Documentation

One API for OnlyFans and Fansly.

529 endpoints across a signed OnlyFans passthrough and a normalized, Fansly-aware CRM layer. One API key, two platforms — we handle request signing, sessions, proxies and re-login.

Your first request
curl "https://theonlyapi.com/api/crm/{crm_id}/accounts" \
  -H "X-API-Key: <your 43-char key>"

Get started

From zero to a working integration in about five minutes.

Core concepts

The handful of things that explain most surprising responses.

Build with realtime

Events flow from our pollers to your infrastructure.

AI & agents

Every page here is machine-readable, and the API itself is an MCP server.

API reference

Generated from the OpenAPI 3.1 spec.

Reference

Everything else.