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 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

42.7/100 developing ▲ 5.6 Agent 29/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Company Finance Data Market Data

Kin Score

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

Composite quality — 42.7/100 · developing

Contract Quality 11.1 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 12.7 / 17

Operational Transparency 1.6 / 11

Contract Governance 2.2 / 10

Discoverability 4.7 / 9

Regulatory Posture 3.5 / 15

Agent readiness — 29/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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 4 / 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 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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 →
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 →
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 →

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 21.4 — up to +15.7 composite points Ask about this →
Contract Quality scores 52.4 — up to +11.9 composite points Ask about this →
Operational Transparency scores 14.3 — up to +11.1 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/marketparquet/apis.yml: open an issue on github.com/api-evangelist/marketparquet 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 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.

MarketParquet API pricing

Prices published by MarketParquet, read 2026-10-18 from marketparquet.com/pricing.

Plan	Price
FREE SAMPLE	$0
COMPLETE ARCHIVE	$79 once
KEEP CURRENT	$15/mo

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

MarketParquet Plans Pricing

3 plans

PLANS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

MarketParquet

9 quoted statements, read from MarketParquet's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

MarketParquet

16 quoted statements, read from MarketParquet's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

MarketParquet

2 quoted statements, read from MarketParquet's own page on 2026-11-10.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

MarketParquet

2 quoted statements, read from MarketParquet's own page on 2026-11-10.

LICENSE

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. Counts are the severity each rule declares, not results of running them.

MarketParquet API Rules

15 rules · 13 error-severity 1 warn-severity 1 info-severity

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 (API Evangelist recommendations) 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 6

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Company 1

The organization behind the API

Website

Website

Other 4

Properties that don't map to a standard resource type

Hosts

Vendors

DataProcessing

Eligibility

Source (apis.yml)

aid: marketparquet
name: MarketParquet
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
  probe_state: gated
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
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
- type: UsageTerms
  url: terms/marketparquet-terms-of-service.yml
- type: DataProcessing
  url: privacy/marketparquet-privacy-policy.yml
- type: Eligibility
  url: eligibility/marketparquet-eligibility.yml
- type: DataLicense
  url: data-license/marketparquet-data-license.yml
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

MarketParquet API — frequently asked questions

Does MarketParquet have an API?

Yes. APIs.io lists 1 API from MarketParquet, including MarketParquet API V1 API.

Is there an OpenAPI specification for the MarketParquet API?

Yes. APIs.io indexes 1 OpenAPI specification for MarketParquet, each linked for download from this page.

How do I authenticate with the MarketParquet API?

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

How much does the MarketParquet API cost?

MarketParquet publishes its prices; its FREE SAMPLE plan is $0 as of 2026-10-18. APIs.io lists 3 pricing plans for MarketParquet, with each plan's price, limits and inclusions under Pricing on this page.

Is the MarketParquet API ready for AI agents?

MarketParquet has a Kin Score of 42.7 out of 100 (developing) and an Agent Readiness score of 28.5 (agent-aware), scored by API Evangelist on 2026-11-13.

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