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APIs · head to head

Basis Theory vs Klarna

Basis Theory logo

Basis Theory

APIs

Developer tokenisation platform that holds card and sensitive data inside a PCI Level 1 environment you do not operate

From
$995/month
Rated
-
Full reviewWebsite
Klarna logo

Klarna

E-Commerce

Buy now pay later and instalment checkout for online and in-store merchants

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Basis Theory the Starter plan is 995 US dollars a month before any volume, which is a real floor for an early stage company and puts the product out of reach of teams tokenising a few thousand records.; Klarna merchant fees for the short-term products run around 5.99% plus a fixed fee in the United States, roughly double a standard card rate, so unless Klarna measurably lifts average order value or conversion it is a straight margin loss.
  • They diverge on capability: Basis Theory covers Tokenisation API, Klarna covers Pay in 4.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Basis Theory and Klarna actually diverge.

Attributes where Basis Theory and Klarna differ
AttributeBasis TheoryKlarna
Starting price$995/monthOn request
Pricing modelPer month by token volumequote
PlatformsWeb, iOS, Android, LinuxWeb, iOS, Android
CategoryAPIsE-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 Basis Theory

  • Tokenisation API
  • Hosted elements
  • Outbound proxy
  • PCI attestation of compliance
  • Processor portability
  • Reactors
  • Access controls and audit
  • PII and PHI options

Only in Klarna

  • Pay in 4
  • Pay in 30 days
  • Longer-term financing
  • Klarna app placement
  • Klarna Checkout
  • In-store payments
  • On-site messaging
  • Merchant portal

What people use each for

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

Basis Theory

  • A payments company that wants card on file without bringing its own infrastructure into PCI scope and paying for the assessment that followsnot Klarna
  • A merchant locked into a processor by that processor vault that wants to hold its own tokens and route to more than one acquirernot Klarna
  • A fintech collecting bank account and identity data that needs it isolated from its application database before an enterprise security reviewnot Klarna
  • A team that needs to send stored card data to a third party for a one-off integration without that data traversing its own serversnot Klarna

Klarna

  • A fashion or furniture retailer with average order values high enough that a 3% fee uplift is repaid by a larger basketnot Basis Theory
  • A merchant selling to younger shoppers who have low credit card penetration and would otherwise abandon at checkoutnot Basis Theory
  • A European retailer wanting a single hosted checkout that handles instalments, invoice and card in one flownot Basis Theory
  • A brand that wants distribution inside Klarna's shopping app as an acquisition channel rather than only a payment optionnot Basis Theory

Where each one falls short

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

Basis Theory

  • The Starter plan is 995 US dollars a month before any volume, which is a real floor for an early stage company and puts the product out of reach of teams tokenising a few thousand records.
  • Starter is limited to the US region, so a company with European data residency requirements is pushed into a quoted Scale or Enterprise agreement immediately.
  • Log retention on Starter is 24 hours, which is well below what most security teams expect for a system holding cardholder data and forces an upgrade for reasons unrelated to volume.
  • Migrating away means moving card data out of the vault, which requires processor and assessor involvement and is slow, so the portability argument that attracts buyers cuts against them at exit.
  • An attestation of compliance covers the vendor environment, not your assessment; your assessor still decides what is in scope, and buyers occasionally discover their integration pattern pulled systems back into scope anyway.

Klarna

  • Merchant fees for the short-term products run around 5.99% plus a fixed fee in the United States, roughly double a standard card rate, so unless Klarna measurably lifts average order value or conversion it is a straight margin loss.
  • Rates are negotiated and unpublished, which means small merchants pay the standard rate while large ones negotiate down, and you cannot benchmark what you are being charged without going to market.
  • Returns and partial refunds are handled through Klarna's systems rather than your payment processor, so your finance team reconciles a second settlement flow and customer service handles a second dispute process.
  • Buy now pay later is being brought under consumer credit regulation in the UK, the EU and Australia, which is already changing affordability checks and disclosures; the checkout experience that converts today may be legally required to add friction.
  • Klarna owns the post-purchase relationship, sending payment reminders and marketing in its own name, so a shopper who has a poor collections experience associates it with your brand while you have no control over the messaging.

Pricing, plan by plan

Basis Theory

$995/month
  • Starter$995/month
    • 20,000 tokens included
    • Production PCI Level 1 environment
    • US region only
  • Scale$undefined/month
    • Quoted
    • Higher token volumes
    • Additional regions
  • Enterprise$undefined/month
    • Quoted
    • Additional compliance options for PII and PHI
    • Responses for 95 percent of PCI SAQ D

Klarna

On request
  • Klarna for Business$undefined/year
    • Per-transaction percentage plus a fixed fee, negotiated by merchant
    • No published rate card; rates vary by market, product and volume
    • Short-term products priced materially above card interchange

Which should you pick?

Choose Basis Theory if

  • You need tokenisation api.
  • You work on Web, iOS, Android, Linux.
  • You also want hosted elements.
Basis Theory review

Choose Klarna if

  • You need pay in 4.
  • You work on Web, iOS, Android.
  • You also want pay in 30 days.
Klarna review

Questions people ask

Is Basis Theory or Klarna better?
Neither clearly leads. Basis Theory starts at $995/month and Klarna at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Basis Theory or Klarna?
Basis Theory starts at $995/month and Klarna at On request.
Does Basis Theory or Klarna run on more platforms?
Basis Theory runs on Web, iOS, Android, Linux. Klarna runs on Web, iOS, Android.
What is Basis Theory best used for?
Basis Theory is most often used for a payments company that wants card on file without bringing its own infrastructure into pci scope and paying for the assessment that follows, a merchant locked into a processor by that processor vault that wants to hold its own tokens and route to more than one acquirer, a fintech collecting bank account and identity data that needs it isolated from its application database before an enterprise security review, a team that needs to send stored card data to a third party for a one-off integration without that data traversing its own servers. Of those, a payments company that wants card on file without bringing its own infrastructure into pci scope and paying for the assessment that follows and a merchant locked into a processor by that processor vault that wants to hold its own tokens and route to more than one acquirer are not what Klarna is typically brought in for.
What can Basis Theory do that Klarna cannot?
Basis Theory covers Tokenisation API, Hosted elements, Outbound proxy, PCI attestation of compliance. Klarna covers Pay in 4, Pay in 30 days, Longer-term financing, Klarna app placement.

Answered from the vendors’ own pages

Basis Theory: Does this make us PCI compliant?

It removes cardholder data from your systems and gives you an AOC plus documented responses for most of a SAQ D. Your assessor still determines your scope, and a careless integration can pull systems back in.

Klarna: What does Klarna cost a merchant?

Klarna does not publish a rate card. In the United States most merchants pay around 5.99% plus $0.30 for short-term products, with longer-term financing nearer 3.29% plus $0.30, and large merchants negotiate lower.

Basis Theory: What does it cost to start?

995 US dollars a month on Starter, including 20,000 tokens, a production PCI Level 1 environment and US hosting. Higher tiers are quoted.

Klarna: Does the merchant carry the credit risk?

No. Klarna pays the merchant the full amount less fees and takes the risk of the shopper not paying.

Basis Theory: Can we switch payment processors without re-collecting cards?

Yes, that is the main non-compliance reason to buy it. You hold the tokens and detokenise into whichever processor you route to.

Klarna: Can I use Klarna alongside my existing processor?

Yes. It is normally added as an additional payment method through Shopify, Adyen, Stripe or a direct integration rather than replacing your card acquirer.

Basis Theory: Is data stored outside the United States?

Not on Starter, which is US only. Other regions require a Scale or Enterprise agreement.

Klarna: Is Klarna still independent?

Yes. It listed on the New York Stock Exchange in September 2025 and holds a Swedish banking licence.

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