Home / Historical Data / Data API

Free Data API

Free OHLC Preview & Data Quality API

Q: What formats does the OHLC API return?

JSON by default, or CSV with format=csv. Parquet is available through the download builder, not the API.

Query historical forex, gold, index, energy and crypto data by symbol, timeframe and date range. JSON or CSV, no key required, with clear rate limits and quality reports.

Updated 2026-11-02 ? 617 datasets ? 22.1M OHLC rows

617datasets available

60/minanonymous rate limit

2kpreview rows per request

31dpreview date range

Need full history? The API is a free preview. Complete CSV, ZIP and Parquet datasets are available as paid downloads. View data pricing.

Base URL

https://www.algospecial.com

No API key required. Requests are rate-limited per IP. Timestamps are broker server time. Some legacy forex exports have no tick volume/spread; those fields return 0.

API guides by market

Use the focused guides for supported symbols, timeframe coverage, request examples and market-specific data notes.

XAUUSD gold API

Gold M1 to MN1 history, 1.8M rows and a 97 A quality score.

Forex API

202 forex-group datasets across majors and crosses.

Crypto API

BTC, ETH, SOL and 30+ altcoin symbols with 24/7 bars.

Indices API

US500, USTEC, US30, UK100, STOXX50, JP225 and AUS200.

Energy API

WTI, Brent and natural gas OHLC history.

Quality API

A-F scores, gaps, duplicates and OHLC integrity checks.

Python guide

Requests, pandas, chunking and 429 retry examples.

CSV and JSON

Field definitions and the best format for your workflow.

Rate limits

Headers, status codes and safe retry behaviour.

OHLC Endpoint

GET /api/ohlc.php

Parameter	Required	Description
symbol	Yes	Example: XAUUSD, EURUSD, BTCUSDT, USTEC
tf	Yes	M1, M5, M15, M30, H1, H4, D1, W1, MN1
from	Yes	YYYY-MM-DD
to	Yes	YYYY-MM-DD
format	No	json (default) or csv

Example

curl "https://www.algospecial.com/api/ohlc.php?symbol=XAUUSD&tf=M15&from=2026-01-01&to=2026-01-31&format=json"

Python

import requests

r = requests.get("https://www.algospecial.com/api/ohlc.php", params={
    "symbol": "XAUUSD",
    "tf": "M15",
    "from": "2026-01-01",
    "to": "2026-01-31",
    "format": "json"
}, timeout=30)
data = r.json()["data"]

Data Quality Endpoint

GET /api/data-quality.php

Returns the A–F quality report for a dataset: score, grade, coverage, duplicates, gaps, OHLC violations, outliers, volume/spread checks and issue list.

curl "https://www.algospecial.com/api/data-quality.php?symbol=XAUUSD&tf=M15"

Rate Limits & Errors

Anonymous

60 requests/minute
1,000 requests/day
per IP address

Response headers

X-RateLimit-Limit
X-RateLimit-Remaining
X-RateLimit-Reset

Status codes

200 OK · 400 invalid input · 404 not found · 413 too many rows · 429 rate limited · 500 server error

On 429, wait for the number of seconds in Retry-After. CORS is enabled for browser requests.

Usage & Attribution

The API is free for research, backtesting and commercial applications. Do not resell or redistribute it as a standalone data service. Attribution to AlgoSpecial is appreciated. Data is provided as-is without warranty; verify it against your broker before trading.

API FAQ

Is the OHLC API free?

Yes. The API is free with a per-IP rate limit of 60 requests per minute and 1,000 requests per day.

What formats does the OHLC API return?

JSON by default, or CSV with format=csv. Parquet is available through the download builder, not the API.

How many rows can I request?

The free preview API is limited to 2,000 rows and a maximum date range of 31 days. Full-history datasets are available as paid downloads.

What timezone are timestamps in?

Timestamps are broker server time. Convert to UTC or New York time for session-based strategies.

Continue Your Build

Choose the next useful step

Most visitors arrive with one question: build, test, price, or trust. These shortcuts keep the path practical.

Get a Quote See Pricing

Trust Client Reviews See verified feedback before hiring a solo MT4/MT5 developer. Proof Case Studies Review dashboards, backtests, overlays and market-structure builds. Tools Free Calculators Check pip value, lot size, drawdown, spread, swap and prop-firm risk. Build EA Development Turn the idea into MQL4/MQL5 code with source and testing.

Technical reading path

Go deeper before you build, download or automate

Hand-picked engineering articles, indicator breakdowns and trading-system tools so visitors keep exploring instead of leaving after one page.

Conversion Architecture

Pine Script to MT4/MT5 Conversion Planner

Analyze Pine strategies, repainting risk, TradingView alert bridges, MTF synchronization and the correct MQL4/MQL5 build path before paying for conversion.

Open planner

Source-Code Bundle

3-in-1 MT5 Indicator Bundle

12H Bias Engine, Smart Money Institutional Flow Dashboard and D1/H1 pending-signal logic with MQ5 + EX5 source included via Etsy.

Free Indicator

MT5 Bank Orders Institutional Flow Dashboard

Supply/demand zones, BOS/CHoCH, liquidity levels, FVG, equal highs/lows and confirmed trade-plan logic explained with EX5 download.

Session Liquidity

MT5 Asia London NY Liquidity Engine

Asia range, London raid and New York continuation/reversal planning with internal session backtest stats and entry/SL/TP dashboard.

Python Trading App

Interactive Brokers RSI Pair Trader

Tkinter desktop trading workflow, TWS API connection handling, RSI pair logic, risk controls and custom IBKR development positioning.

Historical Data

XAUUSD M30 CSV Data For Backtesting

Use clean MT5 historical data for Python backtests, strategy validation, spread checks and realistic gold EA research workflows.