classifier-dev

classifier.dev provides a zero‑shot text classification API over plain HTTP. Users can submit raw text, URLs, or structured questions and receive classification labels without any API key, account, or authentication. The service offers a free tier with per‑IP limits and paid plans for higher usage, workspace keys, and billing. An OpenAPI 3.1 description is available at /openapi.json and a short index at /llms.txt. Documentation and developer resources are at /developers, pricing at /pricing, terms at /terms, and privacy at /privacy. The platform supports data‑sharing opt‑out via request parameters or headers. Hosted at classifier.dev with source linked to a GitHub organization.

classifier-dev publishes 6 API contracts indexed on the APIs.io network, including Account API, Classifier.dev API, Classify API, and 3 more. Tagged areas include Company, Machine Learning, NLP, Classification, and API.

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

classifier-dev’s developer surface includes CLI, authentication, getting-started guide, documentation, API reference, pricing, and 30 more developer resources.

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64.6/100 strong Agent 61/100 agent native Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

Company Machine LearningNLPClassificationAPIOpenAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 64.6/100 · strong

Contract Quality 14.1 / 21

Developer Ergonomics 12.0 / 17

Access Clarity 13.0 / 17

Operational Transparency 5.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 5.6 / 15

Agent readiness — 61/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

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
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter

1 more unmet check in the Agent Readiness table above.

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

Contract Governance scores 22.0 — up to +9.4 composite points
Contract Quality scores 66.4 — up to +8.4 composite points
Operational Transparency scores 47.4 — up to +6.8 composite points

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/classifier-dev/apis.yml: open an issue on github.com/api-evangelist/classifier-dev 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Typed Decision Models	undeclared	-	2	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 6

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

classifier-dev Account API

Workspace balance and usage; requires a workspace API key and enabled account access.

classifier-dev Classifier.dev API

The Classifier.dev API from classifier-dev — 2 operation(s) for classifier.dev.

classifier-dev Classify API

Sort texts into labels, with a calibrated confidence.

classifier-dev Docs API

Documentation served over HTTP.

classifier-dev Feedback API

Structured feedback from agents (feedback.now protocol): submit, then poll a receipt.

classifier-dev Subscribe API

The Subscribe API from classifier-dev — 2 operation(s) for subscribe.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

classifier-dev MCP Server

Remote MCP server at classifier.dev.

MCP SERVER

Agent Skills 1

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

classifier-dev-classify

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Classifier Dev Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Classifier Dev Rate Limits

6 limits

RATE LIMITS

Semantic Vocabularies 1

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

Classifier Dev Context

22 classes · 122 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

classifier-dev API Rules

17 rules · 11 errors 3 warnings 3 info

SPECTRAL

JSON Schema 6

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

ClassifyRequest

14 properties

JSON SCHEMA

ClassifyResponse

7 properties

JSON SCHEMA

FeedbackReport

5 properties

JSON SCHEMA

SingleResult

12 properties

JSON SCHEMA

TypeSafeSystemOneRequest

6 properties

JSON SCHEMA

TypeSafeSystemOneResponse

3 properties

JSON SCHEMA

Security Posture 3

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

Classifier Dev Authentication

2 schemes

SECURITY

Classifier Dev Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Classifier Dev Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Classifier Dev Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Classifier Dev Agentic Access

30 operations · 15 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 5

SDKs, sample code, and the tooling you integrate with

CLI

ToolCrosswalk

SDKs

Packages

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Security

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: classifier-dev
name: classifier-dev
description: classifier.dev provides a zero‑shot text classification API over plain HTTP. Users can submit raw text, URLs,
  or structured questions and receive classification labels without any API key, account, or authentication. The service offers
  a free tier with per‑IP limits and paid plans for higher usage, workspace keys, and billing. An OpenAPI 3.1 description
  is available at /openapi.json and a short index at /llms.txt. Documentation and developer resources are at /developers,
  pricing at /pricing, terms at /terms, and privacy at /privacy. The platform supports data‑sharing opt‑out via request parameters
  or headers. Hosted at classifier.dev with source linked to a GitHub organization.
url: https://artifacts.apis.io/classifier-dev/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- Company
- Machine Learning
- NLP
- Classification
- API
- OpenAPI
image: https://classifier.dev/favicon.ico
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/classifier-dev-agentic-access.yml
- type: RateLimits
  url: rate-limits/classifier-dev-rate-limits.yml
- type: Plans
  url: plans/classifier-dev-plans-pricing.yml
- type: Spectral
  url: rules/classifier-dev-rules.yml
- type: JSONLD
  url: json-ld/classifier-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/classifier-dev-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/classifier-dev-data-model.yml
- type: CLI
  url: cli/classifier-dev-cli.yml
- type: Security
  url: security/classifier-dev-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/classifier-dev-authentication.yml
- type: ErrorCatalog
  url: errors/classifier-dev-problem-types.yml
- type: Conformance
  url: conformance/classifier-dev-conformance.yml
- type: LLMsTxt
  url: llms/classifier-dev-llms.txt
- type: AgentCard
  url: a2a/classifier-dev-a2a.yml
- type: ToolCrosswalk
  url: mcp/classifier-dev-tool-crosswalk.yml
- type: MCPServer
  url: mcp/classifier-dev-mcp.yml
- type: SecurityTxt
  url: well-known/classifier-dev-security.txt
- type: SecurityTxt
  url: well-known/classifier-dev-cal-security.txt
- type: WellKnown
  url: well-known/classifier-dev-well-known.yml
- type: Hosts
  url: hosts/classifier-dev-hosts.yml
- type: Vendors
  url: vendors/classifier-dev-vendors.yml
- type: SDKs
  url: packages/classifier-dev-packages.yml
- type: Packages
  url: packages/classifier-dev-packages.yml
- type: Login
  url: https://classifier.dev/login
- type: GettingStarted
  url: https://classifier.dev/mcp-setup
- type: VulnerabilityDisclosure
  url: security/classifier-dev-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/classifier-dev-domain-security.yml
- type: Website
  url: https://classifier.dev/
- type: DeveloperPortal
  url: https://classifier.dev/developers
- type: Documentation
  url: https://classifier.dev/developers
- type: APIReference
  url: https://classifier.dev/openapi.json
- type: Pricing
  url: https://classifier.dev/pricing
- type: TermsOfService
  url: https://classifier.dev/terms
- type: PrivacyPolicy
  url: https://classifier.dev/privacy
- type: GitHubOrganization
  url: https://github.com/mrmps
apis:
- aid: classifier-dev:classifier-dev-account-api
  name: classifier-dev Account API
  description: Workspace balance and usage; requires a workspace API key and enabled account access.
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - account
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
- aid: classifier-dev:classifier-dev-classifier-dev-api
  name: classifier-dev Classifier.dev API
  description: The Classifier.dev API from classifier-dev — 2 operation(s) for classifier.dev.
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - Classifier.dev
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-classifier-dev-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
- aid: classifier-dev:classifier-dev-classify-api
  name: classifier-dev Classify API
  description: Sort texts into labels, with a calibrated confidence.
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - classify
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-classify-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
- aid: classifier-dev:classifier-dev-docs-api
  name: classifier-dev Docs API
  description: Documentation served over HTTP.
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - docs
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-docs-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
- aid: classifier-dev:classifier-dev-feedback-api
  name: classifier-dev Feedback API
  description: 'Structured feedback from agents (feedback.now protocol): submit, then poll a receipt.'
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - feedback
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-feedback-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
- aid: classifier-dev:classifier-dev-subscribe-api
  name: classifier-dev Subscribe API
  description: The Subscribe API from classifier-dev — 2 operation(s) for subscribe.
  humanURL: https://classifier.dev/developers
  baseURL: https://classifier.dev
  tags:
  - Subscribe
  properties:
  - type: OpenAPI
    url: openapi/classifier-dev-subscribe-api-openapi.yml
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-feedback-report-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-request-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-classify-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-type-safe-system-one-response-schema.json
  - type: JSONSchema
    url: json-schema/classifier-dev-single-result-schema.json
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 45
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

classifier-dev API — frequently asked questions

Does classifier-dev have an API?

Yes. APIs.io lists 6 APIs from classifier-dev, including classifier-dev Account API, classifier-dev Classifier.dev API and classifier-dev Classify API, and 3 more.

Is there an OpenAPI specification for the classifier-dev API?

Yes. APIs.io indexes 6 OpenAPI specifications for classifier-dev, each linked for download from this page.

How do I authenticate with the classifier-dev API?

classifier-dev documents its authentication (2 schemes). The details are profiled on APIs.io as Classifier Dev Authentication.

How much does the classifier-dev API cost?

APIs.io lists 5 pricing plans for classifier-dev, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does classifier-dev have an MCP server?

Yes. APIs.io lists 1 MCP server for classifier-dev: Remote MCP server at classifier.dev.

Is the classifier-dev API ready for AI agents?

classifier-dev has a Kin Score of 64.6 out of 100 (strong) and an Agent Readiness score of 61.1 (agent-native), scored by API Evangelist on 2026-10-31.

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