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.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
41st Parameter is tracked in the API Evangelist network. This page is the human-readable profile that sits on top of the machine-readable index we maintain at apis.io.
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 — 41st Parameter scores 6.8/100 (minimal), with a separate agent-readiness read of 0/100 (human only). 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
How this is scored →scored 2026-07-27 · rubric v0.5
41st Parameter is in the network as a tracked entity. We haven't yet indexed a public API surface for it — when one is published, the artifacts, score, and agent-readiness read will appear here automatically. The source repository is where that profile is built.
← All providers · Data indexed from github.com/api-evangelist/41st-parameter · machine-readable index on apis.io