YahooQuotesApi  

Retrieves from Yahoo Finance: quote snapshots, history, dividends, splits, and modules

• .NET 8.0 library
• intellisense support for most properties
• simple and intuitive API
• fault-tolerant
• tested
• dependencies: Polly, NodaTime

Installation

PM> Install-Package YahooQuotesApi

Examples

snapshot

using NodaTime;
using YahooQuotesApi;

YahooQuotes yahooQuotes = new YahooQuotesBuilder().Build();

Snapshot? snapshot = await yahooQuotes.GetSnapshotAsync("AAPL");
if (snapshot is null)
    throw new ArgumentException("Unknown symbol.");

Assert.Equal("Apple Inc.", snapshot.LongName);
Assert.True(snapshot.RegularMarketPrice > 0);

snapshots

YahooQuotes yahooQuotes = new YahooQuotesBuilder().Build();

Dictionary<string, Snapshot?> snapshots = await yahooQuotes.GetSnapshotAsync(["AAPL", "BP.L", "USDJPY=X"]);

Snapshot snapshot = snapshots["BP.L"] ?? throw new ArgumentException("Unknown symbol.");

Assert.Equal("BP p.l.c.", snapshot.LongName);
Assert.Equal("GBP=X", snapshot.Currency.Name);
Assert.True(snapshot.RegularMarketPrice > 0);

price history

YahooQuotes yahooQuotes = new YahooQuotesBuilder()
    .WithHistoryStartDate(Instant.FromUtc(2024, 10, 1, 0, 0))
    .Build();

Result<History> result = await yahooQuotes.GetHistoryAsync("MSFT");
History history = result.Value;

Assert.Equal("Microsoft Corporation", history.LongName);
Assert.Equal("USD=X", history.Currency.Name);
Assert.Equal("America/New_York", history.ExchangeTimezoneName);
DateTimeZone tz = DateTimeZoneProviders.Tzdb.GetZoneOrNull(history.ExchangeTimezoneName) ??
    throw new ArgumentNullException("Unknown timezone");

ImmutableArray<Tick> ticks = history.Ticks;
Tick firstTick = ticks[0];
ZonedDateTime zdt = firstTick.Date.InZone(tz);
// Note that tick time is market open at 9:30 AM.
Assert.Equal(new LocalDateTime(2024, 10, 1, 9, 30, 0), zdt.LocalDateTime);
Assert.Equal(420.69, firstTick.Close, 2); // in USD

price history in base currency

YahooQuotes yahooQuotes = new YahooQuotesBuilder()
    .WithHistoryStartDate(Instant.FromUtc(2024, 10, 1, 0, 0))
    .Build();

Result<History> result = await yahooQuotes.GetHistoryAsync("ASML.AS", "USD=X");
History history = result.Value;

Assert.Equal("ASML Holding N.V.", history.LongName);
Assert.Equal("EUR=X", history.Currency.Name);
Assert.Equal("Europe/Amsterdam", history.ExchangeTimezoneName);
DateTimeZone tz = DateTimeZoneProviders.Tzdb.GetZoneOrNull(history.ExchangeTimezoneName)
    ?? throw new ArgumentException("Unknown timezone.");

BaseTick firstBaseTick = history.BaseTicks[0];
Instant instant = firstBaseTick.Date;
ZonedDateTime zdt = instant.InZone(tz);
Assert.Equal(new LocalDateTime(2024, 10, 1, 17, 30, 0).InZoneLeniently(tz), zdt);
Assert.Equal(820.49, firstBaseTick.Price, 2); // EUR -> USD