Can an AI agent post to Lemmy?

Yes. Connect Lemmy in Mynahcast, give your agent an Agent API key, and it can draft and schedule Lemmy posts through the MCP server (https://api.mynahcast.xyz/mcp) or the REST API. Each post waits for your approval before it goes out.

How do I post to Lemmy with an API?

Send POST https://api.mynahcast.xyz/v1/posts with your API key as a bearer token, the brand id, the post body and your Lemmy channel id as a target. Add an Idempotency-Key header so a retry never posts twice.

What is the character limit for Lemmy posts in Mynahcast?

Up to 10,000 characters per post. Mynahcast checks the limit before saving, so an agent finds out at validation time, not at publish time.

Is posting to Lemmy with Mynahcast free?

Every Mynahcast plan includes every live channel, from $12 per month (5 channels) with a 7-day free trial.

Live

Lemmy

Posts into a community on any Lemmy instance.

What it supports

Up to 10,000 characters per post, with formatting.
Text only (no media uploads on this channel yet).
Every post is read back from the platform by its id after it goes out.
Approvals, scheduling and one-time delivery work the same as on every other channel.

How to connect

In Mynahcast: Channels → Add channel → Lemmy.

Sign in

1Use your Lemmy username and password once: we exchange them for a session token and never store the password.
2Community: its name (e.g. technology, or technology@lemmy.world for a remote one).

You'll paste

Your Lemmy instance
Username or email
Password
2FA code (if enabled)
Community

Credentials are encrypted before they're stored and never shown again. Disconnect any time from the Channels page.

Post to Lemmy from your AI agent

Once Lemmy is connected, any agent with a Mynahcast key can target it: Claude Code, Cursor and other MCP clients through mynahcast_create_post, ChatGPT through a GPT action, or your own code through the REST API. Connect your agent.

REST: schedule a Lemmy post

curl -X POST "https://api.mynahcast.xyz/v1/posts" \
  -H "Authorization: Bearer $MYNAHCAST_KEY" \
  -H "Idempotency-Key: lemmy-001" \
  -H "Content-Type: application/json" \
  -d '{
    "brandId": "<brand-uuid>",
    "content": { "body": "Your post text" },
    "targets": [{ "channelId": "<lemmy-channel-uuid>" }]
  }'

Frequently asked questions

Can an AI agent post to Lemmy?: Yes. Connect Lemmy in Mynahcast, give your agent an Agent API key, and it can draft and schedule Lemmy posts through the MCP server (https://api.mynahcast.xyz/mcp) or the REST API. Each post waits for your approval before it goes out.
How do I post to Lemmy with an API?: Send POST https://api.mynahcast.xyz/v1/posts with your API key as a bearer token, the brand id, the post body and your Lemmy channel id as a target. Add an Idempotency-Key header so a retry never posts twice.
What is the character limit for Lemmy posts in Mynahcast?: Up to 10,000 characters per post. Mynahcast checks the limit before saving, so an agent finds out at validation time, not at publish time.
Is posting to Lemmy with Mynahcast free?: Every Mynahcast plan includes every live channel, from $12 per month (5 channels) with a 7-day free trial.

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