Newoldstamp

Newoldstamp is an email signature management platform that lets companies create, brand, and centrally manage professional email signatures across their teams. It provides a signature generator with customizable templates, department- and role-based signature deployment, email signature marketing banners and campaigns, click analytics, and integrations with Google Workspace, Microsoft 365, and popular email clients. Newoldstamp also operates Pearl Diver, a website-visitor identification product. Founded in 2016 and a wholly-owned subsidiary of Blackpearl Group since 2025 (previously backed by 500 Global), it serves marketing, sales, and IT teams that want consistent branded email signatures at scale. Newoldstamp publishes no documented public developer program, but its dashboard is powered by a GraphQL API at newoldstamp.com/api/graphql (41 queries, 71 mutations, 4 subscriptions) whose introspection is anonymously open.

Newoldstamp publishes 1 API on the APIs.io network. Tagged areas include Company, Email Signatures, Email Signature Management, Email Marketing, and Branding.

Newoldstamp’s developer surface includes documentation, pricing, engineering blog, support, signup flow, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

36.1/100 thin ▬ flat Agent 19/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumFree trial⚡ Free to try

1 APIs

CompanyEmail SignaturesEmail Signature Management Email Marketing Branding Software-as-a-Service Productivity Website Visitor Identification GraphQL

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 36.1/100 · thin

Contract Quality 9.3 / 25

Developer Ergonomics 6.1 / 20

Access Clarity 13.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 7.6 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/newoldstamp: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Newoldstamp GraphQL API

The undocumented application GraphQL API that powers the Newoldstamp dashboard — signatures, departments, campaigns, segments, Google Workspace and Microsoft 365 deployment, and...

Pricing Plans 1

Published pricing tiers and plan structures.

Newoldstamp Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Newoldstamp Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Newoldstamp Authentication

http · 1 scheme

SECURITY

Newoldstamp Domain Security

TLSv1.3

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: newoldstamp
name: Newoldstamp
description: Newoldstamp is an email signature management platform that lets companies create, brand, and centrally manage
  professional email signatures across their teams. It provides a signature generator with customizable templates, department-
  and role-based signature deployment, email signature marketing banners and campaigns, click analytics, and integrations
  with Google Workspace, Microsoft 365, and popular email clients. Newoldstamp also operates Pearl Diver, a website-visitor
  identification product. Founded in 2016 and a wholly-owned subsidiary of Blackpearl Group since 2025 (previously backed
  by 500 Global), it serves marketing, sales, and IT teams that want consistent branded email signatures at scale. Newoldstamp
  publishes no documented public developer program, but its dashboard is powered by a GraphQL API at newoldstamp.com/api/graphql
  (41 queries, 71 mutations, 4 subscriptions) whose introspection is anonymously open.
url: https://raw.githubusercontent.com/api-evangelist/newoldstamp/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-service
  trial: true
  try_now: true
  public: false
  label: Self-service
  confidence: medium
  source:
  - https://newoldstamp.com/pricing/
  generated: '2026-08-13'
  method: searched
image: https://newoldstamp.com/images/logo-v4.svg
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-acquired-by: blackpearl-group
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- Company
- Email Signatures
- Email Signature Management
- Email Marketing
- Branding
- Software-as-a-Service
- Productivity
- Website Visitor Identification
- GraphQL
tags_raw:
- Company
- Email Signatures
- Email Signature Management
- Email Marketing
- Branding
- SaaS
- Productivity
- Website Visitor Identification
- GraphQL
apis:
- name: Newoldstamp GraphQL API
  description: The undocumented application GraphQL API that powers the Newoldstamp dashboard — signatures, departments, campaigns,
    segments, Google Workspace and Microsoft 365 deployment, and billing. Introspection is anonymously open; auth is a bearer
    access token from the signIn mutation. No public developer program.
  humanURL: https://newoldstamp.com/features/
  baseURL: https://newoldstamp.com/api/graphql
  properties:
  - type: GraphQL
    url: graphql/newoldstamp.graphql
  - type: Authentication
    url: authentication/newoldstamp-authentication.yml
  - type: Conventions
    url: conventions/newoldstamp-conventions.yml
  - type: DataModel
    url: data-model/newoldstamp-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/newoldstamp-domain-security.yml
- type: LLMsTxt
  url: llms/newoldstamp-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Plans
  url: plans/newoldstamp-plans-pricing.yml
- type: RateLimits
  url: rate-limits/newoldstamp-rate-limits.yml
- type: Website
  url: https://newoldstamp.com
- type: Documentation
  url: https://support.newoldstamp.com/en/
- type: Pricing
  url: https://newoldstamp.com/pricing/
- type: Blog
  url: https://newoldstamp.com/blog/
- type: Support
  url: https://support.newoldstamp.com/en/
- type: SignUp
  url: https://app.newoldstamp.com/sign-up
- type: Login
  url: https://app.newoldstamp.com/sign-in
- type: TermsOfService
  url: https://newoldstamp.com/terms-of-use/
- type: PrivacyPolicy
  url: https://newoldstamp.com/privacy/
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 11
  pass: local-v1

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