Finance API

Supported Data Sources

• TEFAS
• Yahoo Finance

Usage

Running the server

Download from releases

./finance-api serve

Assing to a different port

./finance-api serve --http=0.0.0.0:8080

Run from the source

go run main.go serve

Docker

docker compose up -d

Routes

TEFAS

http://127.0.0.1:8090/api/v1/tefas/funds/:code

:code is the code of the fund to be fetched.

Yahoo Finance

http://127.0.0.1:8090/api/v1/yahoo/symbols/:symbol

:symbol is the symbol of the stock to be fetched. For example, for THYAO.IS :symbol is THYAO.IS.

Admin UI

http://127.0.0.1:8090/_

Default email is admin@example.com and password is 1234567890.

Query parameters

• startDate: Start date of the data to be fetched. Format: YYYY-MM-DD
• endDate: Optional, if not provided today will be used. End date of the data to be fetched. Format: YYYY-MM-DD
• currency: Currency of the data to be fetched. Can be either TRY or USD
  • Note: Currently changing currency has no effect on the data.
• format: Optional. Format of the data to be fetched. Available formats: json or csv. Default is json.

http://127.0.0.1:8090/api/v1/yahoo/symbols/THYAO.IS?startDate=2023-06-01&endDate=2023-09-30&currency=TRY

Use with Pandas

import pandas as pd

API_URL = 'http://127.0.0.1:8090'

def get_data(symbol, start_date, end_date):
    url = f'{API_URL}/api/v1/yahoo/symbols/{symbol}?startDate={start_date}&endDate={end_date}&format=csv'
    df = pd.read_csv(url, parse_dates=['Date'])
    df.set_index('Date', inplace=True)
    return df

Use as a Go package

Both tefas and yahoo packages can be used independently from the web API, and they implement Scraper interface.

type Scraper interface {
	GetSymbolData(symbol string, startDate, endDate time.Time) (<-chan *SymbolPrice, error)
}

package main

import (
	"fmt"
	"time"

	"github.com/ahmethakanbesel/finance-api/tefas"
	"github.com/ahmethakanbesel/finance-api/yahoo"
)

func main() {
	ctx := context.Background()

	tefasScraper := tefas.NewScraper(
		tefas.WithWorkers(5),
	)

	// get last year's data for the given fund
	tefasData, err := tefasScraper.GetSymbolData(ctx, "FUNDCODE", time.Now().AddDate(-1, 0, 0), time.Now())
	if err != nil {
		// handle error
	}

	for data := range tefasData {
		fmt.Println(data.Date, data.Close)
	}

	yahooScraper := yahoo.NewScraper(
		yahoo.WithWorkers(5),
	)

	// get last year's data for the given symbol
	yahooData, err := yahooScraper.GetSymbolData(ctx, "SYMBOLCODE", time.Now().AddDate(-1, 0, 0), time.Now())
	if err != nil {
		// handle error
	}

	for data := range yahooData {
		fmt.Println(data.Date, data.Close)
	}
}

Demo

• TEFAS (json)

https://finans.dokuz.gen.tr/api/v1/tefas/funds/HKP?startDate=2023-06-01&endDate=2023-09-30&currency=TRY

• Yahoo Finance (csv)

https://finans.dokuz.gen.tr/api/v1/yahoo/symbols/THYAO.IS?startDate=2023-06-01&endDate=2023-09-30&currency=TRY&format=csv

Web UI

The web UI is incomplete, and it is not ready to work out of the box. The source code can be found under /ui folder.

Preview

Credits

• Pocketbase
• Tremor