Introduction

Base URL, rate limits, error format, and authentication for the psxdata REST API.

Base URL

All API requests are made to the following base URL:

https://psxdata-api.fastapicloud.dev

Authentication

No authentication is required. All endpoints are public and can be called directly without API keys or tokens.

Rate limits

Requests are rate-limited to 60 requests per minute per IP address across all endpoints. The limit is enforced by slowapi using the client’s remote IP address.

When the limit is exceeded the API returns HTTP 429 with the rate_limited error code (see Error codes below).

Using the API in a multi-user app

The 60 req/min limit is keyed on the remote IP address that reaches the API, not on individual end users. This matters when you build a frontend (Next.js, React, mobile app) on top of psxdata:

• Calling the API directly from the browser — every user calls from their own IP, so each user has their own 60 req/min budget. In local development, though, every request comes from your single machine and shares one budget, so you will hit 429 quickly while testing.
• Calling the API from your backend (Next.js API route, getServerSideProps, a serverless function, or any server you own) — every request comes from the same server IP, so all of your users share one 60 req/min budget. This will fail under real traffic unless you cache.

For any production, multi-user app the recommended pattern is:

1. Call psxdata from your backend, not the browser.
2. Cache the response on your side (in-memory, Redis, or a database). Historical prices never change; intraday data on psxdata refreshes every 15 minutes, so a 15-minute TTL on quotes and index snapshots is a safe default.
3. Serve subsequent user requests from your cache, and refresh in the background.

One cached fetch on your backend can serve thousands of end users without hitting the limit.

If you also need to work with the data in Python — for example to run analytics or backtests — the psxdata Python SDK talks to PSX directly and caches to disk, so it is not affected by the REST API rate limit.

Response format

Every response — success or error — is a JSON object with a single top-level key.

Success response (single object)

{
  "data": { "...": "..." },
  "meta": {
    "timestamp": "2025-01-15T10:30:00+00:00",
    "cached": false
  }
}

Success response (list)

{
  "data": ["..."],
  "meta": {
    "timestamp": "2025-01-15T10:30:00+00:00",
    "cached": false,
    "count": 100
  }
}

Field	Type	Description
data	object or array	The requested resource(s).
meta.timestamp	ISO 8601 string	Server time at which the response was generated.
meta.cached	boolean	Whether the response was served from cache.
meta.count	integer	Number of items returned. Present on list responses only.

Error response

{
  "error": {
    "status": 429,
    "code": "rate_limited",
    "message": "Rate limit exceeded"
  }
}

Field	Type	Description
error.status	integer	Mirrors the HTTP status code.
error.code	string	Machine-readable error identifier.
error.message	string	Human-readable description of the error.

Error codes

HTTP status	error.code	When it occurs
400	bad_request	Invalid query parameters or request body.
404	not_found	Symbol or resource not found.
422	bad_request	Request validation failed (e.g. missing required field, wrong type).
429	rate_limited	60 requests per minute per IP exceeded.
503	psx_unavailable	The PSX website was unreachable when the request was processed.
500	internal_error	Unexpected server error.

Quick example

Fetch the market summary with a single curl call:

curl -s https://psxdata-api.fastapicloud.dev/market/summary

A successful response looks like:

{
  "data": {
    "kse100": 115432.67,
    "kse30": 36210.45,
    "kmiallshare": 82140.12
  },
  "meta": {
    "timestamp": "2025-01-15T10:30:00+00:00",
    "cached": false
  }
}

Ready to build something? Continue with the quickstart guide.