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 APIs on the APIs.io network, including Beta API, Tier 1 API, Tier 2 API, and 1 more. Tagged areas include Company, Data, Finance, and Politics.

Quiver Quantitative’s developer surface includes authentication, documentation, API reference, engineering blog, pricing, signup flow, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.3/100 thin Agent 18/100 agent aware Full breakdown ↓
scored 2026-09-21 · rubric v0.22.0
2 APIs
CompanyDataFinancePolitics

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-21 · rubric v0.22.0
Composite quality — 35.3/100 · thin
Contract Quality 11.9 / 23
Developer Ergonomics 5.9 / 18
Access Clarity 8.0 / 18
Operational Transparency 0.0 / 12
Contract Governance 0.5 / 11
Discoverability 6.0 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 18/100 · 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
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.
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/quiver-quantitative: 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 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.

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

53 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

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)

apis.yml Raw ↑ 
aid: quiver-quantitative
name: Quiver Quantitative
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
tags_raw:
- Company
- Data
- Finance
- Politics
- API
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/
x-enrichment:
  date: '2026-09-21'
  status: enriched
  artifacts_added: 14
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local

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