SLNG
SLNG is a compliance-first speech AI gateway that gives developers a single, unified API for speech-to-text, text-to-speech, and LLM-driven voice agents across 30+ models from providers like Deepgram, Rime, Cartesia, ElevenLabs, and OpenAI Whisper. The platform acts as an execution layer between an orchestrator and the models, routing each request to in-region compute across 60+ regions and 11 sovereign hubs for low latency and local data residency (GDPR), with ISO 27001 certification and HIPAA compliance. Every model is reachable over HTTP or streaming WebSocket, with bring-your-own-key billing, batch transcription, pronunciation dictionaries, and per-minute pricing. Founded in Barcelona in 2025 and backed by a pre-seed round led by Earlybird.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles SLNG the way a machine reads it — 53 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — SLNG scores 53.7/100 (developing), with a separate agent-readiness read of 30/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile SLNG
Each block below is one kind of artifact we hold for SLNG. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 15
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
SLNG Account API
Inspect the authenticated account and organization.
SLNG Agents API
Voice agent CRUD.
SLNG Calls API
Call dispatch and status.
SLNG Catalog API
Discover and inspect available models in the SLNG catalog.
SLNG Deepgram Aura 2 API
Deepgram Aura 2 for conversational voice agents.
SLNG Deepgram Nova 3 API
Deepgram Nova 3 with VAD and speaker diarization.
SLNG Inworld Max 1.5 API
Inworld Max 1.5 for multilingual, expressive synthesis.
SLNG Orpheus English API
Orpheus TTS with emotion control.
SLNG Pronunciation dictionaries API
Manage reusable pronunciation rewrite dictionaries for TTS.
SLNG Rime Arcana v2 API
Rime Arcana v2 TTS with multi-language support.
SLNG Rime Arcana v3 API
Rime Arcana v3 TTS with multilingual support (English, Hindi).
SLNG Rime Coda API
Rime Coda TTS for Bahasa Indonesian.
SLNG Sessions API
Web (non-telephony) sessions.
SLNG Speechmatics API
Create and manage asynchronous transcription jobs.
SLNG Whisper Large v3 API
Whisper Large v3 with 99+ language support.
Scroll within the panel for all 15 ·
Postman Collections 15
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Scroll within the panel for all 15 ·
Open Collections 16
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONSLNG Voice Agents Account API
OPEN COLLECTIONSLNG Voice Account Agents API
OPEN COLLECTIONSLNG Voice Agents Account Calls API
OPEN COLLECTIONSLNG Voice Agents Account Catalog API
OPEN COLLECTIONSLNG Voice Agents Account Deepgram Aura 2 API
OPEN COLLECTIONSLNG Voice Agents Account Deepgram Nova 3 API
OPEN COLLECTIONSLNG Voice Agents Account Inworld Max 1.5 API
OPEN COLLECTIONSLNG Voice Agents Account Orpheus English API
OPEN COLLECTIONSLNG Voice Agents Account Pronunciation dictionaries API
OPEN COLLECTIONSLNG Voice Agents Account Rime Arcana v2 API
OPEN COLLECTIONSLNG Voice Agents Account Rime Arcana v3 API
OPEN COLLECTIONSLNG Voice Agents Account Rime Coda API
OPEN COLLECTIONSLNG Voice Agents Account Sessions API
OPEN COLLECTIONSLNG Voice Agents Account Speechmatics API
OPEN COLLECTIONSLNG Voice Agents Account Whisper Large v3 API
OPEN COLLECTIONScroll within the panel for all 16 ·
Event Specifications 3
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for SLNG — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 5
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 4
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/slng · machine-readable index on apis.io
This is an independent, third-party profile of SLNG, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.