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SpyFu

SpyFu is a competitive SEO and PPC intelligence platform that gives marketers and agencies programmatic access to competitor keyword rankings, ad history, backlinks, and domain performance data. The REST API covers eight research domains — Domain Stats, Ad History, PPC Research, SEO Research, Competitors, Kombat, Keyword Research, and Ranking History — and is indexed against 1.6 trillion search results, 8 billion keywords, and 152 million domains.

agent ready

Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.

Kin Score

API Evangelist profiles SpyFu the way a machine reads it — 36 machine-readable artifacts across 9 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.

Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — SpyFu scores 53.4/100 (developing), with a separate agent-readiness read of 48/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.

Kin Score

This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 53.4/100 · developing
Contract Quality 15.4 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 4.8 / 13
Governance 8.8 / 12
Discoverability 10.0 / 10
Agent readiness — 48/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
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 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

How we profile SpyFu

Each block below is one kind of artifact we hold for SpyFu. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.

APIs 9

Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.

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

SpyFu Account API API

The Account API API from SpyFu — 3 operation(s) for account api.

SpyFu Ad History Research API API

The Ad History Research API API from SpyFu — 3 operation(s) for ad history research api.

SpyFu Competitors API API

The Competitors API API from SpyFu — 3 operation(s) for competitors api.

SpyFu Domain Stats API API

The Domain Stats API API from SpyFu — 6 operation(s) for domain stats api.

SpyFu Keyword Research API API

The Keyword Research API API from SpyFu — 7 operation(s) for keyword research api.

SpyFu Kombat API API

The Kombat API API from SpyFu — 2 operation(s) for kombat api.

SpyFu PPC Research API API

The PPC Research API API from SpyFu — 3 operation(s) for ppc research api.

SpyFu Ranking History API API

The Ranking History API API from SpyFu — 3 operation(s) for ranking history api.

SpyFu SEO Research API API

The SEO Research API API from SpyFu — 17 operation(s) for seo research api.

Scroll within the panel for all 9 ·

Pricing Plans 1

Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.

Published pricing tiers and plan structures.

Spyfu Plans Pricing

3 plans

PLANS

Rate Limits 1

Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.

Documented rate limits and quota policies.

Spyfu Rate Limits

8 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.

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

Spyfu Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.

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

Spyfu Context

0 classes · 23 properties

JSON-LD

Spectral Rules 1

Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.

SpyFu API Rules

5 rules · 3 warnings

SPECTRAL

JSON Schema 10

Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.

Standalone JSON Schema definitions for this provider's data models.

SpyFu Account API Schemas

0 properties

JSON SCHEMA

SpyFu Ad History API Schemas

0 properties

JSON SCHEMA

SpyFu Competitors API Schemas

0 properties

JSON SCHEMA

SpyFu Domain Stats API Schemas

0 properties

JSON SCHEMA

SpyFu Keyword API Schemas

0 properties

JSON SCHEMA

SpyFu Kombat API Schemas

0 properties

JSON SCHEMA

SpyFu PPC Research API Schemas

0 properties

JSON SCHEMA

SpyFu PPC Research API Schemas

0 properties

JSON SCHEMA

SpyFu Ranking History API Schemas

0 properties

JSON SCHEMA

SpyFu SEO Research API Schemas

0 properties

JSON SCHEMA

Scroll within the panel for all 10 ·

Examples 9

Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.

Example request and response payloads for these APIs.

Scroll within the panel for all 9 ·

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.

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

Spyfu Authentication

apiKey/http · 3 schemes

SECURITY

Spyfu Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.

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

Spyfu Agentic Access

48 operations · 1 acting

48 operations · 1 acting

AGENTIC

Resources

Every other property we hold for SpyFu — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.

Documentation 1

Reference material describing how the API behaves

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Build 1

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Operate 1

Status, limits, changes, and where to get help

Commercial 3

Pricing, plans, and the legal terms of use

Company 3

The organization behind the API

Other 1

Properties that don't map to a standard resource type

← All providers · Data indexed from github.com/api-evangelist/spyfu · machine-readable index on apis.io