RestSharp

RestSharp is a simple REST and HTTP API client library for .NET that wraps HttpClient with a fluent API for making HTTP requests with automatic serialization and deserialization of request and response bodies. Supports JSON, XML, and CSV formats, OAuth1/OAuth2 authentication, async operations, and multi-part form uploads. Available on NuGet as RestSharp (9,800+ GitHub stars, Apache-2.0 license, .NET Foundation project).

RestSharp publishes 1 API on the APIs.io network. Tagged areas include .NET, Apache License, C#, HTTP Client, and NuGet.

The RestSharp catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

RestSharp’s developer surface includes documentation, support, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

20.7/100 emerging ▬ flat Agent 3/100 human only Front door AI 1/6 silent self hosted · Apache-2.0 Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemium

1 API

.NETApache LicenseC#HTTP Client NuGet Open Source SDK

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 20.7/100 · emerging

Contract Quality 2.3 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 2.7 / 17

Operational Transparency 2.9 / 11

Contract Governance 1.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/restsharp: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

RestSharp

RestSharp is a simple REST and HTTP API client library for .NET, wrapping HttpClient with a fluent API for making HTTP requests with automatic serialization and deserialization ...

Pricing Plans 1

Published pricing tiers and plan structures.

Restsharp Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Restsharp Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Restsharp Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Restsharp Context

25 classes · 4 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

RestSharp API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

RestClientOptions

12 properties

JSON SCHEMA

RestRequest

6 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Restsharp Rest Client Options Structure

0 properties

JSON STRUCTURE

Restsharp Rest Request Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Restsharp Bearer Auth Example

6 fields

EXAMPLE

Restsharp Get Request Example

6 fields

EXAMPLE

Restsharp Post Json Example

6 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Restsharp Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

NuGet Package

NuGet Package

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: restsharp
name: RestSharp
description: RestSharp is a simple REST and HTTP API client library for .NET that wraps HttpClient with a fluent API for making
  HTTP requests with automatic serialization and deserialization of request and response bodies. Supports JSON, XML, and CSV
  formats, OAuth1/OAuth2 authentication, async operations, and multi-part form uploads. Available on NuGet as RestSharp (9,800+
  GitHub stars, Apache-2.0 license, .NET Foundation project).
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  license_evidence:
    repo: restsharp/restsharp
    spdx: Apache-2.0
    stars: 9824
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: medium
  source:
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/restsharp.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- .NET
- Apache License
- C#
- HTTP Client
- NuGet
- Open Source
- SDK
tags_raw:
- .NET
- Apache License
- C#
- HTTP Client
- NuGet
- Open Source
- SDKs
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/restsharp/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-05-02'
specificationVersion: '0.23'
apis:
- aid: restsharp:restsharp
  name: RestSharp
  description: 'RestSharp is a simple REST and HTTP API client library for .NET, wrapping HttpClient with a fluent API for
    making HTTP requests with automatic serialization and deserialization of request and response bodies. Current version:
    114.0.0 (released March 2026). Targets .NET 8.0, .NET Standard 2.0, and .NET Framework 4.7.1.'
  humanURL: https://restsharp.dev/
  tags:
  - .NET
  - C#
  - HTTP Client
  - NuGet
  - Open Source
  tags_raw:
  - .NET
  - C#
  - HTTP Client
  - NuGet
  - Open Source
  - Open-Source
  properties:
  - type: Documentation
    url: https://restsharp.dev/docs/intro/
  - type: GettingStarted
    url: https://restsharp.dev/docs/intro/
  - type: GitHub
    url: https://github.com/restsharp/RestSharp
  - type: NuGet
    url: https://www.nuget.org/packages/RestSharp
  - type: ChangeLog
    url: https://github.com/restsharp/RestSharp/releases
common:
- type: DomainSecurity
  url: security/restsharp-domain-security.yml
- type: Website
  url: https://restsharp.dev/
- type: Documentation
  url: https://restsharp.dev/docs/intro/
- type: GitHubOrganization
  url: https://github.com/restsharp
- type: NuGet Package
  url: https://www.nuget.org/packages/RestSharp
- type: License
  url: https://github.com/restsharp/RestSharp/blob/dev/LICENSE.txt
- type: Support
  url: https://github.com/restsharp/RestSharp/issues
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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