Primitive

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 shape of a Workers-style handler. Primitive signs each delivery and forwards the `Primitive-Signature` header to the handler; verify the raw request body with `PRIMITIVE_WEBHOOK_SECRET` before trusting the parsed event. The `event` field is `email.received` for normal inbound mail, or a machine-mail type (`email.bounced`, `email.tls_report`, `email.dmarc_report`, `email.dmarc_failure`) for bounces and reports; the payload shape is otherwise identical. Code runs on Primitive's edge runtime; there is no infrastructure to manage. Secrets land in `env` as encrypted bindings and are refreshed on every redeploy.

GitHub OpenAPI

Operations 20

GET /functions List functions #
POST /functions Deploy a function #
GET /functions/{id} Get a function #
PUT /functions/{id} Update and redeploy a function #
DELETE /functions/{id} Delete a function #
POST /functions/{id}/test Send a test invocation #
GET /functions/{id}/test-runs/{run_id}/trace Get a function test run trace #
GET /functions/routing-topology Get the org's function routing topology #
GET /functions/{id}/routing Get a function's current route binding #
PUT /functions/{id}/route Bind a route to a function #
DELETE /functions/{id}/route Unbind any route from a function #
GET /functions/{id}/secrets List a function's secrets #
POST /functions/{id}/secrets Create or update a secret #
PUT /functions/{id}/secrets/{key} Set a secret by key #
DELETE /functions/{id}/secrets/{key} Delete a secret #
GET /org/secrets List org-level (global) secrets #
POST /org/secrets Create or update an org secret #
PUT /org/secrets/{key} Set an org secret by key #
DELETE /org/secrets/{key} Delete an org secret #
GET /functions/{id}/logs List a function's execution logs #

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/primitive/refs/heads/main/openapi/primitive-functions-api-openapi.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/primitive-functions-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

primitive-functions-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Primitive Functions API
  version: 1.0.0
  description: Primitive is email infrastructure for AI agents.
  contact:
    name: Primitive
    url: https://primitive.dev
  license:
    name: Proprietary
    url: https://primitive.dev/terms
  x-stability-level: stable
  x-deprecation-policy: 'Breaking changes are announced at least 6 months in advance. Deprecated fields carry x-deprecated: true. The current stable version is v1.'
servers:
- url: https://api.primitive.dev/v1
  description: Canonical API host (PRIMITIVE_API_BASE_URL). Carries every public API operation.
tags:


# --- truncated at 32 KB (123 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/primitive/refs/heads/main/openapi/primitive-functions-api-openapi.yml