Can an AI agent post to Listmonk?

Yes. Connect Listmonk in Mynahcast, give your agent an Agent API key, and it can draft and schedule Listmonk 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 Listmonk 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 Listmonk channel id as a target. Add an Idempotency-Key header so a retry never posts twice.

What is the character limit for Listmonk posts in Mynahcast?

Up to 200,000 characters per post. Mynahcast checks the limit before saving, so an agent finds out at validation time, not at publish time.

Is posting to Listmonk with Mynahcast free?

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

Live

Listmonk

Sends a post as a newsletter campaign from your Listmonk.

What it supports

Up to 200,000 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 → Listmonk.

API user + token

1In Listmonk: Admin → Users → New → type “API”, give it a role that can manage campaigns and read lists → copy the token.
2Lists: the list IDs or names to send to, separated by commas (Lists page shows the IDs).
3Each scheduled post becomes a campaign and starts sending at its time.

You'll paste

Listmonk address
API username
API token
Lists

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

Post to Listmonk from your AI agent

Once Listmonk 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 Listmonk post

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

Frequently asked questions

Can an AI agent post to Listmonk?: Yes. Connect Listmonk in Mynahcast, give your agent an Agent API key, and it can draft and schedule Listmonk 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 Listmonk 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 Listmonk channel id as a target. Add an Idempotency-Key header so a retry never posts twice.
What is the character limit for Listmonk posts in Mynahcast?: Up to 200,000 characters per post. Mynahcast checks the limit before saving, so an agent finds out at validation time, not at publish time.
Is posting to Listmonk 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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