Stripe AI is a collection of SDKs, tools, an MCP server, and agent skills for building AI products and businesses with Stripe's billing infrastructure. Developers use it to connect Stripe payments and metering to language models and agent frameworks, while the catalogue entries provide Stripe-specific skills, commands, plugins, and agent integrations.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/stripe/aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/stripe/ai/test-cards)<a href="https://agentmods.dev/commands/stripe/ai/test-cards"><img src="https://agentmods.dev/badge/commands/stripe/ai/test-cards/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/commands/stripe/ai/test-cards"><img src="https://agentmods.dev/badge/commands/stripe/ai/test-cards.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00009 | $0.00233 |
| Opus 5.5 | $0.00004 | $0.00093 |
| Sonnet 5.5 | $0.00002 | $0.00047 |
| Haiku 4.5 | $0.00001 | $0.00023 |
Grade A, and why
test-cards scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- test-cards — 100% identical, 0 lines differ
What it actually says
Test Cards Reference
Provide a quick reference for Stripe test card numbers:
- If a scenario argument is provided (e.g., "declined", "3dsecure", "fraud"), show relevant test cards for that scenario
- Otherwise, show the most common test cards organized by category:
- Successful payment (default card)
- 3D Secure authentication required
- Generic decline
- Specific decline reasons (insufficient_funds, lost_card, etc.)
- For each card, display:
- Card number (formatted with spaces)
- Expected behavior
- Expiry/CVC info (any future date and any 3-digit CVC)
- Use clear visual indicators (✓ for success, ⚠️ for auth required, ✗ for decline)
- Mention that these only work in test mode
- Provide link to full testing documentation: https://docs.stripe.com/testing.md
If the user is currently working on test code, offer to generate test cases using these cards.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 25 lines · 9 tokens per session scan A 4e2496258654
test-cards is a command published in the GitHub repository stripe/ai (1,953 stars, last pushed today), licensed MIT. It adds 9 tokens to every session and 233 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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