MEXEM is the broker for the self-directed European investor who wants the widest possible bond selection — roughly 34,000 issues — with professional-grade analytics and low costs on small-to-medium trades. The trade-offs are a modest €20,000 investor-compensation cap and a commission that keeps climbing on large tickets.
MEXEM feels less like a slick consumer app and more like a professional dealing desk with a European front door. It borrows the full Interactive Brokers inventory and toolkit, then wraps them in local-language onboarding and support. That combination gives European bond buyers a genuinely institutional menu — but it comes with a safety net and a fee structure that reward some investors and penalise others. Here is who it fits, and who should look elsewhere.
MEXEM launched in 2018 and grew quickly into a pan-European broker. It is regulated by CySEC in Cyprus and is registered with several other European authorities, including the FCA, the AFM and the FSMA.
The detail that shapes everything is this: MEXEM is an introducing broker to Interactive Brokers. It handles onboarding, the client relationship and local-language support, while Interactive Brokers Ireland executes trades, clears them and holds client assets under Central Bank of Ireland supervision. Almost everything MEXEM offers a bond investor flows from that arrangement.
For a bond investor, that means the depth, pricing and platform come from Interactive Brokers, while the service layer — and the compensation scheme that sits behind the account — comes from MEXEM. Keeping those two layers separate is the key to understanding both its strengths and its limits.
The headline number is the draw: roughly 34,000 tradeable bonds, split about 30,000 corporate and 4,000 non-US sovereign.
The list spans multiple currencies and bond types — corporate, sovereign and supranational — and orders reach multiple exchanges as well as over-the-counter and electronic venues. Bonds can be bought in modest face-value lots rather than institutional blocks, which keeps the deep menu genuinely usable for a retail portfolio.
Against European peers, MEXEM competes on breadth rather than polish. An app-first broker might list a few hundred bonds in a clean interface; MEXEM lists tens of thousands behind a professional platform. If your requirement is “find a specific ISIN in a specific currency,” the range is the reason to be here.
Bond commissions are tiered and percentage-based: European bonds from 0.1% of trade value, US fixed income from 0.1% of face value, and Asia-Pacific from 0.08%, plus external fees. There is no custody or inactivity fee, and currency conversion is cheap at 0.05% with a roughly $5 minimum.
What that means at different ticket sizes:
| Trade size (European bond) | Commission (from 0.1%) | Cost as % of trade |
|---|---|---|
| €1,000 | ~€1 | 0.10% |
| €5,000 | ~€5 | 0.10% |
| €20,000 | ~€20 | 0.10% |
On a €1,000 ticket, around €1 is excellent — well below what a traditional bank would charge to buy a single bond. But because the percentage has no cap, the absolute cost scales straight up: a €20,000 trade runs about €20, and a large single-bond order can get expensive fast.
The comparison that matters is with Interactive Brokers itself, because MEXEM routes every order there. MEXEM’s bond commissions track the IBKR fixed-income tariff, so on the same European bond you pay roughly the same headline rate — from 0.1% of trade value — whether you deal through MEXEM or hold an account with Interactive Brokers directly. The difference shows up on large tickets: IBKR’s own published European-bond schedule tiers down to 0.025% on face value above €10,000, while MEXEM presents a flat 0.1% with no cap. On a €50,000 bond that gap is real — roughly €50 at MEXEM versus a lower, tiered figure direct with IBKR — on top of MEXEM’s “plus external fees” add-on, which makes the all-in number harder to predict before you trade.
The takeaway: for small-to-medium tickets the cost difference between MEXEM and a direct IBKR account is negligible, and MEXEM earns its layer through local-language support and localised tax reporting. For large or frequent single-bond orders, a direct Interactive Brokers account is cheaper and more transparent — so price-check the full cost of the ticket, not just the headline rate, before you buy.
Cheap on a €1,000 bond, pricey on a €50,000 one — with no cap, MEXEM’s commission is a small-ticket bargain and a large-ticket tax.
Behind MEXEM sits the full Interactive Brokers toolkit: ISIN search, a bond screener that filters on yield, maturity, rating and currency, yield-to-worst (YTW) analytics, and the complete set of order types across web, mobile and Trader Workstation.
It is powerful but technical. A seasoned investor will appreciate the depth; a first-time bond buyer will find it steep. This is a platform built for people who already know what a yield-to-worst is, not one that holds your hand while you learn.
MEXEM’s own contribution is the cushion: support in more than 10 languages, by phone, WhatsApp and email, that direct Interactive Brokers clients do not get. It softens the learning curve without smoothing it away entirely — the interface still fits an experienced self-directed investor far better than a beginner.
Client assets sit with Interactive Brokers Ireland, fully segregated and supervised by the Central Bank of Ireland — a strong custody setup. MEXEM itself is regulated by CySEC, a recognised but mid-tier European regulator.
Protection splits into two layers worth keeping separate:
That €20,000 ceiling is the clearest limitation on the account. It protects against firm failure, not market losses — but the low cap is a real consideration for anyone holding a large bond position with a single provider.
Cash is the disappointment: MEXEM pays no interest on uninvested balances in any currency, so coupon income and idle euros earn nothing while they sit — a genuine drag if you hold cash between trades.
Support and market breadth are the offsetting positives, with local-language service across several European countries backing a genuinely global inventory.
The quiet standout is tax reporting: localised, ready-to-use reports and assistance for markets including France, Spain, Italy and Belgium, a Tax Optimizer for lot-matching, and dividend and withholding breakdowns by country. For an investor filing in an EU jurisdiction, that can save real work at year-end.
The right fit is the self-directed European investor who wants the widest bond selection and professional analytics, trades small-to-medium tickets, and is comfortable with a technical platform. If that is you, few brokers give you more to work with for less.
The poor fit is anyone placing large single-bond orders (the uncapped commission bites), investors who want interest on cash, and conservative investors who need a six-figure compensation backstop. Those three limits show up fast, so it is worth being honest about them before you open an account.
How it stacks up when the requirement changes:
| If you want… | Best fit |
|---|---|
| The deepest bond menu with low small-ticket costs | MEXEM |
| The same inventory without the introducing-broker layer | Interactive Brokers (direct) |
| A more polished interface and a top-tier regulator with broader compensation | Saxo Bank |
| A simpler app and interest on cash (with a far smaller bond list) | Trade Republic |
Bondfish complements your broker by screening the full universe of bonds available across major brokers and helping you identify the best opportunities through independent analysis. With a 34,000-bond menu, that shortlist step is what turns raw range into a decision: screen by yield, maturity, currency and rating — and sanity-check the all-in cost of a trade — before you ever open the order ticket, so the uncapped commission and the compensation cap are choices you make on purpose rather than discover later.
MEXEM gives European retail investors one of the deepest bond universes available, professional-grade search and analytics, and genuinely low costs on small-to-medium tickets. The ceiling is a €20,000 compensation cap, an uncapped commission that punishes large single orders, and no interest on idle cash. Choose it if breadth and analytics matter most and you trade in modest lots; look elsewhere if you place big tickets, want interest on cash, or need a six-figure protection backstop.
This article is for general information only and is not investment advice. Bond investing involves risk, including possible loss of principal. Figures such as bond counts, fees, interest rates and protection limits can change — verify current terms with the broker before investing. Consider your own circumstances or consult a licensed financial professional before investing.
