Silver Tail

Silver Tail Systems was a website fraud and abuse detection company founded in 2008 in Menlo Park, California by Mike Eynon and Laura Mather, both formerly on the anti-fraud team at eBay/PayPal. Its product collected and analyzed real-time web traffic to deliver web session intelligence and predictive analytics that detected fraud, account takeover, and abuse on banking and commerce websites. Backed by Andreessen Horowitz (a16z) among others, the company raised roughly $20M across three rounds before being acquired by RSA, the security division of EMC, in 2012 and rebranded as RSA Web Threat Detection. It no longer exists as an independent company and publishes no live developer or API surface.

Silver Tail is profiled on the APIs.io network. Tagged areas include Company, Security, Fraud Detection, Anti-Fraud, and Predictive Analytics.

🌐 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

CompanySecurityFraud DetectionAnti-FraudPredictive AnalyticsWeb Session IntelligenceAccount TakeoverFinancial ServicesAcquiredDefunct

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: silver-tail
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/silver-tail.png
name: Silver Tail
description: Silver Tail Systems was a website fraud and abuse detection company founded in 2008 in Menlo Park, California
  by Mike Eynon and Laura Mather, both formerly on the anti-fraud team at eBay/PayPal. Its product collected and analyzed
  real-time web traffic to deliver web session intelligence and predictive analytics that detected fraud, account takeover,
  and abuse on banking and commerce websites. Backed by Andreessen Horowitz (a16z) among others, the company raised roughly
  $20M across three rounds before being acquired by RSA, the security division of EMC, in 2012 and rebranded as RSA Web Threat
  Detection. It no longer exists as an independent company and publishes no live developer or API surface.
url: https://raw.githubusercontent.com/api-evangelist/silver-tail/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-reason: acquired-by-rsa-emc-2012-rebranded-rsa-web-threat-detection
x-reference: https://a16z.com/the-tale-of-silver-tail-systems/
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Security
- Fraud Detection
- Anti-Fraud
- Predictive Analytics
- Web Session Intelligence
- Account Takeover
- Financial Services
- Acquired
- Defunct
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: nochange
  artifacts_added: 0
  pass: local-v1
  note: Silver Tail Systems is defunct (acquired by RSA/EMC 2012); no live domain, website, or API surface exists to search,
    probe, or derive artifacts from.