Primitive
Primitive is a company surfaced as a portfolio company of y-combinator and added to the API Evangelist network as a stub for enrichment. This profile is a lead awaiting the enrichment pipeline.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Primitive the way a machine reads it — 51 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Primitive scores 30.1/100 (thin), with a separate agent-readiness read of 75/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Primitive's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
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title="Primitive on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/primitive.svg"
alt="Primitive Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/primitive/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/primitive/"
title="Primitive on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/primitive/card.svg"
alt="Primitive Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Primitive
Each block below is one kind of artifact we hold for Primitive. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 22
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Primitive Account API
Manage your account settings, storage, and webhook secret
Primitive Agent API
Agent signup and authentication
Primitive CLI API
Browser-assisted CLI authentication
Primitive Demo API
Public, no-account sandbox operations that mirror authenticated endpoints with synthetic data so an agent can learn the request and response shapes before signing up.
Primitive Discovery API
Unauthenticated entry point that lists the API base URL, how to obtain credentials, and the operations callable without a token.
Primitive Domains API
Claim, verify, and manage email domains
Primitive Emails API
List, inspect, and manage received emails
Primitive Endpoints API
Manage webhook endpoints that receive email events
Primitive Filters API
Manage whitelist and blocklist filter rules
Primitive Functions API
Deploy JavaScript handlers that run on inbound mail. Each function is a single ESM module whose default export is an object with an async `fetch(request, env)` method, in the sh...
Primitive Inbox API
Check inbound email setup and processing readiness
Primitive Memories API
Durable org-scoped or function-scoped JSON key-value storage for agents and functions. Keys are caller-defined. Function scope is always addressed by the function id UUID, not b...
Primitive Payments API
Collect and pay stablecoin (USDC) payments with x402. Settlement is non-custodial: funds move directly from payer to payee on-chain via an EIP-3009 authorization the payer signs...
Primitive Registries API
The Agent Registry: ownable directories of agents, addressable by a registry-scoped handle. A registry's publish policy (owner_only, request, or open) decides whether a publish ...
Primitive Routes API
Recipient routing: route inbound mail to a single destination per recipient address. Rules bind an address pattern (exact or wildcard) to an endpoint; `function_id` routes an ad...
Primitive Search API
Semantic and hybrid search across received and sent mail
Primitive Sending API
Send outbound emails through the Primitive API
Primitive Service API
Operational endpoints such as the unauthenticated health/liveness probe.
Primitive Templates API
Public Function template registry reads used to browse installable agent templates.
Primitive Threads API
Conversation threads spanning received and sent emails
Primitive Wake API
Wake scheduling: schedule and send typed wake commands to your own functions over real DKIM-signed email on a cron cadence, and manage the per-target allowlist that authorizes w...
Primitive Webhook Deliveries API
View and replay webhook delivery attempts
Scroll within the panel for all 22 ·
Open Collections 23
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONPrimitive Account API
OPEN COLLECTIONPrimitive Account Agent API
OPEN COLLECTIONPrimitive Account CLI API
OPEN COLLECTIONPrimitive Account Demo API
OPEN COLLECTIONPrimitive Account Discovery API
OPEN COLLECTIONPrimitive Account Domains API
OPEN COLLECTIONPrimitive Account Emails API
OPEN COLLECTIONPrimitive Account Endpoints API
OPEN COLLECTIONPrimitive Account Filters API
OPEN COLLECTIONPrimitive Account Functions API
OPEN COLLECTIONPrimitive Account Inbox API
OPEN COLLECTIONPrimitive Account Memories API
OPEN COLLECTIONPrimitive Account Payments API
OPEN COLLECTIONPrimitive Account Registries API
OPEN COLLECTIONPrimitive Account Routes API
OPEN COLLECTIONPrimitive Account Search API
OPEN COLLECTIONPrimitive Account Sending API
OPEN COLLECTIONPrimitive Account Service API
OPEN COLLECTIONPrimitive Account Templates API
OPEN COLLECTIONPrimitive Account Threads API
OPEN COLLECTIONPrimitive Account Wake API
OPEN COLLECTIONPrimitive Account Webhook Deliveries API
OPEN COLLECTIONScroll within the panel for all 23 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Primitive MCP Server
MCP SERVEREvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Primitive Webhooks
ASYNCAPISecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Primitive — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/primitive · machine-readable index on apis.io
This is an independent, third-party profile of Primitive, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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