LLM INFERENCE · EU · FLAT RATE
The Meter is Dead. Long live the Token.
Open-weight models served in the EU region you choose, with pinned versions and zero prompt retention. Send as many tokens as your capacity carries; the invoice does not move.
Commons from €149/seat/month Demesne dedicated instances from €3,400/month
Video — coming soon
One Commons seat over twelve months: token volume varies by more than 20×, the invoice does not move.
Commons
From €149/seat/month
One seat per team member in a shared pool. Flat price per seat, unmetered tokens.
Demesne
From €3,400/month
Your own instance. Your own weights. Fixed monthly price, no one else on the hardware.
WHY KINGSLAYER
Predictable cost.
Per-token billing turns every product decision into a cost decision. One fixed monthly price keeps engineering and finance on the same plan.
Pinned versions.
Closed APIs can change model behavior under the same name. Kingslayer model versions are pinned until you choose to upgrade.
EU jurisdiction.
Data processed on US-controlled infrastructure is exposed to US legal process wherever the datacenter sits. Kingslayer processes exclusively in EU datacenters, under EU law.
PRICING
One price to rule them all.
Prices are public. The price on this page is the price on the order form, and it does not change during the contract term.
Commons
SEATS · 1 SEAT = 1 TEAM MEMBER
Volume pricing
Per seat
€134/seat/month
Monthly total
€1,072/month
Billed monthly or annually. The price is fixed for the term.
Every seat includes Unmetered tokens Guaranteed per-stream throughput ¹ Full model context Your pinned EU region Full model catalog
There is no free tier and no anonymous signup.
Demesne
D1
€3,400 /month
D4
€10,900 /month
D8
On quote
| Row | D1 | D2 | D4 | D8 |
|---|---|---|---|---|
| GPUs | 1 × H100 80 GB | 2 × H100 | 4 × H100 | 8 × H100 |
| Fits | ≤ 32B dense; small MoE | 70B-class dense | 70B long-context; mid-size MoE | Large MoE; frontier open weights |
| Throughput envelope | Measured at onboarding ³ | Measured at onboarding ³ | Measured at onboarding ³ | Measured at onboarding ³ |
| Tenancy | Dedicated | Dedicated | Dedicated | Dedicated |
| Price | €3,400 /month | €5,900 /month | €10,900 /month | On quote |
| Actions | Get a quote | Get a quote | Get a quote | Talk to a specialist |
12-month minimum. Quarterly prepayment; annual prepayment −8%. One-time setup fee €1,500 covering onboarding load tests and integration. Resizes at quarter boundaries. Standby replica add-on available. ⁴
All prices in EUR, excluding VAT.
UNMETERED
Tokens are unmetered.
Send as many as your seat can carry. Your invoice is the same in your heaviest month and your quietest.
Every Commons seat and every Demesne instance includes every token its capacity can produce. There are no token tiers, no credits, no overage line, and no throttling to manage a bill. The usage graphs in your console are for your information. They are never a bill.
- Token tiers
- None.
- Credits
- None.
- Overage billing
- None, ever. Upgrades are more concurrency, more keys, more regions, better support.
- Context window
- The model's full context, on every plan.
INVOICE
Kingslayer · Bill to: your company
Period 2027-04 → 2027-06
Commons · 8 seats · 3 months
€3,216
Tokens generated in period · 471,220,904
not billed
Seats in use at peak · 8 of 8
included
Total due (excl. VAT)
€3,216
CONCURRENCY
We meter concurrency, not tokens.
A seat is a fixed number of concurrent requests with a guaranteed throughput per stream. Inside it, tokens are unmetered.
Concurrency is what makes the flat price possible: each seat comes with known parallel capacity, so your costs stay predictable while your traffic grows. Your console shows your headroom in real time, and when you need more, you simply move up a seat.
- Within your cap
- Guaranteed per-stream throughput: p50 ≥ 25 tokens/s on 70B-class models. ¹
- Over your cap
- Requests queue for up to 2 s, then receive HTTP 429 with a Retry-After header. Deterministic and documented.
- Time to first token
- p95 < 800 ms, in-region, within your cap. ¹
- Need more
- Add seats as your team grows; every seat carries the same guaranteed capacity. Volume pricing applies from 8 seats.
Video — coming soon
Concurrency in practice: eight streams at work, and exactly what happens over the cap.
DEDICATED · DEMESNE
Your own instance. No one else on the hardware.
Demesne is a dedicated inference instance: dedicated GPUs, dedicated hosts, a dedicated endpoint, run by Kingslayer as a managed service.
You control the three things a shared API never lets you control.
The model
Any compatible open-weight model: from the Kingslayer catalog, from the open ecosystem after license review, or your own fine-tunes and LoRA adapters.
The version
Pinned indefinitely. Upgrades happen when you schedule them, in your maintenance window, with a rollback path kept for 7 days.
The territory
Region selected at signature. The data plane never leaves it. Private connectivity available: IP allowlist, mTLS, WireGuard tunnel.
- Tenancy
- Dedicated GPUs and hosts. No shared inference process. No shared KV or prefix cache. No GPU slicing across customers, ever.
- Control plane
- Sees health, metrics, and configuration only. It never sees request content.
- Capacity
- A throughput envelope measured with your own traffic at onboarding, published to you as your numbers, and used as your SLO baseline.
DEMESNE · D2
DATA PLANE · SEALED
2 × H100 · dedicated GPUs and hosts
{name}.demesne.kingslayer.eu
model · pinned until you schedule an upgrade
region · fr-par-1 · the data plane never leaves it
prompts and completions stay inside
CONTROL PLANE
health
metrics
configuration
telemetry · outbound only
Only telemetry crosses the tenancy boundary. Request content never does.
SOVEREIGN · OPEN
Your region. Your weights.
EU legal entity. EU datacenters. Open-weight models with published checksums. In writing, on every order form.
Sovereign
- Region pinning
- Each API key is pinned to a region at creation. Requests on that key are processed in that region only. There is no silent failover; cross-region failover is opt-in per key.
- Zero retention
- Prompts and completions are never written to disk. What we keep: timestamps, token counts, latency, model, and status, for operations and your dashboard.
- Jurisdiction
- Processing exclusively in EU datacenters, under EU law. GDPR DPA standard with every order form. Sub-processor list published and versioned.
Open
- Open weights only
- Every catalog entry publishes exact version, source, license, quantization, and the SHA-256 of its weights.
- Immutable model IDs
- An ID like qwen3-32b-fp8-2026a never changes what it points to. Aliases such as latest exist and are opt-in.
- Deprecation
- 90 days written notice, a migration guide, and a side-by-side evaluation window.
API KEY
CATALOG ENTRY
COMMONS OR DEMESNE
Which one do you need?
Commons
A seat in a shared pool.
Demesne
Your own instance.
Commons customers see in their console when a dedicated instance would serve them better, before any sales outreach.
INTEGRATION
Integration is a base URL change.
The API is OpenAI-compatible. Existing SDKs work unchanged.
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.kingslayer.eu/v1",
api_key=os.environ["KINGSLAYER_API_KEY"],
)
stream = client.chat.completions.create(
model="qwen3-32b-fp8-2026a",
messages=[{"role": "user", "content": "Summarize this clause."}],
stream=True,
)- Endpoints
- POST /v1/chat/completions, streaming and non-streaming. GET /v1/models.
- Structured output
- JSON-schema-guided decoding. Tool calling where the model supports it.
- Response headers
- Every response carries its region and its model pin, plus your current concurrency headroom.
- Errors
- OpenAI-shaped error envelopes. Over-cap requests return 429 with Retry-After.
FAQ
Frequently asked questions.
What does "unmetered" mean?
Inside your seat or instance, tokens are not counted toward your bill. There are no token tiers, credits, or overage charges. The limit is concurrency: how many requests run at once.
What happens when I exceed my concurrency cap?
Requests above your cap queue for up to 2 seconds. If a stream does not free up, the request receives HTTP 429 with a Retry-After header. Nothing is billed, nothing is dropped silently, and your console shows your headroom in real time.
Where is my data processed, and what do you keep?
In the EU region pinned to your API key, and nowhere else unless you opt in to cross-region failover. Prompts and completions are never written to disk. We keep request metadata: timestamps, token counts, latency, model, and status.
Which models can I use?
Commons serves an open-weight catalog; every entry publishes its version, source, license, quantization, and SHA-256. Demesne runs any compatible open-weight model, including your own fine-tunes and LoRA adapters, after license review.
Do model versions change without notice?
No. Model IDs are immutable. You upgrade when you decide. Deprecations come with 90 days written notice, a migration guide, and a side-by-side evaluation window.
How do I migrate from another OpenAI-compatible API?
Change the base URL and the model ID. Chat completions, streaming, structured output, and tool calling use the same request and response shapes.
Is there a free tier or self-serve signup?
No. Kingslayer sells to businesses under a signed order form.
How are contracts and payments structured?
Commons is billed per seat, monthly or annually, with volume pricing from 8 seats. Demesne profiles are annual contracts with quarterly prepayment and offer −8% for annual prepayment. Prices are in EUR, excluding VAT, and do not change during the term.
Who is behind Kingslayer?
An EU-based company. Processing is performed exclusively in EU datacenters; the GPU providers are listed as sub-processors in the DPA.
Unmetered. Sovereign. Open.
Tell us your traffic shape and your compliance requirements. You receive a quote and a draft order form, with every contract document available before signature.
- Throughput and time-to-first-token targets are measured at the gateway, in-region, within the seat’s concurrency cap, on 70B-class models served at FP8. Smaller models are faster; the targets are floors, not typical values.
- Prices in EUR, excluding VAT. Commons is billed per seat, monthly or annually, with volume pricing from 8 seats. Demesne profiles are annual contracts with quarterly prepayment. Prices are fixed for the contract term and are identical here and on the order form.
- Demesne throughput envelopes depend on model, context length, and traffic shape. They are measured with the customer’s own prompts during onboarding, published to the customer, and used as the SLO baseline.
- Standby replica: a second instance in the same region for faster failover, priced at 60% of the profile price. The setup fee covers onboarding load tests and integration support.