Inflection.io
Inflection.io is a B2B marketing automation platform positioned as a modern, AI-native replacement for legacy tools like Marketo. It unifies target accounts, product users, customers, and leads with product-usage, sales, and behavioral signals so marketing teams can build audiences, draft campaigns, map customer journeys, score accounts, and report to the CMO — executing in minutes rather than weeks. The Inflection Developer API is a JSON-over-HTTPS REST API (OpenAPI 3.1, base https://api.inflection.io/v1) for reading and writing the people in a workspace: their profiles, product and marketing activity, static lists, emails, and per-contact personalized email versions, authenticated with scoped Personal Access Tokens or an OAuth 2.1 connected app. Alongside it Inflection runs a first-party remote MCP server at mcp.inflection.io — OAuth 2.1 with PKCE, its own trust and security page — that exposes the authoring surface the REST API does not: journeys, audiences, segments, tokens and analytics, driven by specialist agents. Surfaced as a version-one-ventures portfolio company and enriched from the provider's public developer, agent, and trust surfaces.
Inflection.io publishes 10 API contracts indexed on the APIs.io network, including Contact Activity API, Contacts API, Emails API, and 7 more. Tagged areas include Company, Software-as-a-Service, Marketing, Marketing Automation, and Email Marketing.
The Inflection.io catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.
Inflection.io’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 37 more developer resources.
What this lets a business do 2
Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →
Kin Score
Standards implemented 7
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.
APIs 10
Individual APIs this provider publishes, each with its own machine-readable definition.
Inflection.io Contact Activity API
The Contact Activity API from Inflection.io — 4 operation(s) for contact activity.
Inflection.io Contacts API
The Contacts API from Inflection.io — 6 operation(s) for contacts.
Inflection.io Emails API
The Emails API from Inflection.io — 2 operation(s) for creating and reading HTML emails.
Inflection.io Email Versions API
The Email Versions API from Inflection.io — 1 operation for pushing a per-contact personalized version of a Personalized Email Asset.
Inflection MCP
Inflection's first-party remote MCP server — the agent-facing authoring surface for journeys, audiences, segments, emails, tokens and analytics, gated by OAuth 2.1 with PKCE.
Inflection.io Journeys API
Read journeys (campaigns), their schedule and their derived status.
Inflection.io Lists API
Static and dynamic lists, and static-list members.
Inflection.io Organizations API
Read organizations (company accounts) and a contact's memberships.
Inflection.io Product Users API
Read product users -- the logins underneath a contact -- by id or email, and list them for a contact or an organization.
Inflection.io Stats API
Send and engagement metrics for journeys and emails, with a journey rollup.
Scroll for all 10
Open Collections 3
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Inflection Developer Contact Activity API
OPEN COLLECTIONInflection Developer Contact Activity Contacts API
OPEN COLLECTIONInflection Developer Contact Activity Lists and Members API
OPEN COLLECTIONMCP Servers 1
Model Context Protocol servers that expose these APIs to AI agents.
Inflection MCP
Remote MCP server at mcp.inflection.io over HTTP requiring OAuth; 17 tools listed.
MCP SERVERAgent Skills 5
Packaged agent skills for driving this provider's APIs from an AI assistant.
Batch upsert contacts
AGENT SKILLBuild and populate a static list
AGENT SKILLInflection
AGENT SKILLSync a contact into Inflection
AGENT SKILLInflection.io API pricing
Prices published by Inflection.io, read 2026-10-28 from www.inflection.io/pricing.
| Plan | Price |
|---|---|
| Inflection plan | Starts at $36K/year Includes: Unlimited contact database, unlimited product data, unlimited Salesforce API calls, free unpersonali |
| Custom (high volume) | Custom Pricing |
Plan details, limits and sources →
Billed by: monthly marketed contacts (mmcs) · FinOps profile →
Pricing Plans 2
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Inflectionio Rate Limits
RATE LIMITSService Levels 1
Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.
FinOps 1
Cost, billing, and metering signals for API financial operations.
Inflectionio Finops
FINOPSEvent Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Inflectionio Webhooks
ASYNCAPISpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Inflection.io API Rules
SPECTRALOpenAPI 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.
Inflectionio Openapi Overlay
DERIVEDSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 4
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
Scroll for all 7
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 7
Authentication, authorization, and security posture
Scroll for all 7
Operate 6
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 3
Properties that don't map to a standard resource type
Source (apis.yml)
Inflection.io API — frequently asked questions
Does Inflection.io have an API?
Yes. APIs.io lists 10 APIs from Inflection.io, including Inflection.io Contact Activity API, Inflection.io Contacts API and Inflection.io Emails API, and 7 more.
Is there an OpenAPI specification for the Inflection.io API?
Yes. APIs.io indexes 9 OpenAPI specifications for Inflection.io, each linked for download from this page.
How do I authenticate with the Inflection.io API?
Inflection.io documents its authentication (http/oauth2 · 2 schemes). The details are profiled on APIs.io as Inflectionio Authentication.
How much does the Inflection.io API cost?
Inflection.io publishes its prices; its Inflection plan plan is Starts at $36K/year as of 2026-10-28. APIs.io lists 2 pricing plans for Inflection.io, with each plan's price, limits and inclusions under Pricing on this page.
Does Inflection.io have an MCP server?
Yes. APIs.io lists 1 MCP server for Inflection.io: Remote MCP server at mcp.inflection.io over HTTP requiring OAuth; 17 tools listed.
Is the Inflection.io API ready for AI agents?
Inflection.io has a Kin Score of 67.8 out of 100 (exemplar) and an Agent Readiness score of 57.1 (agent-ready), scored by API Evangelist on 2026-11-06.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.