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Accounting · head to head

Modern Treasury vs Mollie

Modern Treasury logo

Modern Treasury

Accounting

Payment operations and ledger infrastructure that sits between your product and your own bank accounts

From
On request
Rated
-
Full reviewWebsite
Mollie logo

Mollie

E-Commerce

European payment service provider with published per-transaction rates and no monthly fee on the online plan

From
£0.3/transaction
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Modern Treasury you must already have or be able to obtain your own bank accounts with the right connectivity, so early stage companies without a banking relationship cannot use it and are pushed towards a sponsor bank model instead.; Mollie non-European cards cost 3.25% plus 20p against 1.20% plus 20p for UK domestic consumer cards, so a merchant with significant traffic from the US or Asia pays close to triple the domestic rate on that revenue.
  • They diverge on capability: Modern Treasury covers Multi-rail payment initiation, Mollie covers Local payment methods.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Modern Treasury and Mollie actually diverge.

Attributes where Modern Treasury and Mollie differ
AttributeModern TreasuryMollie
Starting priceOn request£0.3/transaction
Pricing modelquotePer transaction by payment method
PlatformsWebWeb, iOS, Android, API
CategoryAccountingE-Commerce

Identical on both: free tier (No), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Modern Treasury

  • Multi-rail payment initiation
  • Bank connectivity
  • Ledgers
  • Automatic reconciliation
  • Approval workflows
  • Virtual accounts
  • Compliance tooling
  • Return and exception handling

Only in Mollie

  • Local payment methods
  • Published rate card
  • Hosted checkout and payment links
  • Subscriptions API
  • Point of sale terminals
  • Plugin ecosystem
  • Multicurrency settlement

What people use each for

The jobs each tool is most often brought in to do.

Modern Treasury

  • A marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by handnot Mollie
  • A lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accountsnot Mollie
  • A company that wants to move off a banking as a service provider and hold its own bank accounts after seeing sponsor banks offboard fintech programmesnot Mollie
  • An insurer handling premium collection and claims payment across several rails with approval controls and an auditable trailnot Mollie

Mollie

  • A Dutch or Belgian shop where most customers pay by iDEAL or Bancontact and the flat 30p beats a percentage rate on high-value basketsnot Modern Treasury
  • A small merchant that wants published pricing rather than a sales call before it can model card costsnot Modern Treasury
  • A subscription business in the EEA collecting by SEPA Direct Debit mandate instead of cardnot Modern Treasury
  • A marketplace or platform that needs one integration covering the main European local methodsnot Modern Treasury

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Modern Treasury

  • You must already have or be able to obtain your own bank accounts with the right connectivity, so early stage companies without a banking relationship cannot use it and are pushed towards a sponsor bank model instead.
  • Pricing rests on an annual minimum commitment, and companies that miss their volume forecast pay the minimum regardless, which makes the headline per-transaction rate close to irrelevant in year one.
  • Supported bank connectivity is a finite list, so if your bank is not on it you are either waiting for an integration or changing banks, which is a far larger project than adopting the software.
  • It is software over banking, not banking, so it does not solve card issuing, deposit accounts or the licensing questions that a company embedding financial products still has to answer elsewhere.
  • The ledger is genuinely good but adopting it properly means making it the source of truth for balances in your product, which is a significant application change rather than a payments integration and is where implementations run long.

Mollie

  • Non-European cards cost 3.25% plus 20p against 1.20% plus 20p for UK domestic consumer cards, so a merchant with significant traffic from the US or Asia pays close to triple the domestic rate on that revenue.
  • Coverage is built around European methods, so if you expand into Latin America or Southeast Asia you will need a second processor and a second reconciliation process rather than extending Mollie.
  • The in-person Pro plan requires a one-year contract and charges 20 pounds a month per additional terminal, so a shop with four tills pays 80 pounds a month in terminal fees before any transaction cost.
  • Mollie offers no interchange-plus option publicly, so large merchants cannot see or benefit from falling interchange the way they could on a cost-plus contract with an acquirer.
  • The developer tooling and reporting are lighter than the largest processors, so finance teams that want detailed fee breakdowns or granular reconciliation exports often end up building that layer themselves.

Pricing, plan by plan

Modern Treasury

On request
  • Modern Treasury Platform$undefined/year
    • Platform access fee covering API, dashboard, infrastructure and support
    • Usage-based fees across ACH, wires, RTP, FedNow, push to card, cheques and stablecoins
    • A single annual minimum commitment that both platform and usage fees count towards

Mollie

£0.3/transaction
  • Online paymentsFree
    • No monthly fee
    • UK domestic consumer cards 1.20% + 20p
    • European and commercial cards 2.90% + 20p
  • In person, pay as you goFree
    • No monthly commitment
    • Per-transaction terminal rates
    • One terminal
  • In person, Pro$20/month
    • Lower per-transaction terminal rates
    • One-year contract required
    • Each additional terminal 20 pounds per month

Which should you pick?

Choose Modern Treasury if

  • You need multi-rail payment initiation.
  • You also want bank connectivity.
Modern Treasury review

Choose Mollie if

  • You need local payment methods.
  • You work on Web, iOS, Android, API.
  • You also want published rate card.
Mollie review

Questions people ask

Is Modern Treasury or Mollie better?
Neither clearly leads. Modern Treasury starts at On request and Mollie at £0.3/transaction, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Modern Treasury or Mollie?
Modern Treasury starts at On request and Mollie at £0.3/transaction.
Does Modern Treasury or Mollie run on more platforms?
Modern Treasury runs on Web. Mollie runs on Web, iOS, Android, API.
What is Modern Treasury best used for?
Modern Treasury is most often used for a marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by hand, a lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accounts, a company that wants to move off a banking as a service provider and hold its own bank accounts after seeing sponsor banks offboard fintech programmes, an insurer handling premium collection and claims payment across several rails with approval controls and an auditable trail. Of those, a marketplace paying out to thousands of sellers that needs a ledger its application can trust rather than reconciling a payments dashboard by hand and a lender originating and servicing loans that must track disbursements, repayments and returns against its own bank accounts are not what Mollie is typically brought in for.
What can Modern Treasury do that Mollie cannot?
Modern Treasury covers Multi-rail payment initiation, Bank connectivity, Ledgers, Automatic reconciliation. Mollie covers Local payment methods, Published rate card, Hosted checkout and payment links, Subscriptions API.

Answered from the vendors’ own pages

Modern Treasury: Is Modern Treasury a bank or a banking as a service provider?

Neither. You hold your own bank accounts and it is software over them. That avoids sponsor bank concentration risk but means you need the bank relationship yourself.

Mollie: Does Mollie charge a monthly fee?

Not on the online payments plan. You pay only per successful transaction. In-person Pro is 20 pounds a month.

Modern Treasury: What does it cost?

Not published. A platform access fee plus usage fees across rails, on an annual term with a single minimum commitment. Negotiate the minimum, not the per-transaction rate.

Mollie: Is iDEAL really a flat fee?

Yes, 30p per transaction regardless of the amount, which is why it is cheaper than cards on high-value baskets.

Modern Treasury: Which rails are supported?

ACH, wires, RTP, FedNow, push to card, cheques and stablecoin payments, subject to what your bank supports.

Mollie: Can I use Mollie outside Europe?

You can accept non-European cards but at 3.25% plus 20p, and merchant accounts are aimed at European businesses. It is not a global processor.

Modern Treasury: Do we still need our own compliance programme?

Yes. KYB, KYC and transaction monitoring are included in the platform, but you are the one holding the accounts and the regulatory obligation sits with you and your bank.

Mollie: Does Mollie do interchange plus?

Not publicly. The published rates are blended, so falling interchange does not flow through to you automatically.

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