prime's legal entity | No |
| Who it suits | Large brokers, funds, institutions | New and mid-sized brokers, prop firms | Any broker using more than one source |
| What you need | Significant capital, credit approval, volume | A margin deposit, onboarding checks, a technical connection | A bridge or platform connection, and sources to aggregate |
| How it is paid | Fees and minimums agreed with the bank | Commission per million traded, spread markup, or both, negotiated | Licence or usage fee |
How each one works
Prime broker
In FX, prime brokerage is intermediation by top-tier dealers for financial clients: the client trades with a range of dealers in the prime broker's name, and the prime broker takes on the credit relationship (BIS Quarterly Review, December 2019). It gives the best direct access to bank pricing, but the bank decides who qualifies, and new retail brokers rarely do.
Prime of prime
A prime of prime sits between a smaller broker and the banks. It has the size and credit standing for a prime brokerage relationship, and it offers access onwards to firms that cannot get one directly, usually against a margin deposit rather than a credit line. The label covers different business models: some providers route client flow to external liquidity, others hold some or all of the risk themselves. Industry coverage has warned buyers to check what a provider calling itself a prime of prime actually offers (FinanceFeeds; Euromoney).
Liquidity aggregator
An aggregator combines quotes from several liquidity sources into a single book, shows the best available bid and offer, and routes orders, including failover if one source drops. It is usually part of, or connected to, the bridge that links your trading platform to your liquidity. It does not extend credit or take the other side of your trades. The BIS describes retail FX flow reaching dealers through retail platforms and aggregators rather than directly (BIS, 2019).
Compared on what matters
| Decision factor | Prime broker | Prime of prime | Aggregator |
|---|---|---|---|
| Access requirements | Highest | Moderate | Technical only |
| Credit and collateral | Credit line from the bank | Margin deposit with the prime of prime | None |
| Who sets your price | Dealers you trade with | The prime of prime's pool, plus its markup | Whichever sources you connect |
| Execution control | High | Depends on the provider's model | High, within your sources |
| Counterparty exposure | To the prime broker | To the prime of prime's legal entity | None added |
| Technology work | FIX connectivity, usually through a bridge | FIX or a bridge connection, often supported by the provider | Integration with your platform and each source |
| Typical first step for a new broker | Rarely available | Common | Added when you use more than one source |
Which one fits
Choose a prime broker if
You already have the capital, volume and credit standing a tier-1 bank expects, and you want to trade directly in the bank's name. For most new retail brokers this is a later step, not a starting point.
Choose a prime of prime if
You need institutional pricing without bank-level credit, you want one onboarding and one legal counterparty, and you can post margin. Most new brokers and prop firms start here.
Add an aggregator if
You use, or plan to use, more than one liquidity source and want best-price routing, comparison across sources and failover. With a single source an aggregator adds little.
Questions to ask any liquidity provider before you sign
- Which legal entity will I face, who regulates it, and how is my margin held?
- Do you pass my flow to external liquidity, internalise it, or both? Under what conditions?
- Which banks and non-bank firms are in your pool, by name?
- What is your last-look policy, and what were my reject rates in the trial?
- How is pricing charged: commission per million, markup, or both? What are the minimums?
- How do I connect: FIX API, a bridge you support, or a platform plugin? Who supports it at 3 a.m. on a Sunday open?
- Which instruments and trading hours are covered, including holidays and crypto CFDs?
- Can you support my regulatory reporting, for example delegated EMIR reporting? (See our PS26/15 explainer.)
- What happens to my flow if you classify it as toxic, and who decides?
FAQ
Is a prime of prime the same as a liquidity provider?
Not quite. "Liquidity provider" is the broad term for any firm that prices and fills your hedge trades. A prime of prime is one kind: a non-bank intermediary that extends prime-style access to smaller brokers. Some liquidity providers are banks or market makers; some are prime of primes.
Can a new broker go straight to a prime broker?
Rarely. Prime brokers set capital, volume and credit thresholds that most new retail brokers do not meet. The usual path is a prime of prime first, then a direct prime relationship once volumes and balance sheet justify it.
Do I need an aggregator if I use one prime of prime?
Usually not at the start. An aggregator earns its cost when you connect two or more sources and want best-price routing and failover. Your bridge may already include aggregation features.
Does a prime of prime take the other side of my trades?
Some do and some do not. The label does not tell you. Ask whether your flow is passed to external liquidity, internalised, or both, and get the answer in the agreement.
Sources
- Bank for International Settlements, "Sizing up global foreign exchange markets", BIS Quarterly Review, December 2019. https://www.bis.org/publ/qtrpdf/r_qt1912f.htm (accessed 2026-11-03)
- FinanceFeeds, "What exactly is a prime of prime? Live from iFX EXPO, Limassol, Cyprus". https://financefeeds.com/exactly-prime-prime-live-ifxexpo-limassol-cyprus/ (accessed 2026-11-03)
- Euromoney, "FX: Brokers cannot afford an identity crisis". https://www.euromoney.com/?p=8877 (accessed 2026-11-03)
Last verified: 3 November 2026. This page explains market structure; it is not investment, legal or regulatory advice. Corrections: corrections@roteiro.consulting
Cite this page
Prime of prime vs prime broker vs aggregator: how a new broker gets liquidity. Roteiro. https://roteiro.consulting/forex/compare/prime-of-prime-vs-prime-broker-vs-aggregator. Last verified 3 November 2026.