41st Parameter

The 41st Parameter, Inc. was a device-identification and web-fraud-detection company founded in 2004 and headquartered in Silicon Valley, with offices in Arizona, the UK, and Tokyo. Its device intelligence technology reduced fraud detection false positives for use cases such as new-account fraud, card-not-present (CNP) online transaction risk scoring, and account-takeover protection. Experian acquired the company in October 2013 and folded its device-recognition technology into Experian's global web-fraud and risk-based identity-authentication portfolio (FraudNet). 41st Parameter no longer operates as a standalone entity and publishes no independent developer portal, API, or documentation. This profile was surfaced as a portfolio company of kleiner-perkins and retained in the API Evangelist network as a historical record.

41st Parameter is profiled on the APIs.io network. Tagged areas include Company, Enterprise, Fraud Detection, Device Intelligence, and Web Fraud.

🌐 Visit website 📡 Source on GitHub

6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyEnterpriseFraud DetectionDevice IntelligenceWeb FraudIdentity VerificationAccount TakeoverAcquired

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 6.8/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

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Source (apis.yml)

aid: 41st-parameter
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/41st-parameter.png
name: 41st Parameter
description: The 41st Parameter, Inc. was a device-identification and web-fraud-detection company founded in 2004 and headquartered
  in Silicon Valley, with offices in Arizona, the UK, and Tokyo. Its device intelligence technology reduced fraud detection
  false positives for use cases such as new-account fraud, card-not-present (CNP) online transaction risk scoring, and account-takeover
  protection. Experian acquired the company in October 2013 and folded its device-recognition technology into Experian's global
  web-fraud and risk-based identity-authentication portfolio (FraudNet). 41st Parameter no longer operates as a standalone
  entity and publishes no independent developer portal, API, or documentation. This profile was surfaced as a portfolio company
  of kleiner-perkins and retained in the API Evangelist network as a historical record.
url: https://raw.githubusercontent.com/api-evangelist/41st-parameter/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- kleiner-perkins
x-tier: stub
x-tier-reason: acquired-defunct
x-status: acquired
x-acquired-by: experian
x-acquired-date: '2013-10-01'
x-founded: '2004'
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Enterprise
- Fraud Detection
- Device Intelligence
- Web Fraud
- Identity Verification
- Account Takeover
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence