Fly Frugal

Fly Frugal provides a public travel data API and MCP that offers read‑only access to flight deal previews, itinerary data, and verified savings. The service aggregates fare observations, compares them with price‑insight sources, and presents only deals verified as savings for the current day. It aims to help developers and AI assistants integrate flight‑deal data without authentication, while offering documentation, pricing, and contact pages on its site.

Fly Frugal publishes 6 API contracts indexed on the APIs.io network, including Calendar API, Catalog API, Deals API, and 3 more. Tagged areas include Travel, Data, MCP, Flight Deals, and Company.

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

Fly Frugal’s developer surface includes documentation, API reference, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.8/100 emerging Agent 20/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract

Travel Data MCPFlight DealsCompany

Kin Score

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

Composite quality — 25.8/100 · emerging

Contract Quality 10.6 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 1.4 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.3 / 15

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 8 / 8

Request/Response Examples 0 / 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 →
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 →
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 →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link 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):

Access Clarity scores 8.5 — up to +18.3 composite points Ask about this →
Developer Ergonomics scores 16.7 — up to +16.7 composite points Ask about this →
Operational Transparency scores 0.0 — up to +13.0 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/flyfrugal-fyi/apis.yml: open an issue on github.com/api-evangelist/flyfrugal-fyi 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Fly Frugal Calendar API

The Calendar API from Fly Frugal — 1 operation(s) for calendar.

Fly Frugal Catalog API

The Catalog API from Fly Frugal — 1 operation(s) for catalog.

Fly Frugal Deals API

The Deals API from Fly Frugal — 1 operation(s) for deals.

Fly Frugal History API

The History API from Fly Frugal — 1 operation(s) for history.

Fly Frugal Itineraries API

The Itineraries API from Fly Frugal — 2 operation(s) for itineraries.

Fly Frugal Weather API

The Weather API from Fly Frugal — 1 operation(s) for weather.

Semantic Vocabularies 1

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

Flyfrugal Fyi Context

3 classes · 32 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.

Fly Frugal API Rules

32 rules · 30 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 2

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

FlightDeal

20 properties

JSON SCHEMA

ItineraryPreview

12 properties

JSON SCHEMA

Security Posture 1

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

Fly Frugal Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Fly Frugal Agentic Access

14 operations

14 operations · 0 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Contact

Contact

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: flyfrugal-fyi
name: Fly Frugal
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://flyfrugal.fyi/og/deal.png
description: Fly Frugal provides a public travel data API and MCP that offers read‑only access to flight deal previews, itinerary
  data, and verified savings. The service aggregates fare observations, compares them with price‑insight sources, and presents
  only deals verified as savings for the current day. It aims to help developers and AI assistants integrate flight‑deal data
  without authentication, while offering documentation, pricing, and contact pages on its site.
url: https://artifacts.apis.io/flyfrugal-fyi/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-08 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-08'
modified: '2026-11-08'
tags:
- Travel
- Data
- MCP
- Flight Deals
- Company
tags_raw:
- Travel
- Data
- API
- MCP
- Flight Deals
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/flyfrugal-fyi-agentic-access.yml
- type: Spectral
  url: rules/flyfrugal-fyi-rules.yml
- type: JSONLD
  url: json-ld/flyfrugal-fyi-context.jsonld
- type: Vocabulary
  url: vocabulary/flyfrugal-fyi-vocabulary.yml
- type: DataModel
  url: data-model/flyfrugal-fyi-data-model.yml
- type: ErrorCatalog
  url: errors/flyfrugal-fyi-problem-types.yml
- type: Conformance
  url: conformance/flyfrugal-fyi-conformance.yml
- type: LLMsTxt
  url: llms/flyfrugal-fyi-llms.txt
- type: Hosts
  url: hosts/flyfrugal-fyi-hosts.yml
- type: Vendors
  url: vendors/flyfrugal-fyi-vendors.yml
- type: DomainSecurity
  url: security/flyfrugal-fyi-domain-security.yml
- type: Website
  url: https://flyfrugal.fyi/
- type: Documentation
  url: https://flyfrugal.fyi/docs
- type: APIReference
  url: https://flyfrugal.fyi/docs/openapi.yaml
- type: PrivacyPolicy
  url: https://flyfrugal.fyi/privacy
- type: Contact
  url: https://flyfrugal.fyi/contact
apis:
- aid: flyfrugal-fyi:flyfrugal-fyi-calendar-api
  name: Fly Frugal Calendar API
  description: The Calendar API from Fly Frugal — 1 operation(s) for calendar.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - Calendar
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-calendar-api-openapi.yml
- aid: flyfrugal-fyi:flyfrugal-fyi-catalog-api
  name: Fly Frugal Catalog API
  description: The Catalog API from Fly Frugal — 1 operation(s) for catalog.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-catalog-api-openapi.yml
- aid: flyfrugal-fyi:flyfrugal-fyi-deals-api
  name: Fly Frugal Deals API
  description: The Deals API from Fly Frugal — 1 operation(s) for deals.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - Deals
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-deals-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flyfrugal-fyi-flight-deal-schema.json
- aid: flyfrugal-fyi:flyfrugal-fyi-history-api
  name: Fly Frugal History API
  description: The History API from Fly Frugal — 1 operation(s) for history.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - History
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-history-api-openapi.yml
- aid: flyfrugal-fyi:flyfrugal-fyi-itineraries-api
  name: Fly Frugal Itineraries API
  description: The Itineraries API from Fly Frugal — 2 operation(s) for itineraries.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - Itineraries
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-itineraries-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flyfrugal-fyi-itinerary-preview-schema.json
- aid: flyfrugal-fyi:flyfrugal-fyi-weather-api
  name: Fly Frugal Weather API
  description: The Weather API from Fly Frugal — 1 operation(s) for weather.
  humanURL: https://flyfrugal.fyi/docs
  baseURL: https://flyfrugal.fyi
  tags:
  - Weather
  properties:
  - type: OpenAPI
    url: openapi/flyfrugal-fyi-weather-api-openapi.yml
x-enrichment:
  date: '2026-11-08'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Fly Frugal API — frequently asked questions

Does Fly Frugal have an API?

Yes. APIs.io lists 6 APIs from Fly Frugal, including Fly Frugal Calendar API, Fly Frugal Catalog API and Fly Frugal Deals API, and 3 more.

Is there an OpenAPI specification for the Fly Frugal API?

Yes. APIs.io indexes 6 OpenAPI specifications for Fly Frugal, each linked for download from this page.

Is the Fly Frugal API ready for AI agents?

Fly Frugal has a Kin Score of 25.8 out of 100 (emerging) and an Agent Readiness score of 20.1 (agent-aware), scored by API Evangelist on 2026-11-13.

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