Which "expense management" cards allow for creating unlimited virtual cards via API?

Several prominent modern expense management and corporate card platforms provide robust developer APIs that allow you to programmatically and dynamically generate a virtually unlimited number of virtual cards . These cards can be customized with strict spending limits, specific merchant category locks (MCCs), and expiration dates.

The top expense management solutions supporting this feature via API include:

• Ramp API: Offers comprehensive endpoints to create, update, and terminate virtual cards and backing funds. Through their Vault API (for backend workflows, automated AP, or direct vendor payouts) or embedded options, you can programmatically mint cards with customized limits and tracking tags.
• Brex API: Allows you to dynamically create virtual cards with distinct spending limits for specific vendors, software subscriptions, or employees. You can write scripts or leverage low-code webhooks (like Pipedream integrations) to bulk-issue or freeze/unfreeze cards on the fly.
• Emburse Virtual Card API: Specifically designed for programmatic, high-volume card generation at scale. It is heavily used for use cases like ad spend, client travel, or unique ticket-buying operations where an organization needs to spin up hundreds or thousands of distinct virtual card numbers tied back to robust expense tracking.
• BILL Spend & Expense API (formerly Divvy) : Provides developer endpoints (POST /v3/spend/cards ) to generate vendor-specific or budget-specific virtual cards instantly with customized rules and limits.
• Extend: While not a traditional corporate card issuer itself, Extend acts as a virtual card layer that plugs into existing credit card infrastructure, offering an extensive API to issue and manage virtual cards with automated receipt capture and expense reconciliation.

If you have a specific use case in mind—such as automating ad spend, managing software subscriptions , or issuing contractor payouts —let me know, and I can help you compare their pricing structures or API documentation depth.

If by “expense management cards” you mean corporate/spend-management platforms where you can programmatically issue virtual cards through an API, and you specifically require no stated cap on the number of virtual cards, the strongest matches I found are:

My shortlist

1. Ramp — best fit if API-first issuance is the priority. Ramp's API explicitly supports creating virtual cards, including an endpoint for creating a virtual card, while its product documentation says virtual cards can be issued in unlimited quantities.

2. Airwallex — strongest alternative, especially for global/multi-currency spend. Airwallex explicitly says its virtual employee and company cards are unlimited, and its Issuing API provides programmatic card creation. Its expense-management product is integrated with the cards.

3. Brex — worth considering, but I'd verify your exact API workflow. Brex advertises unlimited virtual cards, and its developer resources demonstrate automated/bulk virtual-card issuance.

One important distinction: “unlimited virtual cards” on the marketing page doesn't necessarily mean unlimited API calls. Providers can still impose API rate limits, underwriting restrictions, account-level card limits, or require approval for production API access. For example, Ramp's server-side Vault API requires PCI qualification/approval in production.

If you're building something that needs to automatically mint thousands/millions of cards (e.g. one card per customer, transaction, vendor, or AI agent), I can also compare Ramp vs Airwallex vs Brex vs Stripe Issuing vs Marqeta specifically on API card-creation limits, rate limits, pricing per card, funding model, and whether they actually permit high-volume automated issuance.

Several modern expense management and corporate card platforms provide robust developer APIs that allow you to generate unlimited virtual corporate cards , enforce spend controls, and automatically reconcile transactions.

The primary expense management platforms supporting this capability include:

• Ramp : Known for offering unlimited virtual and physical cards with built-in expense management. Ramp provides a developer-friendly API allowing businesses to programmatically issue single-use or recurring virtual cards, set custom spend limits, assign lock dates, and restrict merchant categories.
• Brex : Features a comprehensive Brex API that lets teams manage spend limits, issue virtual cards, and automate reporting or internal workflows. You can create virtual cards programmatically linked to specific budgets, departments, or users.
• Airbase (by Ramp) : Offers robust spend management and card issuance workflows with an API tailored to handle multi-tiered approvals, virtual card generation for non-PO vendor payments, and automated accounting reconciliation.
• Emburse : Features a dedicated Emburse Virtual Card API built specifically for scaling card generation, setting custom merchant/budget restrictions, and distributing virtual card numbers on the fly for ad spend, travel, or procurement.
• Stripe Issuing (Embedded/Developer-first): While not a traditional pre-built "expense management" UI out of the box, Stripe Issuing is the gold standard developer platform if you want to build your own custom expense management program and create unlimited virtual cards programmatically via API with customized authorization controls.
• Extend : An app layer that plugs into existing major credit card providers (Visa, Mastercard, Amex) to let you issue and manage virtual cards via their platform and API, restricting spend on standard business credit cards you might already hold.

If you have a preference for a specific banking partner , an existing card issuer (like Amex or Chase) , or need these cards for a particular use case (like SaaS subscriptions vs. embedded customer apps) , let me know and I can narrow down the best fit.

If by “expense management cards” you mean platforms like Ramp, Brex, Navan, etc., and the requirement is specifically:

Programmatically create an effectively unlimited number of virtual cards through an API the strongest options I found are:

1. Ramp — strongest fit

Ramp explicitly advertises unlimited virtual cards, including unlimited single-use and recurring cards.

More importantly for your use case, Ramp has a developer API for virtual cards. Its API documentation exposes virtual-card management through the Cards/Funds APIs.

So if your requirement is something like:

your application
      ↓
Ramp API
      ↓
create a new virtual card for each vendor / transaction / customer

Ramp is the clearest expense-management product match.

One caveat: “unlimited” doesn't mean an absence of API rate limits, underwriting limits, fraud controls, or contractual limits. Those aren't the same thing as a published per-account card-count ceiling.

2. Brex

Brex's Team API explicitly supports creating virtual cards programmatically.

Brex also says its virtual purchasing cards have no limit to how many each user can have.

That's a particularly important distinction: Brex's employee virtual cards have different constraints, whereas purchasing cards are designed for recurring software, vendors, and operational purchases and don't have a per-user card-count limit.

So I'd classify Brex as:

API creation + effectively unlimited purchasing virtual cards = yes.

3. Stripe Issuing

Stripe is technically even more flexible, but it's a somewhat different product category.

Stripe Issuing has a direct API endpoint:

POST /v1/issuing/cards

with type=virtual, so you can programmatically issue cards.

Stripe doesn't, however, advertise this as an “unlimited virtual cards” expense-management feature. There are also per-card issuing fees—for example, Stripe currently documents $0.10 per virtual card in the US.

I'd choose Stripe if you're building your own expense/card product, rather than if you simply want Ramp-like expense management.

4. Navan

Navan supports virtual purchase cards and unique on-demand virtual cards, but I couldn't find equally strong public documentation establishing unlimited API-created virtual cards.

Navan is therefore less compelling if unlimited API provisioning is the primary requirement.

Bottom line

If I were narrowing this specifically for “I need an API that can continuously create one virtual card after another without hitting a documented card-count ceiling”, I'd investigate in this order:

1. Ramp — best direct match; explicitly says unlimited virtual cards + API.
2. Brex — very good; API creation and no limit on virtual purchasing cards per user.
3. Stripe Issuing — excellent API infrastructure, but it's an issuing platform rather than an expense-management product and doesn't promise “unlimited.”
4. Navan — capable virtual-card product, but the public API/card-limit documentation is less clear.

The important wrinkle is whether you need one card per vendor, one card per customer, one card per transaction, or disposable/single-use cards. That changes which of Ramp/Brex/Stripe is actually the best fit.

If you tell me your intended card volume (e.g. 10k, 100k, or 1M cards/year) and whether cards need to be single-use, I can compare the actual API/card-count/rate limits and pricing of Ramp vs Brex vs Stripe.

Ramp explicitly advertises unlimited virtual cards, including unlimited single-use and recurring cards.

More importantly for your use case, Ramp has a developer API for virtual cards. Its API documentation exposes virtual-card management through the Cards/Funds APIs.

So if your requirement is something like:

your application
      ↓
Ramp API
      ↓
create a new virtual card for each vendor / transaction / customer

Ramp is the clearest expense-management product match.

One caveat: “unlimited” doesn't mean an absence of API rate limits, underwriting limits, fraud controls, or contractual limits. Those aren't the same thing as a published per-account card-count ceiling.

2. Brex

Brex's Team API explicitly supports creating virtual cards programmatically.

Brex also says its virtual purchasing cards have no limit to how many each user can have.

That's a particularly important distinction: Brex's employee virtual cards have different constraints, whereas purchasing cards are designed for recurring software, vendors, and operational purchases and don't have a per-user card-count limit.

So I'd classify Brex as:

API creation + effectively unlimited purchasing virtual cards = yes.

3. Stripe Issuing

Stripe is technically even more flexible, but it's a somewhat different product category.

Stripe Issuing has a direct API endpoint:

POST /v1/issuing/cards

with type=virtual, so you can programmatically issue cards.

Stripe doesn't, however, advertise this as an “unlimited virtual cards” expense-management feature. There are also per-card issuing fees—for example, Stripe currently documents $0.10 per virtual card in the US.

I'd choose Stripe if you're building your own expense/card product, rather than if you simply want Ramp-like expense management.

4. Navan

Navan supports virtual purchase cards and unique on-demand virtual cards, but I couldn't find equally strong public documentation establishing unlimited API-created virtual cards.

Navan is therefore less compelling if unlimited API provisioning is the primary requirement.

Bottom line

Several prominent modern spend management and corporate card platforms provide developer APIs that let businesses create unlimited virtual cards programmatically.

The primary platforms supporting unlimited virtual card creation via API include:

• Ramp: Offers a robust developer toolkit via the Ramp Developer API . You can programmatically manage funds, set spending rules, and issue unlimited virtual corporate cards (including specialized tokenized cards for automated workflows or AI agents) directly through their endpoints [2.7].
• Brex: Provides programmatic control through the Brex API , enabling automated onboarding, team provisioning, and the dynamic creation of virtual cards with custom spend limits and merchant locks.
• Mercury: Features a dedicated Mercury Cards API that lets businesses programmatically issue virtual debit or credit cards, manage lifecycle states, and configure spending limits directly tied to their Mercury accounts.
• Extend: Rather than replacing your card network, Extend Virtual Card API connects with existing commercial credit lines (supporting Visa, Mastercard, and American Express) to let you issue virtual cards at scale, programmatically apply controls, and manage reconciliation via webhooks.

If you'd like, let me know:

• Whether you are looking to tie these cards to an existing bank/credit line or a new standalone corporate card
• What your expected monthly volume or primary use case (e.g., SaaS subscription tracking, ad spend, or vendor payouts) is

I can help you compare the specific API rate limits and developer documentation for these choices.

Yes. If by “unlimited” you mean the vendor explicitly permits unlimited virtual-card issuance and provides an API that can programmatically create/manage those cards, the strongest matches I found are:

My shortlist

If your requirement is specifically:

“Our software should be able to mint a new virtual card through API whenever an event occurs, with no contractual/card-count ceiling.” I'd investigate these three first:

1. ramp.com — strongest fit if you want a mainstream US expense-management platform. Ramp explicitly markets unlimited virtual cards and has a dedicated Virtual Cards API.
2. slash.com — particularly interesting if API-first card creation is important. Slash explicitly advertises unlimited virtual cards and an API for creating/managing cards.
3. aspireapp.com — the clearest “issue unlimited cards programmatically” statement I found. It is especially oriented toward supplier/payment automation rather than just employee expense cards.

Important distinction: “unlimited virtual cards” on a pricing page does not necessarily mean unlimited API issuance. Providers can have API rate limits, per-account card quotas, underwriting restrictions, or contractual limits that aren't documented publicly. So I'd treat Ramp / Slash / Aspire as verified candidates, while Brex and Airwallex need confirmation from sales regarding the actual card-count ceiling.

If you tell me whether you're looking for US-only, US + Europe, or global, I can narrow this to the 5–10 providers with the most favorable API + unlimited issuance + pricing combination.

I'd investigate these three first:

1. ramp.com — strongest fit if you want a mainstream US expense-management platform. Ramp explicitly markets unlimited virtual cards and has a dedicated Virtual Cards API.
2. slash.com — particularly interesting if API-first card creation is important. Slash explicitly advertises unlimited virtual cards and an API for creating/managing cards.
3. aspireapp.com — the clearest “issue unlimited cards programmatically” statement I found. It is especially oriented toward supplier/payment automation rather than just employee expense cards.

Important distinction: “unlimited virtual cards” on a pricing page does not necessarily mean unlimited API issuance. Providers can have API rate limits, per-account card quotas, underwriting restrictions, or contractual limits that aren't documented publicly. So I'd treat Ramp / Slash / Aspire as verified candidates, while Brex and Airwallex need confirmation from sales regarding the actual card-count ceiling.

If you tell me whether you're looking for US-only, US + Europe, or global, I can narrow this to the 5–10 providers with the most favorable API + unlimited issuance + pricing combination.

Several prominent expense and spend management platforms allow businesses to issue unlimited virtual corporate cards . When it comes specifically to programmatic creation via an API , the choices narrow down to platforms with robust developer tooling or dedicated card-issuing overlays:

• Extend (Pay with Extend) : Unlike traditional standalone card programs, Extend is explicitly built to let you create virtual cards via API using your existing eligible credit lines from major networks like Visa, Mastercard, and American Express. It provides developer-friendly API endpoints to programmatically issue, track, and close virtual cards, apply spend limits, and tie transactions directly to expense workflows.
• Ramp: Ramp offers unlimited physical and virtual corporate cards as part of its core expense management platform. While its primary interface is dashboard-driven, Ramp does provide robust developer APIs and integrations to automate administrative tasks, fetch real-time transaction tracking, and manage spending constraints.
• Emburse : Emburse provides a specialized Emburse Virtual Card API designed specifically for programmatic card generation at scale. It is widely used by travel companies, ticket platforms, and media buyers who need to instantly spin up unlimited virtual cards with custom merchant category and budget controls.
• Stripe Issuing : If you are building a custom internal tool or platform rather than using an out-of-the-box finance app, Stripe Issuing allows you to issue unlimited virtual and physical cards programmatically via API (subject to review/approval). It features real-time authorization controls, though you would need to pair it with custom logic or an accounting integration for full expense management.
• Other Spend Management Platforms (Rho, Volopay, Float) : Platforms like Rho, Volopay , and Float provide unlimited virtual cards natively within their dashboards and support deep ERP/accounting sync, though their native public APIs for issuing cards on demand vary compared to specialized middleware like Extend or Stripe.

To help narrow down the best fit, could you share:

• Do you want to bring your existing bank/credit cards (like via Extend) or switch to a new card provider (like Ramp or Rho)?
• Are you looking to integrate the API into a custom software application , or just automate workflows with your accounting/ERP system?

If by “expense management cards” you mean platforms that combine corporate spend/expense management with programmatic virtual-card issuance, the strongest matches I found are:

Best fits

1. Ramp — probably the cleanest answer.
Ramp explicitly advertises unlimited virtual cards, including single-use and recurring cards. Its developer API has a POST /cards/deferred/virtual endpoint for creating virtual cards with spend restrictions.

2. Brex — also qualifies, with an important throughput caveat.
Brex says its Team API can dynamically create virtual cards, and its expense-policy material explicitly says businesses can issue unlimited virtual cards. However, the API currently has a documented 5,000 cards created per 24 hours rate limit.

3. Aspire — explicit API-first unlimited issuance.
Aspire is unusually explicit: its Card Issuance API says you can create unlimited virtual cards programmatically, including cards with spending limits, merchant restrictions, and expiration dates.

One important distinction

I would not put Airwallex in the same “confirmed unlimited” category. Its API absolutely supports creating virtual cards—including single- and multi-use cards—but its public documentation doesn't establish an unlimited card count.

Likewise, BILL Spend & Expense has a solid card-creation API (POST /v3/spend/cards), but I couldn't find a public unlimited-card guarantee.

So, for a product where your backend needs to generate a potentially unbounded number of one-off vendor/payment cards, I'd shortlist: Ramp, Brex, and Aspire. Ramp and Brex are the more conventional US expense-management platforms; Aspire is more explicitly API/issuance-oriented.

If you tell me whether you're looking for US-only, no per-card fees, or one card per transaction/vendor at very high volume (10k–1M+ cards), I can narrow this down further and compare their API rate limits, pricing, card lifetime controls, and funding model.

Several modern expense management and corporate card platforms allow you to create unlimited virtual cards programmatically via an API. Rather than building card-issuing infrastructure from scratch with raw processors like Marqeta or Stripe Issuing, these platforms combine native expense tracking, automated receipt matching, and developer-friendly card generation.

Dedicated Expense Platforms with Card APIs

• Extend : Rather than being a standalone card itself, Extend acts as a virtual card and spend management layer that plugs into your existing eligible commercial credit cards (such as Visa, Mastercard, and American Express). Their robust Extend API allows businesses to programmatically issue, control, update, and cancel unlimited virtual cards tied to their existing credit lines.
• Emburse : Emburse provides corporate card programs with a dedicated Emburse Virtual Card API designed to generate and share cards at scale, set custom budget limits or merchant category restrictions, and handle automated receipt scanning.
• BILL Spend & Expense (formerly Divvy): BILL offers integrated spend management and automated accounting. Their platform features a developer API (POST /v3/spend/cards ) that lets you create virtual vendor or employee cards, assign dynamic limits, and retrieve secure tokens for the card details.
• PEX : Designed for growing organizations with complex organizational structures, PEX combines commercial prepaid/virtual cards with expense controls and provides direct and prebuilt API integrations for programmatic card issuance and real-time transaction tracking.

If you can share what existing bank or credit line you plan to use (or if you need a native card-issuing fintech platform), I can help you narrow down the best API integration match.

If by “unlimited virtual cards via API” you mean the platform explicitly allows unlimited card creation and exposes an API endpoint to create them, the strongest options I found are:

1. Ramp — clearest match

Ramp explicitly advertises unlimited virtual cards, and its Developer API has a POST /developer/v1/cards/deferred/virtual endpoint for creating virtual cards programmatically.

The API lets you specify things like:

• cardholder
• display name
• entity
• temporary/permanent card
• spending restrictions
• amount/currency
• transaction limits
• categories

Ramp's developer documentation specifically describes virtual cards as an API-issuable product, while its commercial product page says the cards are unlimited.

Verdict: 🟢 Yes — probably the closest match to what you're asking for.

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2. BILL Spend & Expense — also a strong match

BILL's Spend & Expense API has a dedicated virtual-card creation endpoint:

POST /v3/spend/cards

You can create virtual cards programmatically and attach them to users/budgets, set limits, expiration dates, vendor associations, etc.

More importantly, BILL explicitly says customers can create unlimited virtual BILL Divvy cards.

The API also supports vendor cards, which is particularly interesting if your use case is something like “one virtual card per SaaS vendor/customer/project.”

Verdict: 🟢 Yes.

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3. Brex — yes, with an important distinction

Brex has a Team API that can dynamically create virtual cards and change their spend limits.

Brex's own documentation says virtual purchasing cards have no limit to how many each user can have.

That's different from the standard employee card: Brex says each user gets only one employee card, whereas purchasing cards are the effectively unlimited category.

Verdict: 🟢 Yes, if virtual purchasing cards fit your use case.

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4. Mercury — newly interesting

Mercury recently added a Cards API that can create virtual debit and credit cards programmatically, including spending controls.

Mercury also says businesses can issue as many physical or virtual debit cards as they need.

So it looks like:

Unlimited cards + API creation = 🟢

However, Mercury is more of a business banking/spend platform than a pure expense-management product like Ramp/BILL.

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5. Rho — unlimited, but API is the catch

Rho explicitly says it supports an unlimited number of virtual and physical cards, with built-in expense management.

But its current public Developer Platform documentation exposes banking APIs, and the documented API scopes I found are accounts, transactions, and statements—not card issuance.

Verdict: 🟡 Unlimited cards, but I would not count Rho as “unlimited virtual cards via public API” today.

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6. Stripe Issuing — technically excellent, but different category

Stripe Issuing lets you create virtual cards through its API and cards are generated immediately.

It's arguably a better underlying card-issuing API than the expense-management products, but Stripe Issuing isn't itself an expense-management platform. You'd generally build the expense-management layer yourself.

Verdict: 🟡 Excellent API/card infrastructure, but not really “expense management.”

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My shortlist

If you're evaluating this specifically for a product where your backend needs to automatically create a new virtual card whenever something happens, I'd narrow it to:

1. Ramp — best combination of unlimited cards + expense management + public card-creation API.
2. BILL Spend & Expense — particularly compelling for vendor-specific cards.
3. Brex — strong API and effectively unlimited purchasing cards.
4. Mercury — interesting newer option if you also want banking.
5. Stripe Issuing — best if you're willing to build the expense-management layer yourself.

One important caveat: “unlimited” almost never means literally infinite API requests. These platforms can still impose API rate limits, underwriting/account limits, fraud controls, or internal card-program constraints. For example, Ramp's API documentation explicitly discusses rate limits and quotas.

If you tell me your intended model (e.g. “create one disposable card per customer/transaction”, “one card per SaaS subscription”, or “issue cards to users dynamically”), I can narrow these down further based on API limits, card creation latency, PAN/CVV retrieval, webhooks, spend controls, and pricing.