API Tutorial
How to post to Reddit via API
To post to Reddit via API, connect the Reddit account through Modiva (which handles OAuth and scopes), then call the `posts_create` tool with your text and media — Modiva publishes it to Reddit and returns the post ID.
Reddit's own API requires app review, OAuth handling and the right publishing permissions before you can post a single update. Modiva does all of that for you and exposes a single `posts_create` tool that publishes to Reddit (and every other connected platform) the same way.
Step by step
Create a Modiva account and MCP key
Sign up free and generate an MCP key (`mk_live_…`) from the dashboard. The same key authenticates both the hosted MCP server (for AI agents) and the REST API (for your backend), so you only manage one credential.
Connect your Reddit account
From the dashboard, click Connect and choose Reddit. Modiva runs the OAuth flow and requests the right scopes for you, then stores the access + refresh tokens in an encrypted vault and keeps them fresh — you never handle Reddit's raw API credentials. The connection gets a stable `connectionId` you reference in every call.
Call posts_create to publish to Reddit
Invoke the `posts_create` tool with the connection ID and your content. Modiva validates the payload against Reddit's format rules (length, media types, aspect ratios) and publishes immediately, returning the live post ID and URL.
Go further — schedule, cross-post, automate
The same call powers an AI agent over MCP: point Claude or Cursor at `https://mcp.modiva.ai/v1` and it can post to Reddit on your behalf. Swap `posts_create` for `posts_schedule` to queue it, or `posts_cross_post` to fan one post out to every platform at once.
Example request
Call the posts_create tool through Modiva’s REST API. The same tool is available to AI agents over the MCP server at https://mcp.modiva.ai/v1.
curl -X POST https://api.modiva.ai/v1/tools/invoke \
-H "Authorization: Bearer mk_live_…" \
-H "Content-Type: application/json" \
-d '{
"tool": "posts_create",
"connectionId": "conn_…",
"args": { "text": "Shipped via Modiva 🚀" }
}'Try it with Reddit
Start freeFAQ
Do I need a Reddit developer app to post via the API?
No. Modiva owns the reviewed Reddit app and handles OAuth, so you connect with a click and start posting — no app review, no scope wrangling.
Can an AI agent post to Reddit for me?
Yes. The same `posts_create` tool is exposed over the Model Context Protocol, so any MCP client (Claude, Cursor, etc.) can publish to Reddit once you add your Modiva MCP key.