Polly

Polly is a .NET resilience and transient-fault-handling library that allows developers to express resilience strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Limiter, and Fallback in a fluent and thread-safe manner. A .NET Foundation member project.

Polly is listed with 1 API on the APIs.io network. Tagged areas include .NET, C#, Circuit Breaker, Fault Tolerance, and Microservices.

The Polly catalog on APIs.io includes 1 Spectral governance ruleset.

Polly’s developer surface includes documentation, GitHub presence, release notes, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

13.0/100 emerging ▬ flat Agent 1/100 human only Front door AI 3/6 light Heartbeat 62/100 alive self hosted · BSD-3-Clause Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 API

.NET C#Circuit Breaker Fault Tolerance Microservices Rate Limiter Resilience RetryTimeout

Kin Score

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

Composite quality — 13.0/100 · emerging

Contract Quality 1.5 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 1.1 / 17

Operational Transparency 2.9 / 11

Contract Governance 1.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 0.0 / 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 7.2 — up to +23.2 composite points Ask about this →
Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 9.5 — up to +18.1 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/polly/apis.yml: open an issue on github.com/api-evangelist/polly 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.

Polly

Polly is a .NET resilience and transient-fault-handling library that allows developers to express resilience strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Li...

Polly API pricing

Not yet checked against Polly'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 Polly's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Polly Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Polly Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Polly Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Polly — jsonschema rules

6 rules · 5 warn-severity 1 info-severity

SPECTRAL

JSON Schema 1

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

Polly Resilience Pipeline Configuration

1 properties

JSON SCHEMA

Security Posture 1

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

Polly Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Issues

Issues

ReleaseNotes

ReleaseNotes

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

BlogRSS

BlogRSS

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

NuGet

NuGet

Source (apis.yml)

aid: polly
name: Polly
description: Polly is a .NET resilience and transient-fault-handling library that allows developers to express resilience
  strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Limiter, and Fallback in a fluent and thread-safe manner.
  A .NET Foundation member project.
type: Index
deliveryModel:
  model: self-hosted
  license: BSD-3-Clause
  license_evidence:
    repo: app-vnext/polly
    spdx: BSD-3-Clause
    stars: 14235
  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/polly.png
tags:
- .NET
- C#
- Circuit Breaker
- Fault Tolerance
- Microservices
- Rate Limiter
- Resilience
- Retry
- Timeout
url: https://raw.githubusercontent.com/api-evangelist/polly/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: polly:polly
  name: Polly
  description: Polly is a .NET resilience and transient-fault-handling library that allows developers to express resilience
    strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Limiter, and Fallback in a fluent and thread-safe manner.
  humanURL: https://www.thepollyproject.org
  tags:
  - .NET
  - C#
  - Circuit Breaker
  - Fault Tolerance
  - Microservices
  - Rate Limiter
  - Resilience
  - Retry
  - Timeout
  properties:
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/polly/refs/heads/main/json-schema/resilience-pipeline-configuration.json
common:
- type: Plans
  url: plans/polly-plans-pricing.yml
- type: RateLimits
  url: rate-limits/polly-rate-limits.yml
- type: FinOps
  url: finops/polly-finops.yml
- url: https://thepollyproject.org/feed
  type: BlogRSS
- type: DomainSecurity
  url: security/polly-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/pollyex
- type: Website
  url: https://www.thepollyproject.org
- type: Documentation
  url: https://www.pollydocs.org/
- type: GitHub
  url: https://github.com/App-vNext/Polly
- type: NuGet
  url: https://www.nuget.org/packages/Polly
- type: Issues
  url: https://github.com/App-vNext/Polly/issues
- type: ReleaseNotes
  url: https://github.com/App-vNext/Polly/releases
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Polly API — frequently asked questions

Does Polly have an API?

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

How much does the Polly API cost?

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

Is the Polly API ready for AI agents?

Polly has a Kin Score of 13.0 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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