Sigstr

Sigstr was an Indianapolis-based email signature marketing and account-based marketing (ABM) platform that turned employee email signatures into a targeted marketing channel, backed by Battery Ventures and other investors. It was acquired by Terminus in September 2019 and folded into the Terminus platform as its Email Experiences / signature marketing product; the standalone Sigstr brand has since been retired. As of this enrichment pass the sigstr.com domain is a parked WP Engine page (HTTP 404), no api./developer. hosts resolve, and app.sigstr.com CNAMEs to Terminus infrastructure (email2.terminusplatform.com) — the company publishes no public API surface to enrich.

Sigstr is profiled on the APIs.io network. Tagged areas include Company, Email, Email Signature, Marketing, and Account-Based Marketing.

🌐 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

CompanyEmailEmail SignatureMarketingAccount-Based MarketingMartechAcquired

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: sigstr
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/sigstr.png
name: Sigstr
description: Sigstr was an Indianapolis-based email signature marketing and account-based marketing (ABM) platform that turned
  employee email signatures into a targeted marketing channel, backed by Battery Ventures and other investors. It was acquired
  by Terminus in September 2019 and folded into the Terminus platform as its Email Experiences / signature marketing product;
  the standalone Sigstr brand has since been retired. As of this enrichment pass the sigstr.com domain is a parked WP Engine
  page (HTTP 404), no api./developer. hosts resolve, and app.sigstr.com CNAMEs to Terminus infrastructure (email2.terminusplatform.com)
  — the company publishes no public API surface to enrich.
url: https://raw.githubusercontent.com/api-evangelist/sigstr/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- battery-ventures
x-tier: stub
x-tier-reason: portfolio-lead
x-status: acquired
x-acquired-by: terminus
x-acquired-date: 2019-09
x-api-surface: none
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Email
- Email Signature
- Marketing
- Account-Based Marketing
- Martech
- Acquired
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