Millimetric

Millimetric is API-first, privacy-respecting web and product analytics for developers, indie startups ("vibe coders"), and AI agents. It captures events over a simple REST API (/v1/track, /v1/batch, /v1/identify, /v1/query, /v1/stats, /v1/sources), a ~1.8 KB browser SDK, and a zero-dependency Node SDK, with a built-in attribution classifier that splits paid versus organic social traffic (the Facebook social-vs-paid split). It stores no cookies and no raw IPs — GDPR/CCPA compliant, with a /v1/forget right-to-be-forgotten endpoint — and ships a first-class hosted Model Context Protocol (MCP) server so AI agents emit and query analytics natively. Backed by Seedcamp.

Millimetric publishes 3 API contracts indexed on the APIs.io network: Identity API, Ingest API, and Read API. Tagged areas include Company, Analytics, Web Analytics, Product Analytics, and Attribution.

The Millimetric catalog on APIs.io includes 1 Spectral governance ruleset.

Millimetric’s developer surface includes documentation, API reference, getting-started guide, support, pricing, signup flow, authentication, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

47.7/100 developing ▬ flat Agent 49/100 agent native Front door AI 6/6 dominant 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 Analytics Web Analytics Product Analytics Attribution Privacy MCP AI Agents Event Developer Tools

Kin Score

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

Composite quality — 47.7/100 · developing

Contract Quality 2.8 / 19

Developer Ergonomics 9.6 / 15

Access Clarity 13.0 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 4.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 49/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 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 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):

A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)

4 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 14.9 — up to +21.3 composite points
Operational Transparency scores 21.1 — up to +10.3 composite points
Contract Governance scores 18.2 — up to +9.8 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/millimetric/apis.yml: open an issue on github.com/api-evangelist/millimetric 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 →

Standards implemented 2

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)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

Millimetric Identity API

Link anonymous visitors to known users and honor deletion requests.

Millimetric Ingest API

Write events into a project.

Millimetric Read API

Query raw events and aggregated stats and attribution.

Open Collections 3

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

Millimetric Analytics Identity API

OPEN COLLECTION

Millimetric Analytics Identity Ingest API

OPEN COLLECTION

Millimetric Analytics Identity Read API

OPEN COLLECTION

Arazzo Workflows 3

Multi-step API workflows described with the Arazzo specification.

Stitch an anonymous visitor to a known user

Track anonymously, identify on login, tag subsequent events, then read the user's history.

ARAZZO

Capture an event and analyze traffic sources

Emit an event, then pull aggregate stats and the paid-vs-social attribution split.

ARAZZO

GDPR right-to-be-forgotten

Confirm a user's events, then permanently delete them with a secret key.

ARAZZO

MCP Servers 1

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

Millimetric MCP Server

Millimetric ships a first-class, hosted Model Context Protocol server. Any MCP client (Claude Code, Claude Desktop, MCP Inspector, custom agents) connects with a server-side key...

MCP SERVER

Agent Skills 3

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

Honor a GDPR/CCPA right-to-be-forgotten request

AGENT SKILL

Stitch anonymous visitors to known users

AGENT SKILL

Instrument a product and report on traffic sources

AGENT SKILL

Millimetric API pricing

Prices published by Millimetric, read 2026-10-28 from www.millimetric.ai/#pricing.

Plan	Price
FREE	$0 Includes: 100k events / month, 30-day retention, 1 project, Browser + Node SDKs, Community support
PRO	$19 Includes: 1M events / month, 90-day retention, Unlimited projects, MCP server access, Email support
BUSINESS	$99 Includes: 10M events / month, 365-day retention, Unlimited projects, MCP server access, Priority support

Plan details, limits and sources →

Billed by: events · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Millimetric Plans

3 plans

PLANS

Millimetric Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Millimetric Rate Limits

2 limits

RATE LIMITS

Service Levels 1

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

Millimetric

SLA

FinOps 1

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

Millimetric Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Millimetric API Rules

65 rules · 63 errors 1 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.

Millimetric Openapi Overlay

4 actions · update · millimetric-openapi.yml

DERIVED

Security Posture 2

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

Millimetric Authentication

http · 1 scheme

SECURITY

Millimetric Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Millimetric Agentic Access

7 operations · 4 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

AgenticAccess

AgentSkill

Design & Contract 9

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Lifecycle

Conformance

DataModel

Arazzo

Arazzo

Arazzo

Scroll for all 9

Build 3

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Packages

Packages

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Compliance

Compliance

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: millimetric
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
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/millimetric.png
name: Millimetric
description: Millimetric is API-first, privacy-respecting web and product analytics for developers, indie startups ("vibe
  coders"), and AI agents. It captures events over a simple REST API (/v1/track, /v1/batch, /v1/identify, /v1/query, /v1/stats,
  /v1/sources), a ~1.8 KB browser SDK, and a zero-dependency Node SDK, with a built-in attribution classifier that splits
  paid versus organic social traffic (the Facebook social-vs-paid split). It stores no cookies and no raw IPs — GDPR/CCPA
  compliant, with a /v1/forget right-to-be-forgotten endpoint — and ships a first-class hosted Model Context Protocol (MCP)
  server so AI agents emit and query analytics natively. Backed by Seedcamp.
url: https://raw.githubusercontent.com/api-evangelist/millimetric/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- seedcamp
x-tier: enriched
x-tier-reason: real-api-surface
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Company
- Analytics
- Web Analytics
- Product Analytics
- Attribution
- Privacy
- MCP
- AI Agents
- Event
- Developer Tools
tags_raw:
- Company
- Analytics
- Web Analytics
- Product Analytics
- Attribution
- Privacy
- MCP
- AI Agents
- Events
- Developer Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 1
  artifacts_updated: 7
  pass: local-v1
  note: Round 2. Added the MCP-to-REST tool crosswalk; re-probed the contract, /.well-known/, npm, MCP tools/list, the status
    page and the advertised changelog. Removed the StatusPage pointer — https://status.millimetric.ai returned HTTP 525 on
    both probes (2026-07-20 and 2026-08-13) and has never served a page.
apis:
- aid: millimetric:millimetric-identity-api
  name: Millimetric Identity API
  description: Link anonymous visitors to known users and honor deletion requests.
  humanURL: https://docs.millimetric.ai/api-reference/overview
  baseURL: https://api.millimetric.ai
  tags:
  - Identity
  properties:
  - type: OpenAPI
    url: openapi/millimetric-identity-api-openapi.yml
  - type: Documentation
    url: https://docs.millimetric.ai
  - type: APIReference
    url: https://docs.millimetric.ai/api-reference/overview
- aid: millimetric:millimetric-ingest-api
  name: Millimetric Ingest API
  description: Write events into a project.
  humanURL: https://docs.millimetric.ai/api-reference/overview
  baseURL: https://api.millimetric.ai
  tags:
  - Ingest
  properties:
  - type: OpenAPI
    url: openapi/millimetric-ingest-api-openapi.yml
  - type: Documentation
    url: https://docs.millimetric.ai
  - type: APIReference
    url: https://docs.millimetric.ai/api-reference/overview
- aid: millimetric:millimetric-read-api
  name: Millimetric Read API
  description: Query raw events and aggregated stats and attribution.
  humanURL: https://docs.millimetric.ai/api-reference/overview
  baseURL: https://api.millimetric.ai
  tags: []
  tags_raw:
  - Read
  properties:
  - type: OpenAPI
    url: openapi/millimetric-read-api-openapi.yml
  - type: Documentation
    url: https://docs.millimetric.ai
  - type: APIReference
    url: https://docs.millimetric.ai/api-reference/overview
common:
- type: Website
  url: https://millimetric.ai
- type: DeveloperPortal
  url: https://docs.millimetric.ai
- type: Documentation
  url: https://docs.millimetric.ai
- type: APIReference
  url: https://docs.millimetric.ai/api-reference/overview
- type: GettingStarted
  url: https://docs.millimetric.ai/quickstart
- type: Support
  url: mailto:hello@millimetric.ai
- type: Pricing
  url: https://millimetric.ai/#pricing
- type: SignUp
  url: https://millimetric.ai/signup
- type: Login
  url: https://millimetric.ai/login
- type: TermsOfService
  url: https://millimetric.ai/legal/terms
- type: PrivacyPolicy
  url: https://millimetric.ai/legal/privacy
- type: OpenAPI
  url: openapi/_original/millimetric-openapi.yml
- type: MCPServer
  url: mcp/millimetric-mcp.yml
- type: ToolCrosswalk
  url: mcp/millimetric-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/millimetric-llms.txt
- type: Authentication
  url: authentication/millimetric-authentication.yml
- type: AgenticAccess
  url: agentic-access/millimetric-agentic-access.yml
- type: DomainSecurity
  url: security/millimetric-domain-security.yml
- type: Conventions
  url: conventions/millimetric-conventions.yml
- type: Idempotency
  url: conventions/millimetric-conventions.yml
- type: ErrorCatalog
  url: errors/millimetric-error-codes.yml
- type: RateLimits
  url: rate-limits/millimetric-rate-limits.yml
- type: Plans
  url: plans/millimetric-plans.yml
- type: Lifecycle
  url: lifecycle/millimetric-lifecycle.yml
- type: Packages
  url: packages/millimetric-packages.yml
- type: SDKs
  url: packages/millimetric-packages.yml
- type: Conformance
  url: conformance/millimetric-conformance.yml
- type: Compliance
  url: https://millimetric.ai/legal/dpa
- type: DataModel
  url: data-model/millimetric-data-model.yml
- type: Overlay
  url: overlays/millimetric-openapi-overlay.yaml
- type: AgentSkill
  url: skills/_index.yml
- type: Arazzo
  name: Capture an event and analyze traffic sources
  url: arazzo/millimetric-capture-and-analyze.yml
- type: Arazzo
  name: Stitch an anonymous visitor to a known user
  url: arazzo/millimetric-anonymous-to-known.yml
- type: Arazzo
  name: GDPR right-to-be-forgotten
  url: arazzo/millimetric-gdpr-delete.yml

Millimetric API — frequently asked questions

Does Millimetric have an API?

Yes. APIs.io lists 3 APIs from Millimetric, including Millimetric Identity API, Millimetric Ingest API and Millimetric Read API.

Is there an OpenAPI specification for the Millimetric API?

Yes. APIs.io indexes 3 OpenAPI specifications for Millimetric, each linked for download from this page.

How do I authenticate with the Millimetric API?

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

How much does the Millimetric API cost?

Millimetric publishes its prices; its FREE plan is $0 as of 2026-10-28. APIs.io lists 3 pricing plans for Millimetric, with each plan's price, limits and inclusions under Pricing on this page.

Does Millimetric have an MCP server?

Yes. APIs.io lists 1 MCP server for Millimetric: Millimetric ships a first-class, hosted Model Context Protocol server. Any MCP client (Claude Code, Claude Desktop, MCP Inspector, custom agents) connects with a server-side key and uses the same oper

Is the Millimetric API ready for AI agents?

Millimetric has a Kin Score of 47.7 out of 100 (developing) and an Agent Readiness score of 48.8 (agent-native), scored by API Evangelist on 2026-11-06.

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