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APIs · head to head

Marqeta vs Stainless

Marqeta logo

Marqeta

APIs

Card issuing and transaction processing APIs with just-in-time funding

From
On request
Rated
-
Full reviewWebsite
Stainless logo

Stainless

APIs

Generates client SDKs, API docs, and MCP servers from an OpenAPI spec

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Stainless has a free tier, so it costs nothing to try first.
  • Each has a real cost: Marqeta you still need a sponsor bank and a BIN, so the timeline and compliance burden of launching are set by a bank you must separately court and satisfy.; Stainless starter and Pro plan prices are not published and require contacting the company.
  • They diverge on capability: Marqeta covers Just-in-time funding, Stainless covers SDK generation.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Marqeta and Stainless actually diverge.

Attributes where Marqeta and Stainless differ
AttributeMarqetaStainless
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWeb, REST APIweb, api

Identical on both: user rating (Not yet rated), category (APIs).

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 Marqeta

  • Just-in-time funding
  • Virtual and physical issuing
  • Spend controls
  • Programme management tools
  • Multi-region issuing
  • Webhooks and ledger data

Only in Stainless

  • SDK generation
  • MCP server generation
  • Docs site generation
  • Webhooks and streaming support
  • Automated unit tests
  • Git integration

What people use each for

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

Marqeta

  • A delivery marketplace funding courier cards only at the moment a courier pays for the ordernot Stainless
  • An expense platform issuing a virtual card per subscription with merchant locksnot Stainless
  • A lender issuing a card that draws on an approved credit line rather than a stored balancenot Stainless
  • A fintech wanting the same issuing stack across US and European programmesnot Stainless

Stainless

  • Generating typed SDKs for a public APInot Marqeta
  • Producing an MCP server from an existing OpenAPI specnot Marqeta
  • Building an API documentation site alongside client librariesnot Marqeta
  • Giving open-source APIs a free SDK generation pathnot Marqeta

Where each one falls short

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

Marqeta

  • You still need a sponsor bank and a BIN, so the timeline and compliance burden of launching are set by a bank you must separately court and satisfy.
  • Pricing carries minimum monthly platform commitments, so a programme with modest card volume pays for capacity it never uses.
  • Programme revenue depends heavily on interchange, which means regulated debit interchange caps and European interchange caps materially change the business case by market.
  • Disputes, chargebacks and fraud losses sit with the programme, and teams that assumed the processor absorbed them discover a real operations headcount requirement.
  • Just-in-time funding makes your own authorisation endpoint a hard availability dependency; if it is slow or down, cards decline at the point of sale.

Stainless

  • Starter and Pro plan prices are not published and require contacting the company.
  • The free plan caps APIs at 25 endpoints, which excludes larger production APIs.
  • Overage charges apply per SDK/endpoint/month once limits are exceeded, which can make costs unpredictable at scale.

Pricing, plan by plan

Marqeta

On request
  • Marqeta card issuing$undefined/year
    • Minimum monthly platform fee plus per-transaction and per-active-card charges
    • Interchange share negotiated between programme, processor and sponsor bank
    • Sponsor bank required, with its own fees and approval process

Stainless

Free
  • FreeFree
    • Up to 5 generators (SDKs, docs, or MCP servers)
    • 5 seats
    • APIs with 25 or fewer endpoints
  • Starter$undefined/mo
    • Unlimited generators
    • Expanded seats
    • Private SDKs of any size
  • Pro$undefined/mo
    • Custom enterprise features and pricing
  • Enterprise$undefined/mo
    • Dedicated support
    • SOC 2 compliance reports
    • Purchase order/invoicing with negotiable terms

Which should you pick?

Choose Marqeta if

  • You need just-in-time funding.
  • You work on Web, REST API.
  • You also want virtual and physical issuing.
Marqeta review

Choose Stainless if

  • You need sdk generation.
  • You want to start without paying.
  • You work on web, api.
  • You also want mcp server generation.
Stainless review

Questions people ask

Is Marqeta or Stainless better?
Neither clearly leads. Marqeta starts at On request and Stainless at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Marqeta or Stainless?
Stainless has a free tier; the other does not. Paid plans start at On request for Marqeta and Free for Stainless.
Does Marqeta or Stainless run on more platforms?
Marqeta runs on Web, REST API. Stainless runs on web, api.
Can I use Stainless for free?
Yes. Stainless has a free tier, so you can try it without paying. Marqeta starts at On request.
What is Marqeta best used for?
Marqeta is most often used for a delivery marketplace funding courier cards only at the moment a courier pays for the order, an expense platform issuing a virtual card per subscription with merchant locks, a lender issuing a card that draws on an approved credit line rather than a stored balance, a fintech wanting the same issuing stack across us and european programmes. Of those, a delivery marketplace funding courier cards only at the moment a courier pays for the order and an expense platform issuing a virtual card per subscription with merchant locks are not what Stainless is typically brought in for.
What can Marqeta do that Stainless cannot?
Marqeta covers Just-in-time funding, Virtual and physical issuing, Spend controls, Programme management tools. Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support.

Answered from the vendors’ own pages

Marqeta: Do I need a sponsor bank?

Yes. Marqeta is an issuer processor, not a bank. Card programmes run on a sponsor bank BIN, and that bank approves and supervises your programme.

Stainless: Is there a free plan, and what are its limits?

Yes. The Free plan supports up to 5 generators, 5 seats, APIs with 25 or fewer endpoints, and 100 preview builds per month, with email support.

Source
Marqeta: How does the pricing really work?

A minimum monthly platform fee plus per-transaction and per-active-card charges, offset by a negotiated share of interchange. The interchange split is the substance of the deal.

Stainless: Who owns the generated SDK code?

The generated SDK code is owned by the customer and published by Stainless under the Apache 2.0 license.

Source
Marqeta: What is just-in-time funding?

Marqeta calls your endpoint at authorisation so you decide and fund each transaction, rather than pre-loading balances onto cards.

Stainless: What happens if I exceed my plan's endpoint limit?

Customers exceeding their endpoint limits are billed per SDK, per endpoint, per month for the overage.

Source
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