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 is listed with 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 engineering blog, documentation, support, and 10 more developer resources.

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19.7/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent Heartbeat 100/100 alive self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 API

.NETApache LicenseC#HTTP Client NuGet Open Source SDK

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 19.7/100 · emerging

Contract Quality 2.3 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 2.2 / 17

Operational Transparency 2.9 / 11

Contract Governance 1.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 1/100 · 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 10.7 — up to +22.3 composite points Ask about this →
Access Clarity scores 12.8 — up to +17.4 composite points Ask about this →
Developer Ergonomics scores 28.6 — up to +14.3 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/restsharp/apis.yml: open an issue on github.com/api-evangelist/restsharp to ask a question or point us at an artifact you publish. 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 ...

RestSharp API pricing

Not yet checked against RestSharp's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against RestSharp's documentation. All 5 limits →

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

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

RestSharp

1 quoted statement, read from RestSharp's own page on 2026-11-10.

TERMS

Data License 1

How its data and outputs may be reused, quoted from its own terms.

RestSharp

2 quoted statements, read from RestSharp's own page on 2026-11-10.

LICENSE

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. Counts are the severity each rule declares, not results of running them.

RestSharp — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

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 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

License

UsageTerms

DataLicense

Company 2

The organization behind the API

Blog

Blog

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: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  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: '2026-10-06'
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: Plans
  url: plans/restsharp-plans-pricing.yml
- type: RateLimits
  url: rate-limits/restsharp-rate-limits.yml
- type: FinOps
  url: finops/restsharp-finops.yml
- url: https://restsharp.dev/blog/
  type: Blog
- 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
- type: UsageTerms
  url: terms/restsharp-terms-of-service.yml
- type: DataLicense
  url: data-license/restsharp-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

RestSharp API — frequently asked questions

Does RestSharp have an API?

Yes. APIs.io lists 1 API from RestSharp, including RestSharp.

How much does the RestSharp API cost?

APIs.io lists 3 pricing plans for RestSharp, with each plan's price, limits and inclusions under Pricing on this page.

Is the RestSharp API ready for AI agents?

RestSharp has a Kin Score of 19.7 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

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