Twain

Twain provides an AI‑powered outreach platform that helps sales and marketing teams craft highly personalized cold‑email campaigns at scale. By combining contextual research with natural‑language generation, Twain creates unique, human‑like messages for each prospect, boosting reply rates and reducing campaign preparation time. The service includes features such as automated prospect research, email drafting, A/B testing, and performance analytics, aiming to improve outbound outreach efficiency and effectiveness for B2B companies.

Twain is profiled on the APIs.io network. Tagged areas include Company, AI, Outreach, Sales, and Marketing.

Twain’s developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 16 more developer resources.

🌐 Visit website📡 Profile data on GitHub
37.0/100 thin Agent 19/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
0 APIs
CompanyAIOutreachSalesMarketing

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 37.0/100 · thin
Contract Quality 0.0 / 21
Developer Ergonomics 9.7 / 17
Access Clarity 13.0 / 17
Operational Transparency 1.2 / 11
Contract Governance 1.9 / 10
Discoverability 4.1 / 9
Regulatory Posture 4.2 / 15
Agent readiness — 19/100 · agent aware
Machine-Readable Contract 0 / 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 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 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 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 5 / 5
Distinct Operations 3 / 3
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):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
9 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/twain/apis.yml: open an issue on github.com/api-evangelist/twain 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 →

Pricing Plans 1

Published pricing tiers and plan structures.

Twain Plans Pricing

7 plans

PLANS

Security Posture 3

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

Twain Authentication

1 scheme

SECURITY

Twain Domain Security

TLSv1.3 · HSTS

SECURITY

Twain Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance

Access & Security 7

Authentication, authorization, and security posture

Security
Security
 Authentication
Authentication
 SecurityTxt
SecurityTxt
 SecurityTxt
SecurityTxt
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Scroll for all 7

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Hosts
Hosts

Source (apis.yml)

apis.yml Raw ↑ 
aid: twain
name: Twain
image: https://www.twain.ai/opengraph/default.png?v=20260724
description: Twain provides an AI‑powered outreach platform that helps sales and marketing teams craft highly personalized
  cold‑email campaigns at scale. By combining contextual research with natural‑language generation, Twain creates unique,
  human‑like messages for each prospect, boosting reply rates and reducing campaign preparation time. The service includes
  features such as automated prospect research, email drafting, A/B testing, and performance analytics, aiming to improve
  outbound outreach efficiency and effectiveness for B2B companies.
url: https://raw.githubusercontent.com/api-evangelist/twain/refs/heads/main/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-24 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-23'
modified: '2026-10-23'
tags:
- Company
- AI
- Outreach
- Sales
- Marketing
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/twain-plans-pricing.yml
- type: Security
  url: security/twain-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/twain-authentication.yml
- type: Conformance
  url: conformance/twain-conformance.yml
- type: LLMsTxt
  url: llms/twain-llms.txt
- type: SecurityTxt
  url: well-known/twain-security.txt
- type: SecurityTxt
  url: well-known/twain-intercom-security.txt
- type: SecurityTxt
  url: well-known/twain-api-security.txt
- type: WellKnown
  url: well-known/twain-well-known.yml
- type: Hosts
  url: hosts/twain-hosts.yml
- type: VulnerabilityDisclosure
  url: security/twain-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/twain-domain-security.yml
- type: Website
  url: https://www.twain.ai/
- type: DeveloperPortal
  url: https://www.twain.ai/
- type: Documentation
  url: https://www.twain.ai/
- type: APIReference
  url: https://www.twain.ai/
- type: GettingStarted
  url: https://www.twain.ai/onboarding
- type: Support
  url: https://intercom.help/usetwain/
- type: Blog
  url: https://www.twain.ai/blog
- type: Pricing
  url: https://www.twain.ai/pricing
- type: TermsOfService
  url: https://www.twain.ai/terms
- type: PrivacyPolicy
  url: https://www.twain.ai/privacy
- type: SignUp
  url: https://www.twain.ai/onboarding?authMode=sign-up
apis: []
x-backed-by:
- sequoia-capital
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Homepage loads a JavaScript SPA with no machine‑readable OpenAPI spec discovered.
  evidence:
  - url: https://www.twain.ai/
    status: 200
  checked: '2026-10-24'
x-enrichment:
  date: '2026-10-24'
  status: enriched
  artifacts_added: 19
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Twain API — frequently asked questions

How do I authenticate with the Twain API?

Twain documents its authentication (1 scheme). The details are profiled on APIs.io as Twain Authentication.

How much does the Twain API cost?

APIs.io lists 7 pricing plans for Twain, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Twain API ready for AI agents?

Twain has a Kin Score of 37.0 out of 100 (thin) and an Agent Readiness score of 18.7 (agent-aware), scored by API Evangelist on 2026-10-31.

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