Asin .NET SDK

The official .NET SDK for the Asin Amazon price tracking API.

Track Amazon prices and products with a scheduled watchlist, price history, offers and alerts.

The SDK exposes 11 typed async methods, one per documented endpoint (with required properties checked at compile time), plus a generic RequestAsync.

Requirements

• .NET 8 or newer

Installation

dotnet add package Asin

Get your API key

Sign up for Asin or sign in, then copy your API key from the dashboard. new AsinClient() reads the ASIN_API_KEY environment variable.

Quick start

using Asin;

using var client = new AsinClient();
var response = await client.SearchAmazonAsync(new SearchAmazonParams { Query = "wireless earbuds" });
Console.WriteLine(response.Json);

Parameter classes mirror the API reference. Use response.Deserialize<MyType>() to map the JSON onto your own types.

HTTP methods

Each method uses the HTTP verb of its endpoint. GET and DELETE send parameters in the query string; POST and PATCH send them as a JSON body, except wait on /products/{id}/check, which stays in the query string. Null values are never sent, so target_price cannot be removed through the SDK yet.

Any endpoint

var response = await client.RequestAsync("GET", "/account");

Errors

try
{
    await client.SearchAmazonAsync(new SearchAmazonParams { Query = "wireless earbuds" });
}
catch (AsinApiException exception)
{
    Console.Error.WriteLine($"{exception.StatusCode}: {exception.Message}");
}

Exception	When
AsinConfigurationException	Missing API key, invalid options or unsupported method.
AsinSerializationException	A required parameter is missing or a value can't be sent.
AsinTransportException	Network failure or timeout.
AsinApiException	Non-2xx status (StatusCode, ErrorMessage, ResponseBody, RawResponse).
AsinResponseDecodingException	A success response could not be decoded.

All of them derive from AsinException. Caller cancellation surfaces as OperationCanceledException.

Retries

Requests are retried up to 3 times after a network error, a 408, 429, 500, 502, 503 or 504. Other statuses, such as 400, 401, 402 or 404, and client-side timeouts are not retried. The delay starts at 1 second and grows 1.5× per retry (capped at 30 seconds); a Retry-After header wins.

using var client = new AsinClient(new AsinClientOptions { MaxRetries = 5, RetryDelay = TimeSpan.FromMilliseconds(500) });
await client.SearchAmazonAsync(new SearchAmazonParams { Query = "wireless earbuds" }, new RequestOptions { MaxRetries = 0 }); // one request without retries

Batch requests

BatchAsync runs a function per item with at most 10 in flight (concurrency) and returns one BatchResult per item, in input order. A failing item never stops the others.

string[] inputs = { "wireless earbuds", "mechanical keyboard", "usb-c hub" };
var results = await client.BatchAsync(inputs, (value, ct) =>
    client.SearchAmazonAsync(new SearchAmazonParams { Query = value }, cancellationToken: ct), concurrency: 5);
foreach (var result in results)
{
    if (result.Ok)
    {
        Console.WriteLine(result.Value!.Json);
    }
    else
    {
        Console.Error.WriteLine($"{inputs[result.Index]}: {result.Error!.Message}");
    }
}

Constant	Default	Description
AsinClient.DefaultConcurrency	10	Tasks run at the same time by batch
AsinClient.DefaultTimeout	TimeSpan.FromSeconds(120)	Request timeout
AsinClient.MaxRetries	3	Retry attempts after a network error, a 408/429/5xx
AsinClient.RetryBackoffFactor	1.5	Exponential backoff multiplier
AsinClient.DefaultRetryDelay	TimeSpan.FromSeconds(1)	Delay before the first retry

Configuration

using var client = new AsinClient(new AsinClientOptions
{
    ApiKey = Environment.GetEnvironmentVariable("ASIN_API_KEY"),
    Timeout = TimeSpan.FromSeconds(60), // default 120 s
    HttpClient = myHttpClient,           // optional, you keep ownership
});

Endpoints

11 methods, generated from the OpenAPI document.

Method	HTTP	Description
CheckProductAsync	POST /products/{id}/check	Asks for a check right away (1 credit), at most once per 5 minutes; earlier calls return the product unchanged. A paused product has to be…
DeleteProductAsync	DELETE /products/{id}	Removes the product and its price history.
FetchOffersAsync	POST /offers	Reads the offers on Amazon for 1 credit, refunded if it doesn't answer. A read made in the last 3 hours, by anyone, is returned instead, fo…
GetAccountAsync	GET /account	Your plan, the credits left (monthly allowance and packs), how many products you track and the credits they use per month.
GetAsinHistoryAsync	GET /history	Every price Asin read for an ASIN on a marketplace over the period, whoever tracks it, oldest first, with the lowest, highest and average o…
GetOffersAsync	GET /offers	Who sells the product and at what price, as last read, cheapest first, with Amazon's own price and the cheapest new and used offers (used i…
GetProductAsync	GET /products/{id}	The product's latest state and every price read of the period, oldest first. The history covers every read of this ASIN on this marketplace…
ListProductsAsync	GET /products	Your watchlist, newest first, with each product's latest state and its recent prices (trend). Filter with asin (and marketplace) to know if…
SearchAmazonAsync	GET /search	Amazon search results (up to 60, sponsored included), to find the ASIN of a product. Free, limited to 30 searches per hour.
TrackProductAsync	POST /products	Adds an ASIN, an Amazon link or a short link (amzn.to, a.co…) to your watchlist. The first check runs in the background within seconds (che…
UpdateProductAsync	PATCH /products/{id}	Target price, drop alerts, check interval, or pause. Send only what changes.

All Asin SDKs

SDK	Package	Install
Node.js	@asindev/sdk	npm install @asindev/sdk
Python	asindotdev	pip install asindotdev
Go	asin-go	go get github.com/asindotdev/asin-go
.NET	Asin	dotnet add package Asin
Ruby	asindotdev	gem install asindotdev
PHP	asindotdev/sdk	composer require asindotdev/sdk
Java	asin-java	build from source, see its README
CLI	@asindev/cli	npm install -g @asindev/cli
MCP server	@asindev/mcp	npx -y @asindev/mcp

License

MIT — see LICENSE.