# Primitive

**Canonical:** https://apis.io/providers/primitive/  
**APIs profiled:** 22

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.

## Kin Score — 28.3 / 100 (thin)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 28.3).

| Facet | Score |
|---|---|
| Discoverability | 40.7 |
| Contract Quality | 74.8 |
| Governance | 20.8 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 15.2 |
| Commercial Clarity | 0.0 |

## Agent readiness — 67.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| MCP Server | yes |
| Auth Clarity | no |
| Idempotency | verified |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | verified |
| Event Surface Described | yes |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |

## APIs (22)

- **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

## MCP servers (1)

- **primitive-mcp.yml**

## Agentic access (1)

- **Primitive Agentic Access** — 129 operations · 76 acting · 1 human-in-the-loop

## Security (3)

- **Primitive Authentication** — apiKey/http · 2 schemes
- **Primitive Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Primitive Vulnerability Disclosure** — security.txt · contact published

## Tags

Company

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/primitive/). Scores are computed from the provider's own public artifacts under a published rubric.