flatmark

Flatmark provides a REST API and MCP server that converts PDF, Word, PowerPoint, Excel, and HTML documents into Markdown format, enabling efficient retrieval-augmented generation (RAG) and agent workflows. Hosted in Germany, the service offers a free tier and paid plans (Essential and Scale) with transparent pricing. The platform emphasizes developer-friendly tooling, clear documentation, and open-source SDKs for easy integration into applications.

flatmark publishes 4 API contracts indexed on the APIs.io network, including Account API, Convert API, Jobs API, and 1 more. Tagged areas include PDF, Markdown, Conversion, and RAG.

The flatmark catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

flatmark’s developer surface includes support, authentication, documentation, pricing, signup flow, getting-started guide, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

47.7/100 developing Agent 38/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 Agent Skills

PDF Markdown Conversion RAG

Kin Score

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

Composite quality — 47.7/100 · developing

Contract Quality 14.9 / 21

Developer Ergonomics 6.8 / 17

Access Clarity 10.5 / 17

Operational Transparency 0.8 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 38/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 6 / 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 5 / 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 →
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 →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →

5 more unmet checks in the Agent Readiness table above.

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

Operational Transparency scores 7.1 — up to +12.1 composite points Ask about this →
Developer Ergonomics scores 39.9 — up to +12.0 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 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/flatmark-dev/apis.yml: open an issue on github.com/api-evangelist/flatmark-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 →

Standards implemented 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

flatmark Account API

Check your plan, your remaining requests and credits, and what your plan includes. `GET /v1/me` is always free.

flatmark Convert API

The Convert API from flatmark — 3 operation(s) for convert.

flatmark Jobs API

Track work submitted to the queue. Poll one job by id, or list your recent jobs. The submitting call returns the job id and its poll URL. Polling and listing are free.

flatmark Webhooks API

Get events POSTed to your own https endpoint, signed per [Standard Webhooks](https://www.standardwebhooks.com/): verify the `webhook-signature` header with the endpoint's secret...

Agent Skills 1

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

convert-document

AGENT SKILL

flatmark API pricing

Prices published by flatmark, read 2026-11-08 from flatmark.dev/pricing.

Plan	Price
Free	€0 a month
Essential	€20 a month
Scale	€80 a month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

flatmark Plans Pricing

3 plans

PLANS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Flatmark Dev Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Flatmark Dev Context

15 classes · 44 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.

flatmark API Rules

58 rules · 52 error-severity 4 warn-severity 2 info-severity

SPECTRAL

JSON Schema 6

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

Body_submit_conversion_job

2 properties

JSON SCHEMA

JobResponse

8 properties

JSON SCHEMA

JobSubmitResponse

5 properties

JSON SCHEMA

MeResponse

5 properties

JSON SCHEMA

WebhookEndpointCreated

8 properties

JSON SCHEMA

WebhookEndpointRequest

3 properties

JSON SCHEMA

Security Posture 2

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

flatmark Authentication

apiKey · 1 scheme

SECURITY

flatmark Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

flatmark Agentic Access

10 operations · 5 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

ErrorCatalog

Conformance

Scroll for all 7

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: flatmark-dev
name: flatmark
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://flatmark.dev/app-static/brand/og.png
description: Flatmark provides a REST API and MCP server that converts PDF, Word, PowerPoint, Excel, and HTML documents into
  Markdown format, enabling efficient retrieval-augmented generation (RAG) and agent workflows. Hosted in Germany, the service
  offers a free tier and paid plans (Essential and Scale) with transparent pricing. The platform emphasizes developer-friendly
  tooling, clear documentation, and open-source SDKs for easy integration into applications.
url: https://artifacts.apis.io/flatmark-dev/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:
- PDF
- Markdown
- Conversion
- RAG
tags_raw:
- PDF
- Markdown
- Conversion
- API
- RAG
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/flatmark-dev-agentic-access.yml
- type: Plans
  url: plans/flatmark-dev-plans-pricing.yml
- type: Spectral
  url: rules/flatmark-dev-rules.yml
- type: JSONLD
  url: json-ld/flatmark-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/flatmark-dev-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/flatmark-dev-webhooks.yml
- type: DataModel
  url: data-model/flatmark-dev-data-model.yml
- type: ErrorCatalog
  url: errors/flatmark-dev-problem-types.yml
- type: Conformance
  url: conformance/flatmark-dev-conformance.yml
- type: LLMsTxt
  url: llms/flatmark-dev-llms.txt
- type: WellKnown
  url: well-known/flatmark-dev-well-known.yml
- type: Hosts
  url: hosts/flatmark-dev-hosts.yml
- type: TermsOfService
  url: https://flatmark.dev/terms
- type: Support
  url: https://flatmark.dev/support
- type: PrivacyPolicy
  url: https://flatmark.dev/privacy
- type: Authentication
  url: authentication/flatmark-dev-authentication.yml
- type: DomainSecurity
  url: security/flatmark-dev-domain-security.yml
- type: Website
  url: https://flatmark.dev/
- type: Documentation
  url: https://flatmark.dev/docs
- type: Pricing
  url: https://flatmark.dev/pricing
- type: SignUp
  url: https://flatmark.dev/auth/register
- type: Login
  url: https://flatmark.dev/auth/login
- type: GettingStarted
  url: https://flatmark.dev/connect
apis:
- aid: flatmark-dev:flatmark-dev-account-api
  name: flatmark Account API
  description: Check your plan, your remaining requests and credits, and what your plan includes. `GET /v1/me` is always free.
  humanURL: https://flatmark.dev/docs
  baseURL: https://api.flatmark.dev
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/flatmark-dev-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flatmark-dev-me-response-schema.json
- aid: flatmark-dev:flatmark-dev-convert-api
  name: flatmark Convert API
  description: The Convert API from flatmark — 3 operation(s) for convert.
  humanURL: https://flatmark.dev/docs
  baseURL: https://api.flatmark.dev
  tags:
  - Convert
  properties:
  - type: OpenAPI
    url: openapi/flatmark-dev-convert-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flatmark-dev-job-submit-response-schema.json
  - type: JSONSchema
    url: json-schema/flatmark-dev-body-submit-conversion-job-schema.json
- aid: flatmark-dev:flatmark-dev-jobs-api
  name: flatmark Jobs API
  description: Track work submitted to the queue. Poll one job by id, or list your recent jobs. The submitting call returns
    the job id and its poll URL. Polling and listing are free.
  humanURL: https://flatmark.dev/docs
  baseURL: https://api.flatmark.dev
  tags:
  - Job
  tags_raw:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/flatmark-dev-jobs-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flatmark-dev-job-response-schema.json
- aid: flatmark-dev:flatmark-dev-webhooks-api
  name: flatmark Webhooks API
  description: 'Get events POSTed to your own https endpoint, signed per [Standard Webhooks](https://www.standardwebhooks.com/):
    verify the `webhook-signature` header with the endpoint''s secret, and use `webhook-id` to drop duplicates. A failed delivery
    is retried for a little over a day.'
  humanURL: https://flatmark.dev/docs
  baseURL: https://api.flatmark.dev
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/flatmark-dev-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flatmark-dev-webhook-endpoint-created-schema.json
  - type: JSONSchema
    url: json-schema/flatmark-dev-webhook-endpoint-request-schema.json
x-enrichment:
  date: '2026-11-08'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

flatmark API — frequently asked questions

Does flatmark have an API?

Yes. APIs.io lists 4 APIs from flatmark, including flatmark Account API, flatmark Convert API and flatmark Jobs API, and 1 more.

Is there an OpenAPI specification for the flatmark API?

Yes. APIs.io indexes 4 OpenAPI specifications for flatmark, each linked for download from this page.

How do I authenticate with the flatmark API?

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

How much does the flatmark API cost?

flatmark publishes its prices; its Free plan is €0 a month as of 2026-11-08. APIs.io lists 3 pricing plans for flatmark, with each plan's price, limits and inclusions under Pricing on this page.

Is the flatmark API ready for AI agents?

flatmark has a Kin Score of 47.7 out of 100 (developing) and an Agent Readiness score of 37.9 (agent-ready), scored by API Evangelist on 2026-11-13.

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