Your AI costs
are too high.
BTL Runtime sits between your app and AI providers like OpenAI and Anthropic. It automatically routes to the cheapest option, caches repeated requests, and shows you exactly how much you saved — on every single call. Change one URL. No other code changes.
Routes across every major AI provider — with no code changes
See what you'll save
before you switch.
Test it on a real request first. See the cost breakdown. Then move your traffic knowing exactly what you'll pay and what you'll keep.
Send a real request to our preview endpoint and get back the cheapest route, what the direct cost would be, what we'd charge, and how much you'd save — before moving anything live.
Change the URL your app sends AI requests to. Same SDK, same model names, same response format. Your app doesn't know anything changed — it just gets cheaper.
Every response includes what the direct cost would have been, what you were charged, and how much was saved. The dashboard keeps a running total over time.
Start with the requests
you send over and over.
The biggest savings come from repeated requests — support bots, document Q&A, agents re-reading the same context. That's where the numbers get obvious fast.
| Line item | Benchmark direct | Via BTL Runtime |
|---|---|---|
| First request | $0.014 | $0.014 |
| Repeat request (cache hit) | $0.014 | $0.0056 |
| Saved on repeat request | $0.00 | $0.0084 |
| 100,000 similar repeats / month | $1,400 | $560 |
| Annualized effective cost | $16,800 | $6,720 |
What you can verify before you commit.
See the cost breakdown before and after you switch — not buried in a blended monthly invoice three weeks later.
Estimate your savings.
Then test with a real request.
Use this to get a rough number, then send one of your real requests to our preview endpoint to get the exact cost before moving anything live.
Model the repeated traffic first.
Use repeated or cache-friendly routes for the first estimate. Then run a real request through /v1/account/quote to see route and pricing details on your actual payload.
Why teams choose BTL
over the alternatives.
Different tools solve different problems. Runtime is for teams that want to see the exact cost and savings on every request — not just a lower bill in theory at the end of the month.
LiteLLM is a good fit when you want to self-host the routing layer. Runtime is for teams that want cost previews, per-request savings proof, and a dashboard already built — without running another piece of infrastructure.
OpenRouter is a good fit when access to many models is the main goal. Runtime is for teams that want to see exactly what each request costs, what they charged customers, and how much was saved — on every call.
Building it yourself makes sense if you want to own every provider integration and billing edge case. Runtime is for teams that want the savings to be part of the product on day one, not a six-month infrastructure project.
Who this is for.
And why it works.
Runtime is a live product from the team behind RetainDB. The goal is to give AI teams a cost layer that is actually visible and verifiable, not just promised in a sales deck.
Everything shown here — workspace, API keys, cost previews, savings tracking, provider connections, and request logs — is already built and live. Not on the roadmap.
We charge 4% on top of provider costs, dropping to 2% at scale. Caching reduces the amount we charge on. We only make more money if you actually spend more — so the incentive is to make requests as cheap as possible.
Start free.
Scale when it makes sense.
You see every provider cost — we add a small fee on top that shrinks as you grow. Or connect your own API keys and keep the savings layer without paying us per-token.
$5 free on signup. No card required. You see every provider cost.
- $0–$500: 4% fee on top of provider costs
- $500–$5,000: 3% fee
- $5,000+: 2% fee
- Caching and cost savings included
- No card required to start
Connect your existing OpenAI, Anthropic, or Google keys and keep the savings layer.
- Works with OpenAI and Anthropic key formats
- Your provider bill stays with you
- Routing and caching still apply
- Cost tracking and savings dashboard stay on
- No code changes beyond the URL
Dedicated instance, SLA-backed. SSO, audit logs, priority support.
- Everything in Hosted
- Negotiated fee tier
- SLA and uptime guarantee
- SSO / SAML
- Dedicated onboarding
Start saving on
your first request.
Create a workspace, test one real request to see the cost breakdown, and move your first traffic in minutes.