Fastn

Fastn provides an integration layer for SaaS applications, enabling unified APIs, workflow automation, and a marketplace for integration agents. It offers a platform where developers can build, version, and govern data pipelines across various SaaS tools, with features like MCP gateway, tool access controls, and AI‑driven agents to simplify complex integrations. Fastn’s solution targets sales, CRM, and product teams seeking to synchronize revenue apps, embed customer integrations, and accelerate product development through a single schema across apps.

Fastn is listed with 2 APIs on the APIs.io network. Tagged areas include Integration Platform, B2B SaaS, Embedded Widget, Unified API, and Data Integration.

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

Fastn’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.9/100 developing ▲ 9.2 Agent 20/100 agent aware Heartbeat 66/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

2 APIs

Integration Platform B2B SaaSEmbedded WidgetUnified API Data Integration AI Agents CRM Integration Security

Kin Score

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

Composite quality — 45.9/100 · developing

Contract Quality 5.1 / 21

Developer Ergonomics 10.5 / 17

Access Clarity 12.7 / 17

Operational Transparency 0.5 / 11

Contract Governance 3.6 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.5 / 15

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 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):

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 →
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 →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 24.0 — up to +19.0 composite points Ask about this →
Operational Transparency scores 4.8 — up to +12.4 composite points Ask about this →
Contract Governance scores 35.6 — up to +7.7 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/fastn/apis.yml: open an issue on github.com/api-evangelist/fastn 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 2

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

Fastn API

Fastn HTTP API reference

Fastn API

Fastn API as documented publicly: 14 operations. Contract generated from the documentation by API Evangelist (2026-10-20); not the provider's own document.

Fastn API pricing

Prices published by Fastn, read 2026-10-20 from fastn.ai/pricing.

Plan	Price
Launch	$0
Scale	$500/month
Enterprise	Custom volume pricing per customer connection

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Fastn Plans Pricing

3 plans

PLANS

Terms of Service 1

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

Fastn

8 quoted statements, read from Fastn's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Fastn

24 quoted statements, read from Fastn's own page on 2026-11-09.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Fastn

3 quoted statements, read from Fastn's own page on 2026-11-09.

ELIGIBILITY

Semantic Vocabularies 1

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

Fastn Context

8 classes · 6 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.

Fastn API Rules

13 rules · 10 error-severity 1 warn-severity 2 info-severity

SPECTRAL

JSON Schema 6

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

PostApiV1EmbedTokenRefreshResponse

2 properties

JSON SCHEMA

PostApiV1EmbedTokenRequest

3 properties

JSON SCHEMA

PostApiV1EmbedTokenResponse

4 properties

JSON SCHEMA

PostApiV1WorkflowsWorkflowidExecuteRequest

1 properties

JSON SCHEMA

PostApiV1WorkflowsWorkflowidExecuteResponse

2 properties

JSON SCHEMA

PostRequest

1 properties

JSON SCHEMA

Security Posture 3

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

Fastn Authentication

1 scheme

SECURITY

Fastn Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Fastn Trust Center

SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Postman

Postman

Access & Security 4

Authentication, authorization, and security posture

Compliance

Authentication

TrustCenter

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

Hosts

Vendors

DataProcessing

Eligibility

Source (apis.yml)

aid: fastn
name: Fastn
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  probe_state: unreadable
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://fastn.ai/og.png
description: Fastn provides an integration layer for SaaS applications, enabling unified APIs, workflow automation, and a
  marketplace for integration agents. It offers a platform where developers can build, version, and govern data pipelines
  across various SaaS tools, with features like MCP gateway, tool access controls, and AI‑driven agents to simplify complex
  integrations. Fastn’s solution targets sales, CRM, and product teams seeking to synchronize revenue apps, embed customer
  integrations, and accelerate product development through a single schema across apps.
url: https://raw.githubusercontent.com/api-evangelist/fastn/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-20 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- Integration Platform
- B2B SaaS
- Embedded Widget
- Unified API
- Data Integration
- AI Agents
- CRM Integration
- Security
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/fastn-plans-pricing.yml
- type: Spectral
  url: rules/fastn-rules.yml
- type: JSONLD
  url: json-ld/fastn-context.jsonld
- type: Vocabulary
  url: vocabulary/fastn-vocabulary.yml
- type: DataModel
  url: data-model/fastn-data-model.yml
- type: Compliance
  url: https://trust.fastn.ai/
- type: Authentication
  url: authentication/fastn-authentication.yml
- type: Conformance
  url: conformance/fastn-conformance.yml
- type: LLMsTxt
  url: llms/fastn-llms.txt
- type: WellKnown
  url: well-known/fastn-well-known.yml
- type: Hosts
  url: hosts/fastn-hosts.yml
- type: Vendors
  url: vendors/fastn-vendors.yml
- type: TrustCenter
  url: security/fastn-trust-center.yml
- type: DomainSecurity
  url: security/fastn-domain-security.yml
- type: Website
  url: https://fastn.ai/
- type: DeveloperPortal
  url: https://fastn.ai/
- type: Documentation
  url: https://docs.fastn.ai/
- type: APIReference
  url: https://docs.fastn.ai/
- type: GettingStarted
  url: https://docs.fastn.ai/fastn/readme/getting-started
- type: Support
  url: https://fastn.ai/support
- type: Blog
  url: https://fastn.ai/blog
- type: GitHubOrganization
  url: https://github.com/fastn-ai
- type: Pricing
  url: https://fastn.ai/pricing
- type: TermsOfService
  url: https://fastn.ai/terms
- type: PrivacyPolicy
  url: https://fastn.ai/privacy
- type: Postman
  url: https://www.postman.com/fastn/workspace/fastn-api
- type: UsageTerms
  url: terms/fastn-terms-of-service.yml
- type: DataProcessing
  url: privacy/fastn-privacy-policy.yml
- type: Eligibility
  url: eligibility/fastn-eligibility.yml
apis:
- name: Fastn API
  description: Fastn HTTP API reference
  humanURL: https://docs.fastn.ai/reference/api
  baseURL: null
  aid: fastn:fastn-api-2
- aid: fastn:fastn-api
  name: Fastn API
  description: 'Fastn API as documented publicly: 14 operations. Contract generated from the documentation by API Evangelist
    (2026-10-20); not

    the provider''s own document.'
  humanURL: https://docs.fastn.ai/reference/api
  baseURL: https://api.fastn.dev
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/fastn-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/fastn-post-api-v1-embed-token-response-schema.json
  - type: JSONSchema
    url: json-schema/fastn-post-api-v1-embed-token-request-schema.json
  - type: JSONSchema
    url: json-schema/fastn-post-api-v1-workflows-workflowid-execute-response-schema.json
  - type: JSONSchema
    url: json-schema/fastn-post-api-v1-embed-token-refresh-response-schema.json
  - type: JSONSchema
    url: json-schema/fastn-post-request-schema.json
  - type: JSONSchema
    url: json-schema/fastn-post-api-v1-workflows-workflowid-execute-request-schema.json
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: API reference page renders via JavaScript, no machine‑readable OpenAPI found.
  evidence:
  - url: https://docs.fastn.ai/reference/api
    status: 200
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Fastn API — frequently asked questions

Does Fastn have an API?

Yes. APIs.io lists 2 APIs from Fastn, including Fastn API and Fastn API.

Is there an OpenAPI specification for the Fastn API?

Yes. APIs.io indexes 1 OpenAPI specification for Fastn, each linked for download from this page.

How do I authenticate with the Fastn API?

Fastn uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Fastn Authentication.

How much does the Fastn API cost?

Fastn publishes its prices; its Launch plan is $0 as of 2026-10-20. APIs.io lists 3 pricing plans for Fastn, with each plan's price, limits and inclusions under Pricing on this page.

Is the Fastn API ready for AI agents?

Fastn has a Kin Score of 45.9 out of 100 (developing) and an Agent Readiness score of 19.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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