Quiver Quantitative

Quiver Quantitative provides comprehensive political and financial data APIs, delivering real‑time and historical datasets on congressional trading, insider transactions, lobbying, government contracts, election fundraising, and market‑moving events. Users can query datasets on politicians, stocks, bills, and economic indicators, with subscription plans for analysts, journalists, and fintech developers.

Quiver Quantitative publishes 4 API contracts indexed on the APIs.io network, including Beta API, Tier 1 API, Tier 2 API, and 1 more. Tagged areas include Company, Data, Finance, Politics, and Alternative Data.

The Quiver Quantitative catalog on APIs.io includes 1 Spectral governance ruleset.

Quiver Quantitative’s developer surface includes authentication, documentation, API reference, engineering blog, pricing, signup flow, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.4/100 thin ▼ -5.9 Agent 19/100 agent aware Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 Agent Skills

Company Data Finance Politics Alternative Data Financial Data Investment Research Market Data Government DataCongressional Trading

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 30.4/100 · thin

Contract Quality 8.5 / 19

Developer Ergonomics 4.4 / 15

Access Clarity 3.4 / 15

Operational Transparency 0.0 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 2.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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 0 / 8

Request/Response Examples 0 / 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 0 / 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 22.4 — up to +15.5 composite points
Developer Ergonomics scores 29.2 — up to +14.2 composite points
Contract Quality scores 45.3 — up to +13.7 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/quiver-quantitative/apis.yml: open an issue on github.com/api-evangelist/quiver-quantitative 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 4

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

Quiver Quantitative Beta API

The Beta API from Quiver Quantitative — 2 operation(s) for beta.

Quiver Quantitative Tier 1 API

tier 1 endpoint

Quiver Quantitative Tier 2 API

tier 2 endpoint

Quiver Quantitative Tier New Constructs Ratings API

The Tier New Constructs Ratings API from Quiver Quantitative — 1 operation(s) for tier new constructs ratings.

Agent Skills 1

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

quiver-quantitative-login-logout

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Quiver Quantitative API Rules

58 rules · 47 errors 10 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.

Quiver Quantitative Openapi Overlay

0 actions · update

DERIVED

Security Posture 2

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

Quiver Quantitative Authentication

http · 1 scheme

SECURITY

Quiver Quantitative Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Quiver Quantitative Agentic Access

53 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

DataModel

DataModel

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: quiver-quantitative
name: Quiver Quantitative
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.quiverquant.com/static/images/site_preview.png
description: Quiver Quantitative provides comprehensive political and financial data APIs, delivering real‑time and historical
  datasets on congressional trading, insider transactions, lobbying, government contracts, election fundraising, and market‑moving
  events. Users can query datasets on politicians, stocks, bills, and economic indicators, with subscription plans for analysts,
  journalists, and fintech developers.
url: https://raw.githubusercontent.com/api-evangelist/quiver-quantitative/refs/heads/main/apis.yml
x-type: company
x-source: harvest:market-data
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-21 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-21'
modified: '2026-09-21'
tags:
- Company
- Data
- Finance
- Politics
- Alternative Data
- Financial Data
- Investment Research
- Market Data
- Government Data
- Congressional Trading
tags_raw:
- Company
- Data
- Finance
- Politics
- API
- Alternative Data
- Financial Data
- Investment Research
- Market Data
- Government Data
- Congressional Trading
apis:
- aid: quiver-quantitative:quiver-quantitative-beta-api
  name: Quiver Quantitative Beta API
  description: The Beta API from Quiver Quantitative — 2 operation(s) for beta.
  humanURL: https://api.quiverquant.com/docs/
  baseURL: https://api.quiverquant.com
  tags:
  - Beta
  properties:
  - type: OpenAPI
    url: openapi/quiver-quantitative-beta-api-openapi.yml
- aid: quiver-quantitative:quiver-quantitative-tier-1-api
  name: Quiver Quantitative Tier 1 API
  description: tier 1 endpoint
  humanURL: https://api.quiverquant.com/docs/
  baseURL: https://api.quiverquant.com
  tags:
  - Tier 1
  properties:
  - type: OpenAPI
    url: openapi/quiver-quantitative-tier-1-api-openapi.yml
- aid: quiver-quantitative:quiver-quantitative-tier-2-api
  name: Quiver Quantitative Tier 2 API
  description: tier 2 endpoint
  humanURL: https://api.quiverquant.com/docs/
  baseURL: https://api.quiverquant.com
  tags:
  - Tier 2
  properties:
  - type: OpenAPI
    url: openapi/quiver-quantitative-tier-2-api-openapi.yml
- aid: quiver-quantitative:quiver-quantitative-tier-new-constructs-ratings-api
  name: Quiver Quantitative Tier New Constructs Ratings API
  description: The Tier New Constructs Ratings API from Quiver Quantitative — 1 operation(s) for tier new constructs ratings.
  humanURL: https://api.quiverquant.com/docs/
  baseURL: https://api.quiverquant.com
  tags:
  - Tier New Constructs Ratings
  properties:
  - type: OpenAPI
    url: openapi/quiver-quantitative-tier-new-constructs-ratings-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: TermsOfService
  url: https://www.quiverquant.com/termsofservice/
- type: PrivacyPolicy
  url: https://www.quiverquant.com/privacypolicy/
- type: AgenticAccess
  url: agentic-access/quiver-quantitative-agentic-access.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/quiver-quantitative-data-model.yml
- type: Conformance
  url: conformance/quiver-quantitative-conformance.yml
- type: Overlay
  url: overlays/quiver-quantitative-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/quiver-quantitative-llms.txt
- type: Newsroom
  url: https://www.quiverquant.com/news/
- type: Authentication
  url: authentication/quiver-quantitative-authentication.yml
- type: DomainSecurity
  url: security/quiver-quantitative-domain-security.yml
- type: Website
  url: https://www.quiverquant.com/
- type: Documentation
  url: https://www.quiverquant.com/api/
- type: APIReference
  url: https://www.quiverquant.com/api/
- type: Blog
  url: https://www.quiverquant.com/blog/
- type: Pricing
  url: https://www.quiverquant.com/register/?next=pricing
- type: SignUp
  url: https://www.quiverquant.com/register/
- type: Documentation
  url: https://api.quiverquant.com/docs/
x-enrichment:
  date: '2026-09-21'
  status: enriched
  artifacts_added: 14
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local

Quiver Quantitative API — frequently asked questions

Does Quiver Quantitative have an API?

Yes. APIs.io lists 4 APIs from Quiver Quantitative, including Quiver Quantitative Beta API, Quiver Quantitative Tier 1 API and Quiver Quantitative Tier 2 API, and 1 more.

Is there an OpenAPI specification for the Quiver Quantitative API?

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

How do I authenticate with the Quiver Quantitative API?

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

Is the Quiver Quantitative API ready for AI agents?

Quiver Quantitative has a Kin Score of 30.4 out of 100 (thin) and an Agent Readiness score of 19.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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