LiteLLM + SaaS APIs
LiteLLM alternative for Stripe? Not what you want.
LiteLLM is an LLM proxy. Stripe is not an LLM. If you're searching for "LiteLLM alternative for Stripe" you're looking for a complement, not a replacement — something that does for your SaaS-tool API keys what LiteLLM does for OpenAI and Anthropic keys.
TL;DR
LiteLLM caps LLM spend. It does not route Stripe, Twilio, or Resend calls. You need a second proxy — the equivalent shape, different vendor list. That proxy is what Keybrake builds. LiteLLM stays for your LLM keys, Keybrake sits in front of your payment and messaging keys. Two tools, no overlap.
Why this query is confusing
LiteLLM's core idea — an OpenAI-compatible proxy that caps spend per virtual key, logs every call, and lets you revoke mid-run — is exactly the idea you want for a Stripe key. So people search for "LiteLLM alternative for Stripe" hoping to find a fork or a config flag. There isn't one. LiteLLM's dispatcher speaks OpenAI's request/response shape and knows how to price LLM tokens. Stripe doesn't have tokens; it has payments with dollar amounts in response headers, and those amounts live in different fields than LLM costs.
The right framing: the LiteLLM shape, different data plane. Same architecture, different parsers, different policy primitives.
Side-by-side: LiteLLM vs. a Stripe-specific proxy
| Capability | LiteLLM | What you want for Stripe |
|---|---|---|
| Upstream vendors | OpenAI, Anthropic, Gemini, 100+ LLM providers | Stripe, Twilio, Resend, Shopify, Postmark |
| Virtual keys per agent | Yes (sk-…) | Yes (Keybrake: vault_key_…) |
| Spend cap unit | Tokens × model price | Dollars parsed from vendor response (Stripe: amount; Twilio: price; Resend: fixed per send) |
| Endpoint allowlist | Model allowlist per key | HTTP method + path allowlist (POST /v1/refunds yes; POST /v1/payouts no) |
| Customer / record scope | N/A — LLM calls are stateless | Customer / merchant allowlist (Stripe customer, on_behalf_of) |
| Mid-run revocation | Yes — flip the virtual key | Yes — flip the vault key |
| Audit log | Request + response + tokens | Request + response + parsed cost + policy decision |
Row 1 is the only row that actually differs. Everything else is the same architectural idea, applied to a different data plane.
Why you can't just point LiteLLM at Stripe
Three technical reasons LiteLLM cannot be a Stripe proxy even if you wanted it to:
- Request shape. LiteLLM's handlers expect
POST /v1/chat/completions-shaped bodies withmessages[],model, etc. Stripe'sPOST /v1/refundsis form-encoded withcharge,amount,reason. No adapter. - Cost parsing. LiteLLM prices by token counts × the model's price per 1k tokens. Stripe charges move dollars directly, returned in the
amountfield of the response. Different code path, different policy semantics. - Scope primitives. LiteLLM has no notion of
customeroron_behalf_of. For an agent that should only refund customers assigned to it, LLM-style model allowlists don't map.
The right stack in 2026
For a team running autonomous agents against a real workload, the typical proxy stack has two layers:
agent
│
├─► LiteLLM (or Bifrost, VaultProof, Portkey)
│ └─► OpenAI, Anthropic, Gemini, open-source models
│
└─► Keybrake
└─► Stripe, Twilio, Resend, Shopify, PostmarkThe agent gets a LiteLLM virtual key for LLM calls and a Keybrake vault key for SaaS-tool calls. Each proxy enforces its own spend cap, audit log, and kill-switch. Neither proxy has any overlap with the other — the vendor split is clean and the architecture stays legible.
When a single proxy would be tempting — and why we haven't built one
A plausible design would be one proxy for all outbound calls. We looked at it and concluded the seam is a feature, not a bug. LLM traffic has a qualitatively different cost model (tokens, caching, streaming, prompt-level rate limits) from payment traffic (dollars, webhooks, idempotency keys). Policies for each surface read differently and get tuned by different people. One codebase that tries to be both ends up worse at both.
LiteLLM should do LiteLLM's job. Keybrake should do Keybrake's job. The agent holds two keys. That's the design.
How Keybrake helps
Keybrake is the non-LLM side of the stack above. You keep one Stripe Restricted Key (and Twilio, Resend, etc.) as our upstream; your agents get vault keys with per-day USD caps, customer allowlists, path-level endpoint allowlists, and a mid-run kill-switch. Same idea as LiteLLM's virtual keys, different vendors, different primitives. See the feature matrix →
Related questions
Can I run LiteLLM and Keybrake on the same box?
Yes. They're independent processes. Most teams run LiteLLM already and add Keybrake as a second service; the agent config gets one extra base URL. No shared state, no coordination required.
Does Keybrake also proxy OpenAI?
No. Intentionally. LiteLLM, Bifrost, VaultProof, Portkey already solve that well. Doubling them would add little and subtract clarity from what Keybrake is for.
Is there a single-vendor LiteLLM for Stripe?
Not that we've seen in production. The closest thing is Stripe's own Agent Toolkit and its MCP server, which help with invocation but do not add caps, allowlists, or audit outside what Restricted Keys already give you. Keybrake is built to fill that gap.
What if my agent calls a vendor Keybrake doesn't support yet?
Today the supported v1 vendors are Stripe, Twilio, and Resend — picked because their responses expose a parseable cost. Roadmap vendors are listed on the homepage. If your vendor isn't there, tell us on the waitlist form — we're prioritising by real demand signals, not guesses.
Further reading
- How to give an AI agent a Stripe API key — the five controls every team needs before handing over a live key.
- Stripe Restricted Key permissions — what each scope enables and the runaway risk per resource.
- A working Restricted Key example — the minimum scope set for a refund-issuing support agent.