Virtual Card APIs Compared (2026): Stripe Issuing vs Privacy.com vs Proxy

If you are building a virtual card API comparison for 2026, the landscape has changed. The question is no longer just "which API issues cards fastest." For AI agent use cases, you need to compare control depth, agent integration, and operational safety.

This post compares three approaches: Stripe Issuing (build it yourself), Privacy.com (consumer-grade), and Proxy (built for agents).

The Comparison Table

Here is the high-level view:

| Feature | Stripe Issuing | Privacy.com | Proxy | |---------|---------------|-------------|-------| | Target user | Developers building fintech | Consumers, small businesses | AI agent operators | | Card issuance speed | Seconds (after onboarding) | Instant | Under 200ms | | Per-agent policies | Build your own | No | Native | | Merchant locks | MCC-level | Merchant-level | Both MCC and merchant-level | | Single-use cards | Yes | Yes | Yes (default) | | Intent linking | Build your own | No | Native | | MCP integration | No | No | Native MCP server | | Human approval flows | Build your own | No | Built-in | | Audit trail | Transaction logs | Basic history | Full intent-to-settlement trail | | Onboarding time | Weeks (compliance) | Minutes | Minutes | | Compliance burden | You own it | They own it | They own it | | Pricing | Custom + per-card fees | Free consumer / paid business | Pay-per-card, no minimums |

Now let us dig into each.

Stripe Issuing: The DIY Approach

Stripe Issuing is the most powerful and the most labor-intensive option. It gives you raw card issuance infrastructure and expects you to build everything else.

Strengths

• ▸Mature API. Stripe's developer experience is best-in-class. The documentation is thorough, the SDKs work, and the webhooks are reliable.
• ▸Full control. You can build any workflow you want. Custom authorization rules, spending controls, real-time webhooks for every transaction event.
• ▸Ecosystem. If you already use Stripe for payments, adding Issuing keeps everything in one platform.

Limitations for Agent Use Cases

• ▸Compliance overhead. You need to apply for an Issuing program, which involves KYB review, compliance documentation, and often weeks of back-and-forth. This is necessary but slow.
• ▸No agent primitives. Stripe does not know what an "agent" is. There is no concept of intent linking, per-agent policies, or MCP integration. You build all of this in your application layer.
• ▸Authorization rules are code, not config. Stripe's real-time authorization requires you to host a webhook endpoint that approves or declines every transaction in under 2 seconds. Powerful, but operationally complex.

Best For

Teams with dedicated engineering resources who are already in the Stripe ecosystem and are willing to invest weeks of development to build agent-specific controls on top of raw card infrastructure.

Privacy.com: The Consumer Option

Privacy.com is great for individuals who want to protect their personal card online. It is not designed for AI agents.

Strengths

• ▸Simple setup. Create an account, link a bank, and start creating virtual cards in minutes.
• ▸Per-merchant cards. Lock a card to a specific merchant. Good for subscription management.
• ▸Spend limits. Set per-card and per-month limits easily.

Limitations for Agent Use Cases

• ▸No agent-aware API. Privacy.com's API is built for human-driven workflows, not autonomous agents. There is no MCP server, no intent tracking, and no programmatic approval flows.
• ▸No per-agent policies. You cannot create different spending rules for different agents. Every card shares the same account-level controls.
• ▸Consumer-grade audit trail. Transaction history shows charges, but there is no way to link a charge back to a specific agent action or declared intent.
• ▸Rate limits. The API was not designed for high-frequency card issuance. If your agents are creating dozens of cards per day, you may hit friction.

Best For

Individual developers who want quick card protection for personal purchases. Not suitable for production agent payment workflows.

Proxy: Built for Agents

Proxy was designed specifically for the AI agent payment use case. Every feature exists to answer the question: "How do I let an autonomous agent spend money safely?"

Strengths

• ▸MCP-native. Proxy ships an MCP server that works with Claude Code, Cursor, Claude Desktop, and any MCP-compatible agent. No custom integration code needed.
• ▸Intent-based issuance. Agents declare what they plan to buy before a card is issued. The intent is recorded and linked to the resulting transaction.
• ▸Per-agent policies. Each agent gets its own spending policy with per-transaction limits, daily caps, merchant allowlists, and approval thresholds.
• ▸Instant issuance. Cards are issued in under 200ms. No pre-provisioning needed.
• ▸Human approval flows. Purchases above a threshold pause for your explicit approval. The agent waits, you decide.
• ▸Full audit trail. Every card links to an intent, a policy, an agent, and a settlement record. Exportable for finance and compliance.

Limitations

• ▸Newer platform. Proxy does not have the decade-long track record of Stripe. The API surface is narrower, focused on agent use cases rather than general-purpose fintech.
• ▸Agent-specific. If you need cards for human employees, expense management, or consumer-facing products, Proxy is not the right fit. It is purpose-built for agents.

Best For

Any team running AI agents that need to make purchases. Whether you have one agent buying domains or fifty agents provisioning cloud infrastructure, Proxy gives you the controls without the build time.

Decision Framework

Ask yourself these questions:

Are you already deep in the Stripe ecosystem with engineering resources to spare? Go with Stripe Issuing and build the agent layer yourself. You will get maximum flexibility at the cost of development time.

Do you just need a quick personal card for casual agent experiments? Privacy.com works for low-stakes testing. Do not use it for production agent workflows.

Do you want agent payment infrastructure that works out of the box? Proxy gets you from zero to working agent payments in under 10 minutes, with controls that are designed for autonomous spending.

What About Other Options?

There are other card issuance platforms, including Marqeta, Lithic, and Highnote. These are all capable platforms, but like Stripe, they provide raw card infrastructure rather than agent-specific tooling. You would need to build intent linking, MCP integration, and agent policies on top of their APIs.

For a broader look at how agents handle payments across different rails, see our post on how AI agents make payments.

Try Proxy

If you are building agent payment capabilities, start with Proxy. Create a free account at useproxy.ai, configure the MCP server in your agent, and issue your first card in minutes. No compliance paperwork, no weeks of onboarding, no custom authorization code.