freqblog-com

FreqBlog provides a Music Metadata API that offers BPM, key, mood, and over 25 audio feature fields for tracks queried by name, without requiring a Spotify ID. The service includes free and paid tiers, supports 1,000 to 750,000 requests per month, and covers 1,145+ pre‑analyzed genres across multiple language families. It leverages AcousticBrainz and Essentia for analysis, delivering fast responses and offering back‑fill for missing tracks.

freqblog-com publishes 8 API contracts indexed on the APIs.io network, including Audio API, Backfill API, Catalog API, and 5 more. Tagged areas include Company, Music, API, Audio, and Metadata.

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

freqblog-com’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 18 more developer resources.

🌐 Visit website📡 Profile data on GitHub
52.9/100 developing Agent 40/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
2 published contracts 5 Agent Skills
CompanyMusicAPIAudioMetadata

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 52.9/100 · developing
Contract Quality 13.7 / 21
Developer Ergonomics 10.4 / 17
Access Clarity 5.4 / 17
Operational Transparency 0.6 / 11
Contract Governance 8.1 / 10
Discoverability 5.6 / 9
Regulatory Posture 3.7 / 15
Agent readiness — 40/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 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
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/.
Show this score on your site. Kin Score badge preview for freqblog-com It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/freqblog-com/"><img src="https://apis.io/badge/freqblog-com/card.svg" alt="freqblog-com on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • 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)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
  • Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
  • Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
  • Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
6 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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.
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/freqblog-com/apis.yml: open an issue on github.com/api-evangelist/freqblog-com 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 8

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

freqblog-com Audio API

Audio feature extraction

freqblog-com Backfill API

The Backfill API from freqblog-com — 2 operation(s) for backfill.

freqblog-com Catalog API

Pre-analyzed track catalog — instant name-based lookups

freqblog-com Me API

The Me API from freqblog-com — 1 operation(s) for me.

freqblog-com Request Free Key API

The Request Free Key API from freqblog-com — 1 operation(s) for request free key.

freqblog-com Spotify Compat API

Spotify-shape-compatible routes for endpoints deprecated 2024-11-27. Field names and response structure match Spotify byte-for-byte; numeric values come from this pipeline's ope...

freqblog-com System API

Health and operational endpoints

freqblog-com Utility API

The Utility API from freqblog-com — 1 operation(s) for utility.

Scroll for all 8

Agent Skills 5

Packaged agent skills for driving this provider's APIs from an AI assistant.

freqblog-com-audio-analysis-identify

AGENT SKILL

freqblog-com-backfill-notifications-dismiss

AGENT SKILL

freqblog-com-get-track-details

AGENT SKILL

freqblog-com-manage-webhook

AGENT SKILL

freqblog-com-request-free-key-and-view-portal

AGENT SKILL

Semantic Vocabularies 1

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

Freqblog Com Context

48 classes · 155 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

freqblog-com API Rules

15 rules · 11 errors 2 warnings 2 info

SPECTRAL

JSON Schema 6

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

AudioAnalysisResponse

23 properties

JSON SCHEMA

BulkLookupResponse

6 properties

JSON SCHEMA

EmbeddingResponse

7 properties

JSON SCHEMA

IdentifyResponse

12 properties

JSON SCHEMA

RecommendationsResponse

5 properties

JSON SCHEMA

TrackLookupResponse

44 properties

JSON SCHEMA

Security Posture 2

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

Freqblog Com Authentication

apiKey · 1 scheme

SECURITY

Freqblog Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Freqblog Com Agentic Access

92 operations · 20 acting

92 operations · 20 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

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

AgenticAccess
AgenticAccess
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 JSONLD
JSONLD
 Vocabulary
Vocabulary
 DataModel
DataModel
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

Packages
Packages
 SDKs
SDKs
 GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support
Support
 Contact
Contact

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: freqblog-com
name: freqblog-com
image: https://freqblog.com/og-image.png?v=3
description: FreqBlog provides a Music Metadata API that offers BPM, key, mood, and over 25 audio feature fields for tracks
  queried by name, without requiring a Spotify ID. The service includes free and paid tiers, supports 1,000 to 750,000 requests
  per month, and covers 1,145+ pre‑analyzed genres across multiple language families. It leverages AcousticBrainz and Essentia
  for analysis, delivering fast responses and offering back‑fill for missing tracks.
url: https://artifacts.apis.io/freqblog-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- Music
- API
- Audio
- Metadata
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/freqblog-com-agentic-access.yml
- type: Spectral
  url: rules/freqblog-com-rules.yml
- type: JSONLD
  url: json-ld/freqblog-com-context.jsonld
- type: Vocabulary
  url: vocabulary/freqblog-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/freqblog-com-data-model.yml
- type: ErrorCatalog
  url: errors/freqblog-com-problem-types.yml
- type: Conformance
  url: conformance/freqblog-com-conformance.yml
- type: Hosts
  url: hosts/freqblog-com-hosts.yml
- type: Vendors
  url: vendors/freqblog-com-vendors.yml
- type: Packages
  url: packages/freqblog-com-packages.yml
- type: SDKs
  url: https://freqblog.com/sdk/
- type: Authentication
  url: authentication/freqblog-com-authentication.yml
- type: DomainSecurity
  url: security/freqblog-com-domain-security.yml
- type: Website
  url: https://freqblog.com/
- type: Documentation
  url: https://api.freqblog.com/docs
- type: APIReference
  url: https://api.freqblog.com/docs
- type: GettingStarted
  url: https://freqblog.com/#pricing
- type: Support
  url: https://freqblog.com/contact.html
- type: Blog
  url: https://freqblog.com/blog/
- type: GitHubOrganization
  url: https://github.com/stevebirring-star
- type: Pricing
  url: https://freqblog.com/#pricing
- type: TermsOfService
  url: https://freqblog.com/terms.html
- type: PrivacyPolicy
  url: https://freqblog.com/privacy.html
- type: Contact
  url: https://freqblog.com/contact.html
apis:
- aid: freqblog-com:freqblog-com-audio-api
  name: freqblog-com Audio API
  description: Audio feature extraction
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Audio
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-audio-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-backfill-api
  name: freqblog-com Backfill API
  description: The Backfill API from freqblog-com — 2 operation(s) for backfill.
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Backfill
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-backfill-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-catalog-api
  name: freqblog-com Catalog API
  description: Pre-analyzed track catalog — instant name-based lookups
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-catalog-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-me-api
  name: freqblog-com Me API
  description: The Me API from freqblog-com — 1 operation(s) for me.
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Me
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-me-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-request-free-key-api
  name: freqblog-com Request Free Key API
  description: The Request Free Key API from freqblog-com — 1 operation(s) for request free key.
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Request Free Key
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-request-free-key-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-spotify-compat-api
  name: freqblog-com Spotify Compat API
  description: Spotify-shape-compatible routes for endpoints deprecated 2024-11-27. Field names and response structure match
    Spotify byte-for-byte; numeric values come from this pipeline's open-source analysis and open datasets. Values are FreqBlog's
    own, not Spotify's — re-derive any thresholds on our values. See /v1/audio-features description and the Field-by-Field
    Threshold Guide at /blog/spotify-audio-features-migration-thresholds/.
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Spotify-compat
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-spotify-compat-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-system-api
  name: freqblog-com System API
  description: Health and operational endpoints
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-system-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
- aid: freqblog-com:freqblog-com-utility-api
  name: freqblog-com Utility API
  description: The Utility API from freqblog-com — 1 operation(s) for utility.
  humanURL: https://api.freqblog.com/docs
  baseURL: https://api.freqblog.com
  tags:
  - Utility
  properties:
  - type: OpenAPI
    url: openapi/freqblog-com-utility-api-openapi.yml
  - type: JSONSchema
    url: json-schema/freqblog-com-track-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-audio-analysis-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-identify-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-recommendations-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-bulk-lookup-response-schema.json
  - type: JSONSchema
    url: json-schema/freqblog-com-embedding-response-schema.json
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 31
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

freqblog-com API — frequently asked questions

Does freqblog-com have an API?

Yes. APIs.io lists 8 APIs from freqblog-com, including freqblog-com Audio API, freqblog-com Backfill API and freqblog-com Catalog API, and 5 more.

Is there an OpenAPI specification for the freqblog-com API?

Yes. APIs.io indexes 8 OpenAPI specifications for freqblog-com, each linked for download from this page.

How do I authenticate with the freqblog-com API?

freqblog-com uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Freqblog Com Authentication.

Is the freqblog-com API ready for AI agents?

freqblog-com has a Kin Score of 52.9 out of 100 (developing) and an Agent Readiness score of 40.0 (agent-ready), scored by API Evangelist on 2026-10-31.

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