Nubela

Build and scale data-driven applications on people and companies with Nubela's Proxycurl API without worrying about scaling a web scraping and data-science team.

Nubela is listed with 4 APIs on the APIs.io network, including Company API, Competitor API, Customer API, and 1 more. Tagged areas include Companies, Data, People, and Web Scraping.

The Nubela catalog on APIs.io includes 1 Spectral governance ruleset.

Nubela’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.6/100 emerging ▬ flat Agent 23/100 agent aware Front door AI 6/6 dominant Heartbeat 90/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

4 APIs

Companies Data People Web Scraping

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Marketing Management

BC-400

Competitor

GET /competitor/listing

Kin Score

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

Composite quality — 24.6/100 · emerging

Contract Quality 9.1 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 1.1 / 17

Operational Transparency 1.3 / 11

Contract Governance 1.4 / 10

Discoverability 5.2 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 23/100 · 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 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 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 →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 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):

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Contract Quality scores 42.9 — up to +14.3 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/nubela/apis.yml: open an issue on github.com/api-evangelist/nubela 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.

Nubela Company API

The Company API from Nubela — 6 operation(s) for company.

Nubela Competitor API

The Competitor API from Nubela — 1 operation(s) for competitor.

Nubela Customer API

The Customer API from Nubela — 1 operation(s) for customer.

Nubela Employee API

The Employee API from Nubela — 3 operation(s) for employee.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Nubela Proxycurl Company API

OPEN COLLECTION

Nubela Proxycurl Company Competitor API

OPEN COLLECTION

Nubela Proxycurl Company Customer API

OPEN COLLECTION

Nubela Proxycurl Company Employee API

OPEN COLLECTION

Nubela Proxycurl API

OPEN COLLECTION

Nubela API pricing

Not yet checked against Nubela's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Nubela's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Nubela Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Nubela Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Nubela Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Nubela API Rules

38 rules · 36 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Nubela Authentication

http · 1 scheme

SECURITY

Nubela Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Nubela Agentic Access

11 operations

11 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: nubela
name: Nubela
description: Build and scale data-driven applications on people and companies with Nubela's Proxycurl API without worrying
  about scaling a web scraping and data-science team.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
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
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nubela.png
tags:
- Companies
- Data
- People
- Web Scraping
tags_raw:
- Companies
- Data
- People
- Scraping
created: '2025-02-08'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/nubela/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: nubela:nubela-company-api
  name: Nubela Company API
  description: The Company API from Nubela — 6 operation(s) for company.
  humanURL: https://nubela.co/proxycurl/
  baseURL: https://nubela.co/proxycurl/api/
  tags:
  - Company
  properties:
  - type: OpenAPI
    url: openapi/nubela-company-api-openapi.yml
  - type: Documentation
    url: https://nubela.co/proxycurl/docs
  - type: Pricing
    url: https://nubela.co/proxycurl/pricing
- aid: nubela:nubela-competitor-api
  name: Nubela Competitor API
  description: The Competitor API from Nubela — 1 operation(s) for competitor.
  humanURL: https://nubela.co/proxycurl/
  baseURL: https://nubela.co/proxycurl/api/
  tags:
  - Competitor
  properties:
  - type: OpenAPI
    url: openapi/nubela-competitor-api-openapi.yml
  - type: Documentation
    url: https://nubela.co/proxycurl/docs
  - type: Pricing
    url: https://nubela.co/proxycurl/pricing
- aid: nubela:nubela-customer-api
  name: Nubela Customer API
  description: The Customer API from Nubela — 1 operation(s) for customer.
  humanURL: https://nubela.co/proxycurl/
  baseURL: https://nubela.co/proxycurl/api/
  tags:
  - Customers
  tags_raw:
  - Customer
  properties:
  - type: OpenAPI
    url: openapi/nubela-customer-api-openapi.yml
  - type: Documentation
    url: https://nubela.co/proxycurl/docs
  - type: Pricing
    url: https://nubela.co/proxycurl/pricing
- aid: nubela:nubela-employee-api
  name: Nubela Employee API
  description: The Employee API from Nubela — 3 operation(s) for employee.
  humanURL: https://nubela.co/proxycurl/
  baseURL: https://nubela.co/proxycurl/api/
  tags:
  - Employee
  properties:
  - type: OpenAPI
    url: openapi/nubela-employee-api-openapi.yml
  - type: Documentation
    url: https://nubela.co/proxycurl/docs
  - type: Pricing
    url: https://nubela.co/proxycurl/pricing
common:
- type: Plans
  url: plans/nubela-plans-pricing.yml
- type: RateLimits
  url: rate-limits/nubela-rate-limits.yml
- type: FinOps
  url: finops/nubela-finops.yml
- type: CapabilityMap
  url: capabilities/nubela-capability-edges.yml
  name: Nubela Business Capability Map
- type: AgenticAccess
  url: agentic-access/nubela-agentic-access.yml
- type: DomainSecurity
  url: security/nubela-domain-security.yml
- type: Authentication
  url: authentication/nubela-authentication.yml
- type: GitHubOrganization
  url: https://github.com/nubela
- type: Website
  url: https://nubela.co/proxycurl/
- type: Documentation
  url: https://nubela.co/proxycurl/docs
- type: LlmsText
  url: https://nubela.co/llms.txt
- url: https://nubela.co/blog/feed
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Nubela API — frequently asked questions

Does Nubela have an API?

Yes. APIs.io lists 4 APIs from Nubela, including Nubela Company API, Nubela Competitor API and Nubela Customer API, and 1 more.

Is there an OpenAPI specification for the Nubela API?

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

How do I authenticate with the Nubela API?

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

How much does the Nubela API cost?

APIs.io lists 3 pricing plans for Nubela, with each plan's price, limits and inclusions under Pricing on this page.

Is the Nubela API ready for AI agents?

Nubela has a Kin Score of 24.6 out of 100 (emerging) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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