QSI API

Developer portal · v1.0 private preview · quantumsi.in

Use AI in your product through QSI. You call one endpoint with a QSI API key; QSI runs the model and returns the answer. You never buy, hold or manage any model-provider key — no Moonshot, no OpenAI. QSI handles the model, the limits and the uptime; you get a simple monthly plan.

For developers: one POST request, one header, JSON in → JSON out. OpenAI-style messages, so most existing code connects in minutes.

Quick start

Endpoint: https://quantumsi.in/api/v2/pub.php

Auth: header X-QSI-Key: qsi_live_<your-key> (or Authorization: Bearer).

curl -X POST https://quantumsi.in/api/v2/pub.php \
  -H "Content-Type: application/json" \
  -H "X-QSI-Key: qsi_live_xxxxxxxx" \
  -d '{"action":"chat","messages":[{"role":"user","content":"Hello!"}]}'

{"ok":true,"answer":"Hello! How can I help?","finish":"stop"}

Actions

Action	Who	What it does
`chat` (POST)	any key	Send OpenAI-style `messages`; get the AI answer.
`status` (GET)	any key	Your plan, calls used today/this month, quota remaining.
`issue` / `revoke`	QSI owner	Create or disable keys.

How usage is counted

One call = one completed AI answer. Failed calls are never counted.
Per call: ≤50 messages, each ≤20,000 chars; request ≤100 KB; 20 calls/minute per key.
Counts live on the server per key and reset monthly; check them any time with status.
When the allowance ends: the plan stops, or continues at the overage price per call (set per plan).

Plans (launch offer)

Plan	Price / month	Included calls
Starter	₹199	400
Pro	₹499	1,500
Business	₹1,999	8,000

Prices in INR, billed monthly per key; launch placeholders, GST extra. Custom volumes & annual billing: sarthak@quantumsi.in.

Reliability & rules

Every call passes guards: key valid → not revoked → rate limit → quota → spend ceiling → model. Clear JSON error codes: bad_key, disabled, rate_limited, monthly_cap, spend_ceiling, upstream_error.
A global daily spend ceiling protects the service for everyone.
Keys are stored as hashes on QSI's server — a leak cannot expose them.
CORS enabled; browser apps may call the API directly.

Get a key

During the private preview keys are issued by QSI: pick a plan, complete payment, and the key is emailed to you (shown once) with these docs.

Request Starter key Request Pro key Request Business key ⇩ Full docs (PDF)