Mixmax

Mixmax is an AI-native sales engagement and execution platform that lives inside Gmail and Outlook, helping sales, customer success, recruiting, and other relationship-driven teams run their entire customer journey without context-switching. It combines email tracking and templates, multi-channel sequences, one-click scheduling, CRM automation, engagement signals, and Meeting Copilot summaries and transcripts. Mixmax exposes a public REST API (api.mixmax.com/v1) for lightweight real-time access to contacts, contact groups, sequences and recipients, file requests, meeting summaries and transcripts, and snippet tags, authenticated with an API token, plus message integrations and Sidebar/Widget SDKs for extending the product surface. Since April 2026 Mixmax also runs a first-party remote MCP server at mcp.mixmax.com/mcp — read-only, OAuth 2.0 with PKCE against its own OpenID Connect provider, scoped meetings:read — together with six installable Claude Skills, a rule-driven incoming and outgoing webhook surface with a documented event catalog, and published per-tier pricing.

Mixmax publishes 6 API contracts indexed on the APIs.io network, including Contact Groups API, Contacts API, File Requests API, and 3 more. Tagged areas include Company, Software-as-a-Service, MCP, Agents, and Webhook.

The Mixmax catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Mixmax’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

59.9/100 strong ▬ flat Agent 50/100 agent ready Front door AI 5/6 prominent Heartbeat 51/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 3 Agent Skills

Company Software-as-a-Service MCP Agents Webhook OAuth Sales Engagement Email Sales CRM Productivity Meetings Sequences Authentication

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 59.9/100 · strong

Contract Quality 4.7 / 19

Developer Ergonomics 9.3 / 15

Access Clarity 15.0 / 15

Operational Transparency 5.4 / 10

Contract Governance 2.9 / 9

Discoverability 5.5 / 8

Regulatory Posture 5.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 50/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 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

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 25.0 — up to +18.8 composite points
Contract Governance scores 31.8 — up to +8.2 composite points
Developer Ergonomics scores 61.9 — up to +7.6 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/mixmax/apis.yml: open an issue on github.com/api-evangelist/mixmax 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
Workplace Collaboration App Marketplaces	builds-on	26.7	-	-
Zoom App Marketplace and Partner Ecosystem (builders and partners on Zoom)	builds-on	26.7	-	-

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 8

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.

Model Context Protocol (MCP)

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

OAuth

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

Agent Skills

measured — observed by APIs.io (published)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

OpenID Connect

measured — observed by APIs.io (declared)

APIs 6

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

Mixmax Contact Groups API

Contact groups you own or that are shared with you — deprecated

Mixmax Contacts API

Mixmax Contacts (people you've emailed) — deprecated resource group

Mixmax File Requests API

File requests you've sent out

Mixmax Meetings API

Meeting Copilot summaries and transcripts (requires mixmaxApi feature)

Mixmax Sequences API

Sequences you have access to, and their recipients

Mixmax Snippet Tags API

Snippet tag management

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Mixmax REST Contact Groups API

OPEN COLLECTION

Mixmax REST Contact Groups Contacts API

OPEN COLLECTION

Mixmax REST Contact Groups File Requests API

OPEN COLLECTION

Mixmax REST Contact Groups Meetings API

OPEN COLLECTION

Mixmax REST Contact Groups Sequences API

OPEN COLLECTION

Mixmax REST Contact Groups Snippet Tags API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Mixmax MCP Server

Remote MCP server over streamable HTTP.

MCP SERVER

Agent Skills 3

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

List sequences and page through their recipients

AGENT SKILL

Pull Mixmax meeting summaries and transcripts

AGENT SKILL

Search and read Mixmax contacts

AGENT SKILL

Mixmax API pricing

Prices published by Mixmax, read 2026-10-28 from www.mixmax.com/pricing. A free plan or tier is listed.

Plan	Price
Free (50 recipients a month)	$0 per user Includes: 50 recipients a month, Limited features
100 recipients a month	$29 per user Includes: 100 recipients a month, All features included
1,500 recipients a month	Free instead of $89 for 14 days per user Includes: 1,500 recipients a month, All features included
3,000 recipients a month	$129 per user Includes: 3,000 recipients a month, All features included
Custom branding & domains (add-on)	$9 per member a month
Advanced workspace rules (add-on)	$9 per member a month
Salesforce Insights Package (add-on)	$9 per member a month
Dialer (add-on)	$9/member a month + usage per member a month plus usage

Plan details, limits and sources →

Billed by: user · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Mixmax Plans Pricing

8 plans

PLANS

Mixmax Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mixmax Rate Limits

1 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Mixmax

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Mixmax Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Mixmax Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Mixmax API Rules

52 rules · 49 errors 2 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Mixmax Openapi Overlay

2 actions · update · mixmax-openapi.yml

DERIVED

Security Posture 3

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

Mixmax Authentication

apiKey/oauth2/openIdConnect · 3 schemes

SECURITY

Mixmax Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Mixmax Trust Center

SOC 2, HIPAA, GDPR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Mixmax Scopes

3 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Mixmax Agentic Access

24 operations · 12 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Webhooks

Webhooks

ErrorCatalog

ErrorCatalog

Build 4

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

ToolCrosswalk

ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

Compliance

DomainSecurity

OAuthScopes

Operate 4

Status, limits, changes, and where to get help

RateLimits

StatusPage

Support

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: mixmax
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mixmax.png
name: Mixmax
description: Mixmax is an AI-native sales engagement and execution platform that lives inside Gmail and Outlook, helping sales,
  customer success, recruiting, and other relationship-driven teams run their entire customer journey without context-switching.
  It combines email tracking and templates, multi-channel sequences, one-click scheduling, CRM automation, engagement signals,
  and Meeting Copilot summaries and transcripts. Mixmax exposes a public REST API (api.mixmax.com/v1) for lightweight real-time
  access to contacts, contact groups, sequences and recipients, file requests, meeting summaries and transcripts, and snippet
  tags, authenticated with an API token, plus message integrations and Sidebar/Widget SDKs for extending the product surface.
  Since April 2026 Mixmax also runs a first-party remote MCP server at mcp.mixmax.com/mcp — read-only, OAuth 2.0 with PKCE
  against its own OpenID Connect provider, scoped meetings:read — together with six installable Claude Skills, a rule-driven
  incoming and outgoing webhook surface with a documented event catalog, and published per-tier pricing.
url: https://raw.githubusercontent.com/api-evangelist/mixmax/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- creandum
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Company
- Software-as-a-Service
- MCP
- Agents
- Webhook
- OAuth
- Sales Engagement
- Email
- Sales
- CRM
- Productivity
- Meetings
- Sequences
- Authentication
tags_raw:
- Company
- Saas
- MCP
- Agents
- Webhooks
- OAuth
- Sales Engagement
- Email
- Sales
- CRM
- Productivity
- Meetings
- Sequences
- Authentication
apis:
- aid: mixmax:mixmax-contact-groups-api
  name: Mixmax Contact Groups API
  description: Contact groups you own or that are shared with you — deprecated
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - Contact Groups
  properties:
  - type: OpenAPI
    url: openapi/mixmax-contact-groups-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
- aid: mixmax:mixmax-contacts-api
  name: Mixmax Contacts API
  description: Mixmax Contacts (people you've emailed) — deprecated resource group
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/mixmax-contacts-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
- aid: mixmax:mixmax-file-requests-api
  name: Mixmax File Requests API
  description: File requests you've sent out
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - File Requests
  properties:
  - type: OpenAPI
    url: openapi/mixmax-file-requests-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
- aid: mixmax:mixmax-meetings-api
  name: Mixmax Meetings API
  description: Meeting Copilot summaries and transcripts (requires mixmaxApi feature)
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - Meetings
  properties:
  - type: OpenAPI
    url: openapi/mixmax-meetings-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
- aid: mixmax:mixmax-sequences-api
  name: Mixmax Sequences API
  description: Sequences you have access to, and their recipients
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - Sequences
  properties:
  - type: OpenAPI
    url: openapi/mixmax-sequences-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
- aid: mixmax:mixmax-snippet-tags-api
  name: Mixmax Snippet Tags API
  description: Snippet tag management
  humanURL: https://developer.mixmax.com/
  baseURL: https://api.mixmax.com/v1
  tags:
  - Snippet Tags
  properties:
  - type: OpenAPI
    url: openapi/mixmax-snippet-tags-api-openapi.yml
  - type: Authentication
    url: authentication/mixmax-authentication.yml
  - type: Conventions
    url: conventions/mixmax-conventions.yml
  - type: RateLimits
    url: rate-limits/mixmax-rate-limits.yml
  - type: Lifecycle
    url: lifecycle/mixmax-lifecycle.yml
  - type: DataModel
    url: data-model/mixmax-data-model.yml
  - type: Conformance
    url: conformance/mixmax-conformance.yml
  - type: LLMsTxt
    url: llms/mixmax-llms.txt
  - type: WellKnown
    url: well-known/mixmax-well-known.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/mixmax-rate-limits.yml
- type: MCPServer
  url: mcp/mixmax-mcp.yml
- type: Overlay
  url: overlays/mixmax-openapi-overlay.yaml
- type: AgenticAccess
  url: agentic-access/mixmax-agentic-access.yml
- type: TrustCenter
  url: security/mixmax-trust-center.yml
- type: Compliance
  url: https://www.mixmax.com/security
- type: DomainSecurity
  url: security/mixmax-domain-security.yml
- type: Packages
  url: packages/mixmax-packages.yml
- type: SDKs
  url: packages/mixmax-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: StatusPage
  url: https://status.mixmax.com/
- type: DeveloperPortal
  url: https://developer.mixmax.com/
- type: Documentation
  url: https://developer.mixmax.com/docs/getting-started
- type: APIReference
  url: https://developer.mixmax.com/reference/getting-started-with-the-api
- type: GettingStarted
  url: https://developer.mixmax.com/reference/getting-started-with-the-api
- type: GitHubOrganization
  url: https://github.com/mixmaxhq
- type: Support
  url: https://success.mixmax.com/
- type: Blog
  url: https://www.mixmax.com/blog
- type: Pricing
  url: https://www.mixmax.com/pricing
- type: SignUp
  url: https://app.mixmax.com/signup
- type: Login
  url: https://app.mixmax.com/dashboard
- type: TermsOfService
  url: https://www.mixmax.com/legal/terms-of-service
- type: PrivacyPolicy
  url: https://www.mixmax.com/legal/privacy-policy
- type: Website
  url: https://www.mixmax.com/
- type: ToolCrosswalk
  url: mcp/mixmax-tool-crosswalk.yml
- type: OAuthScopes
  url: scopes/mixmax-scopes.yml
- type: Webhooks
  url: asyncapi/mixmax-webhooks.yml
- type: Plans
  url: plans/mixmax-plans-pricing.yml
- type: ChangeLog
  url: changelog/mixmax-changelog.yml
- type: ErrorCatalog
  url: errors/mixmax-problem-types.yml
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 18
  pass: local-v1

Mixmax API — frequently asked questions

Does Mixmax have an API?

Yes. APIs.io lists 6 APIs from Mixmax, including Mixmax Contact Groups API, Mixmax Contacts API and Mixmax File Requests API, and 3 more.

Is there an OpenAPI specification for the Mixmax API?

Yes. APIs.io indexes 6 OpenAPI specifications for Mixmax, each linked for download from this page.

How do I authenticate with the Mixmax API?

Mixmax documents its authentication (apiKey/oauth2/openIdConnect · 3 schemes). The details are profiled on APIs.io as Mixmax Authentication.

How much does the Mixmax API cost?

Mixmax publishes its prices; its Free (50 recipients a month) plan is $0 per user as of 2026-10-28. APIs.io lists 8 pricing plans for Mixmax, with each plan's price, limits and inclusions under Pricing on this page.

Does Mixmax have an MCP server?

Yes. APIs.io lists 1 MCP server for Mixmax: Remote MCP server over streamable HTTP.

Is the Mixmax API ready for AI agents?

Mixmax has a Kin Score of 59.9 out of 100 (strong) and an Agent Readiness score of 50.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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