MarketParquet

MarketParquet provides historical US stock, ETF, and futures market data in columnar Parquet format. It offers split‑adjusted OHLCV bars from 2000 to present, including delisted tickers, with free daily samples and a paid complete archive. The service targets quantitative analysts, backtesters, and data scientists needing high‑performance, ready‑to‑load datasets for pandas, Polars, or DuckDB.

MarketParquet publishes 1 API contract indexed on the APIs.io network: API V1 API. Tagged areas include Company, Finance, Data, and Market Data.

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

MarketParquet’s developer surface includes changelog, authentication, documentation, pricing, signup flow, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

43.4/100 developing Agent 25/100 agent aware Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 published contract

Company Finance Data Market Data

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 43.4/100 · developing

Contract Quality 11.1 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 13.0 / 17

Operational Transparency 1.7 / 11

Contract Governance 2.2 / 10

Discoverability 4.1 / 9

Regulatory Posture 4.3 / 15

Agent readiness — 25/100 · agent aware

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 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

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data 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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<a href="https://apis.io/providers/marketparquet/"><img src="https://apis.io/badge/marketparquet/card.svg" alt="MarketParquet on APIs.io — Kin Score by API Evangelist"></a>

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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 github.com/api-evangelist/marketparquet: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

MarketParquet API V1 API

The api-v1 API from MarketParquet — 4 operation(s) for api-v1.

Pricing Plans 1

Published pricing tiers and plan structures.

Marketparquet Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

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

Marketparquet Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

MarketParquet API Rules

15 rules · 13 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Marketparquet Openapi Overlay

0 actions · update

UNRECORDED

Security Posture 2

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

Marketparquet Authentication

http · 1 scheme

SECURITY

Marketparquet Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Marketparquet Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

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 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

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: marketparquet
name: MarketParquet
image: https://marketparquet.com/static/og-image.png
description: MarketParquet provides historical US stock, ETF, and futures market data in columnar Parquet format. It offers
  split‑adjusted OHLCV bars from 2000 to present, including delisted tickers, with free daily samples and a paid complete
  archive. The service targets quantitative analysts, backtesters, and data scientists needing high‑performance, ready‑to‑load
  datasets for pandas, Polars, or DuckDB.
url: https://raw.githubusercontent.com/api-evangelist/marketparquet/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-18 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-18'
modified: '2026-10-18'
tags:
- Company
- Finance
- Data
- Market Data
tags_raw:
- Company
- Finance
- Data
- MarketData
- APIs
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/marketparquet-agentic-access.yml
- type: Plans
  url: plans/marketparquet-plans-pricing.yml
- type: Spectral
  url: rules/marketparquet-rules.yml
- type: JSONLD
  url: json-ld/marketparquet-context.jsonld
- type: Vocabulary
  url: vocabulary/marketparquet-vocabulary.yml
- type: DataModel
  url: data-model/marketparquet-data-model.yml
- type: ChangeLog
  url: changelog/marketparquet-changelog.yml
- type: ErrorCatalog
  url: errors/marketparquet-problem-types.yml
- type: Conformance
  url: conformance/marketparquet-conformance.yml
- type: LLMsTxt
  url: llms/marketparquet-llms.txt
- type: Hosts
  url: hosts/marketparquet-hosts.yml
- type: Vendors
  url: vendors/marketparquet-vendors.yml
- type: Authentication
  url: authentication/marketparquet-authentication.yml
- type: DomainSecurity
  url: security/marketparquet-domain-security.yml
- type: Website
  url: https://marketparquet.com/
- type: Documentation
  url: https://marketparquet.com/documentation
- type: Pricing
  url: https://marketparquet.com/pricing
- type: Login
  url: https://marketparquet.com/auth/login
- type: SignUp
  url: https://marketparquet.com/auth/register
- type: TermsOfService
  url: https://marketparquet.com/terms
- type: PrivacyPolicy
  url: https://marketparquet.com/privacy
- type: ChangeLog
  url: https://marketparquet.com/changelog
apis:
- aid: marketparquet:marketparquet-api-v1-api
  name: MarketParquet API V1 API
  description: The api-v1 API from MarketParquet — 4 operation(s) for api-v1.
  humanURL: https://marketparquet.com/documentation
  tags:
  - ApiV1
  tags_raw:
  - api-v1
  properties:
  - type: OpenAPI
    url: openapi/marketparquet-api-v1-api-openapi.yml
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-18'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://marketparquet.com/mcp
    status: 401
  - url: https://marketparquet.com/
    status: 200
x-enrichment:
  date: '2026-10-18'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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