Continuous optimization
Between your orchestrator and your models. Running locally in London.
PII redaction
Stripped before audio reaches your models or logs.
TTS smart caching
Repeated TTS responses served from cache. Provider never gets called.
LLM routing
Simple turns stay local. Complex turns hit your LLM. Fewer model calls per conversation.
Transcripts
Region, provider, model, cost, latency. Logged per step, per call.
Analytics
Cost and latency tracked against baseline. Dashboard shows the delta.
One header
Add X-Region to any API call. No change to your orchestrator, your models, your agent logic.
1curl -X POST https://api.slng.ai/v1/llm \
2 -H "Authorization: Bearer $SLNG_API_KEY" \
3 -H "X-Region: eu-west-2" \
4 -d '{
5 "model": "gpt-4o",
6 "messages": [{"role": "user", "content": "..."}]
7 }'Available models in the UK
US$ 0.0033 / agent minute
Deepgram Nova 3
Optimized for live applications, delivering low-latency transcription that enables responsive voice agents, captions, and interactive systems.
Soniox STT AI
A universal speech AI that lets you transcribe and translate speech in 60+ languages — from recorded files (async) or live audio streams (real-time).
Rime Arcana 3
Provides industry leading latency, enabling natural back-and-forth interactions without awkward pauses.
Cartesia Sonic 3
Takes text input and streams back ultra-realistic speech in response. Can also clone voices, with full control over pronunciation and accent.
Murf AI Falcon
Optimized for real-time use cases where responsiveness is critical. Ensures conversations feel seamless, natural, and instant.
Soniox TTS RT
Engineered to handle the edge cases that break most production speech systems. Delivers high-fidelity speech across 60+ languages with hallucination-free guarantee.
Deepgram Aura 2
Real-time text-to-speech model built for conversational AI. It generates natural, human-like speech with low latency. Low latency, multiple voice options. Streaming.
Compliance and security
Execution layer in London
Keep your pipeline. Add the execution layer
Continuous cost and latency reduction.
Keep your orchestrator
Livekit, Pipecat, custom. Your application code stays the same.
Keep your LLM
Keep your existing model and provider. SLNG routes, caches, and reduces cost on every call.
Keep your STT & TTS models
Bring your existing contract and provider. Or choose from SLNG 30+ model catalogue.
Getting started
Live instantly. Results within 24hrs
Send your existing call flow. We run it locally in the UK and show you the numbers against your current setup.
1. Add your keys
Bring your own keys for STT, LLM, and TTS. We never see your credentials.
2. Point to SLNG //
Direct your orchestrator to SLNG endpoints for STT, LLM, and TTS.
3. See the results
Give it 24 hours. Your dashboard shows savings, latency, and quality vs. baseline.
How much does SLNG cost in the UK?
US$ 0.0033 per agent minute for the execution layer. Add STT or TTS for US$ 0.0033 each. No contracts. No minimums.
What does the SLNG execution layer run in the UK?
LLM routing, smart caching, PII redaction, transcripts, and analytics on UK compute.
Does my voice AI data stay in-region?
Yes. Audio processed in a region stays in that region. Data residency is enforced at the routing layer, not promised in documentation. Every call is logged with region, provider, model, and timestamp. SLNG is ISO 27001 certified, HIPAA compliant, and GDPR compliant.
What regions does SLNG support for voice AI?
11 sovereign hubs: San Francisco, Ashburn, and Council Bluffs in the US. Dublin, London, Stockholm, and Helsinki in Europe. Mumbai, Singapore, Jakarta, and Sydney in Asia Pacific.
How is SLNG priced?
US$ 0.0033 per agent minute for the execution layer. Same price as every other region. STT and TTS add-ons are each US$ 0.0033 per agent minute with model costs included. No contracts, no minimums, no regional surcharges.
What is the SLNG execution layer?
The infrastructure between your orchestrator and your models. It routes each call to the right model, caches repeated patterns, redacts PII, cancels noise, and logs everything: cost, latency, region, provider, per step. You keep your existing code. SLNG handles the layer underneath.
Does SLNG cost more in certain regions?
No. US$ 0.0033 per agent minute for the execution layer in every region. STT and TTS add-ons are each + US$ 0.0033. No regional surcharges. No volume tiers.
How do I integrate SLNG with my voice AI stack?
Swap your STT, LLM, and TTS endpoints to SLNG. Add one header (X-Region) to select your region. No changes to your orchestrator, your models, or your agent logic. Works with LiveKit, Pipecat, Cognigy, or any custom stack.
What does "per agent minute" mean?
Agent minute is the length of the call, not the amount of audio processed. A 3-minute call is 3 agent minutes regardless of how much silence or overlap it contains. SLNG bills per agent minute. Model providers typically bill per audio minute. SLNG simplifies this.
Is SLNG HIPAA compliant for voice AI?
Yes. SLNG is ISO 27001 certified, HIPAA compliant, and GDPR compliant. SOC 2 Type II is in progress. Compliance is enforced at the routing layer. Audio processed in a region stays in that region. Every call is logged with region, provider, model, and timestamp.
Stay in the loop
Define. Execute. Govern. Verify.
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