The request names RestSharp, so RestSharp itself comes first: it is a .NET REST client whose documentation describes serialization of XML/JSON bodies and responses, fully async calls with sync overloads, and one-line parameter handling 1. Its page does not list a separate MCP server, API, SDK or CLI door, and no actions are indexed for it. Alternatives that do the same job of making HTTP calls from .NET are Flurl, a fluent URL builder and HTTP client for .NET 8, and, for other languages, the

1. 1

   RestSharprestsharp.devwebsite read, tools not yet checked

   A .NET REST client that serializes and deserializes XML or JSON, offers fully async calls with sync overloads, and adds query, URL and form parameters in one line each 1.

   WebsiteDocs

2. 2

   Flurlflurl.devverified and signed

   A fluent, asynchronous .NET library for building URLs and making HTTP calls, with JSON send and receive helpers 8.

   WebsiteDocs

   for agents: httpclient · rest · http