SaaS teams shipping AI to their own users

Embed paid AI features in your SaaS

Top up balance. Pay an inference fee on routed usage.

Hide prompts and provider keys behind named features
Mint short-lived runtime sessions for each end user
Meter invocations and tokens per workspace and feature
Prepaid owner balance burns down as your users call features

Start free See SDK

SDK quickstart

keystash-sdk

import { createApiKeySdk } from "keystash-sdk";

const sdk = createApiKeySdk({
  baseUrl: "https://api.keystash.dev"
});

await sdk.account.connect(process.env.KEYSTASH_APP_KEY!);

const session = await sdk.runtime.sessions.create({
  spaceId: "acme-prod",
  endUserId: "user_123",
  operationIds: ["summarize_ticket"]
});

const result = await sdk.runtime.invoke({
  operationId: "summarize_ticket",
  input: {
    ticket: "Customer asks for refund after duplicate charge."
  }
}, session.token);

Runtime response

{
  "operationId": "op_01",
  "operationSlug": "summarize_ticket",
  "model": "openai/gpt-5.4-mini",
  "outputText": "Duplicate charge. Refund likely. Escalate billing.",
  "usage": {
    "inputTokens": 212,
    "outputTokens": 36,
    "totalTokens": 248
  }
}

Workspace

acme-prod

Feature

summarize_ticket

Hidden prompt, fixed model

Session

user_123

Short-lived runtime token

This month

18,240 calls

4.8M tokens

Billing

Prepaid balance

Top up, then burn down with usage

Define

One feature per product action
Provider key stays server-side
Prompt stays hidden

Run

Mint runtime sessions per end user
Invoke features from browser or app shell
Keep models and prompts scoped

Meter

Track calls and token usage by workspace
Track usage by feature
Debit owner balance as users run features

SDK first

`sdk.spaces.operations.create(...)`
`sdk.runtime.sessions.create(...)`
`sdk.runtime.invoke(...)`
`sdk.runtime.usage(...)`

Browser-safe flow

App key mints a short-lived runtime session. Runtime session invokes one or more named features.

Hidden prompts

Prompt templates live in KeyStash. The browser only sends feature input.

Pricing

Top up owner balance, then KeyStash burns it down with an inference fee on routed usage.

Create feature

Admin

const feature = await sdk.spaces.operations.create("acme-prod", {
  title: "Summarize ticket",
  slug: "summarize_ticket",
  model: "openai/gpt-5.4-mini",
  systemPrompt: "You summarize support tickets for internal agents.",
  userTemplate: "Ticket:\n{{ticket}}\n\nReturn a concise summary.",
  monthlyInvocationLimit: 10000,
  allowedOrigins: ["https://app.acme.com"]
});

Dashboard preview

summarize_ticket

openai/gpt-5.4-mini

active

Calls

12,842

Tokens

3.2M

Runtime sessions

TTL 15 min

Origin lock app.acme.com

What ships now

Workspaces
App keys
Hidden features
Runtime sessions
Invocation metering
Inference-fee billing