SAML

SAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and authorization data between identity providers and service providers. Ratified as an OASIS Standard in March 2005, SAML 2.0 enables single sign-on (SSO) across different applications and domains, reducing the need for users to manage multiple sets of credentials. It uses XML digital signatures and encryption to secure assertions exchanged between Identity Providers (IdP) and Service Providers (SP).

SAML publishes 3 APIs on the APIs.io network: Metadata API, SLO API, and SSO API. Tagged areas include Authentication, Authorization, Federation, Identity Management, and Open Standard.

The SAML catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

SAML’s developer surface includes documentation, code examples, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

28.2/100 thin ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemium

1 APIs

Authentication Authorization Federation Identity Management Open Standard Security Single Sign-On SSO XML

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 28.2/100 · thin

Contract Quality 12.8 / 23

Developer Ergonomics 1.7 / 18

Access Clarity 2.8 / 18

Operational Transparency 0.9 / 12

Contract Governance 3.1 / 11

Discoverability 4.7 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 7 / 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

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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/saml: 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 3

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

SAML Metadata API

SAML 2.0 metadata retrieval.

SAML SLO API

SAML 2.0 Single Logout operations.

SAML SSO API

SAML 2.0 Single Sign-On operations.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

SAML 2.0 SSO HTTP Bindings Metadata API

OPEN COLLECTION

SAML 2.0 SSO HTTP Bindings Metadata SLO API

OPEN COLLECTION

SAML 2.0 HTTP Bindings Metadata SSO API

OPEN COLLECTION

SAML 2.0 SSO HTTP Bindings

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Saml Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Saml Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Saml Finops

FINOPS

Semantic Vocabularies 1

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

Saml Context

7 classes · 35 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

SAML API Rules

6 rules · 4 warnings 2 info

SPECTRAL

SAML API Rules

9 rules · 2 errors 5 warnings 2 info

SPECTRAL

JSON Schema 3

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

SAML 2.0 Assertion

8 properties

JSON SCHEMA

SAML 2.0 AuthnRequest

13 properties

JSON SCHEMA

SAML 2.0 EntityDescriptor Metadata

8 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Saml Assertion Structure

0 properties

JSON STRUCTURE

Examples 1

Example request and response payloads for these APIs.

Saml Sso Redirect Example

4 fields

EXAMPLE

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Saml Agentic Access

5 operations · 2 acting

AGENTIC

Resources

Documentation 8

Reference material describing how the API behaves

SAML 2.0 OASIS Standard

Documentation

SAML 2.0 Technical Overview

Documentation

SAML 2.0 Core Specification

Documentation

SAML 2.0 Bindings Specification

Documentation

SAML 2.0 Profiles Specification

Documentation

SAML 2.0 EntityDescriptor Metadata

JSONSchema

SAML 2.0 AuthnRequest

JSONSchema

SAML 2.0 Assertion

JSONSchema

Scroll for all 8

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

SAML 2.0 JSON-LD Context

JSONLDContext

SAML 2.0 Assertion Structure

JSONStructure

SAML API Spectral Rules

SpectralRules

SAML 2.0 Vocabulary

Vocabulary

Build 1

SDKs, sample code, and the tooling you integrate with

SAML SSO HTTP Redirect Binding Example

Examples

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
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/saml.png
name: SAML
description: SAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and authorization
  data between identity providers and service providers. Ratified as an OASIS Standard in March 2005, SAML 2.0 enables single
  sign-on (SSO) across different applications and domains, reducing the need for users to manage multiple sets of credentials.
  It uses XML digital signatures and encryption to secure assertions exchanged between Identity Providers (IdP) and Service
  Providers (SP).
url: https://www.oasis-open.org/standard/saml/
tags:
- Authentication
- Authorization
- Federation
- Identity Management
- Open Standard
- Security
- Single Sign-On
- SSO
- XML
created: '2025-01-01'
modified: '2026-05-19'
apis:
- aid: saml:saml-metadata-api
  name: SAML Metadata API
  description: SAML 2.0 metadata retrieval.
  tags:
  - Metadata
  properties:
  - type: OpenAPI
    url: openapi/saml-metadata-api-openapi.yml
  - type: Documentation
    url: https://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
- aid: saml:saml-slo-api
  name: SAML SLO API
  description: SAML 2.0 Single Logout operations.
  tags:
  - SLO
  properties:
  - type: OpenAPI
    url: openapi/saml-slo-api-openapi.yml
  - type: Documentation
    url: https://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
- aid: saml:saml-sso-api
  name: SAML SSO API
  description: SAML 2.0 Single Sign-On operations.
  tags:
  - SSO
  properties:
  - type: OpenAPI
    url: openapi/saml-sso-api-openapi.yml
  - type: Documentation
    url: https://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
common:
- type: Website
  url: https://www.oasis-open.org/
- type: AgenticAccess
  url: agentic-access/saml-agentic-access.yml
- type: Documentation
  url: https://www.oasis-open.org/standard/saml/
  title: SAML 2.0 OASIS Standard
- type: Documentation
  url: https://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html
  title: SAML 2.0 Technical Overview
- type: Documentation
  url: https://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf
  title: SAML 2.0 Core Specification
- type: Documentation
  url: https://docs.oasis-open.org/security/saml/v2.0/saml-bindings-2.0-os.pdf
  title: SAML 2.0 Bindings Specification
- type: Documentation
  url: https://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf
  title: SAML 2.0 Profiles Specification
- type: JSONSchema
  url: json-schema/saml-entity-descriptor.json
  title: SAML 2.0 EntityDescriptor Metadata
- type: JSONSchema
  url: json-schema/saml-authn-request.json
  title: SAML 2.0 AuthnRequest
- type: JSONSchema
  url: json-schema/saml-assertion.json
  title: SAML 2.0 Assertion
- type: JSONLDContext
  url: json-ld/saml-context.jsonld
  title: SAML 2.0 JSON-LD Context
- type: JSONStructure
  url: json-structure/saml-assertion-structure.json
  title: SAML 2.0 Assertion Structure
- type: SpectralRules
  url: rules/saml-rules.yml
  title: SAML API Spectral Rules
- type: Examples
  url: examples/saml-sso-redirect-example.json
  title: SAML SSO HTTP Redirect Binding Example
- type: Vocabulary
  url: vocabulary/saml-vocabulary.yml
  title: SAML 2.0 Vocabulary

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/saml"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/saml/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/saml/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.