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 is listed with 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 📡 Profile data on GitHub

36.0/100 thin ▬ flat Agent 19/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumFree trial⚡ Free to try

1 API 2 Agent Skills

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 2026-11-06 · rubric v0.27.0

Composite quality — 36.0/100 · thin

Contract Quality 7.5 / 21

Developer Ergonomics 5.2 / 17

Access Clarity 11.2 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 6.2 / 9

Regulatory Posture 2.9 / 15

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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 35.1 — up to +16.2 composite points
Developer Ergonomics scores 30.4 — up to +13.9 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/newoldstamp/apis.yml: open an issue on github.com/api-evangelist/newoldstamp to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	builds-on	17.2 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

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...

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Roll out branded signatures to a department

AGENT SKILL

Run a signature banner marketing campaign

AGENT SKILL

Newoldstamp API pricing

Prices published by Newoldstamp.

Plan	Price
Standard	$109 Includes: Up to 200 signatures
Custom	— Includes: More than 200 signatures

Plan details, limits and sources →

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

Newoldstamp API — frequently asked questions

Does Newoldstamp have an API?

Yes. APIs.io lists 1 API from Newoldstamp, including Newoldstamp GraphQL API.

How do I authenticate with the Newoldstamp API?

Newoldstamp uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Newoldstamp Authentication.

How much does the Newoldstamp API cost?

Newoldstamp publishes its prices; its Standard plan is $109 as of 2026-08-13. APIs.io lists 2 pricing plans for Newoldstamp, with each plan's price, limits and inclusions under Pricing on this page.

Is the Newoldstamp API ready for AI agents?

Newoldstamp has a Kin Score of 36.0 out of 100 (thin) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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