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API

The free tools over the API

Four free tools run without a key at GET or POST /v1/public/tools/{tool}: check_post, split_thread, platform_limits and build_utm_link. They use the same rules as the composer. Public routes allow 30 requests a minute and 1,000 a day per address. The MCP server offers the same tools to assistants.

Also:Free social media toolsThe MCP server1Post API reference

Updated 2026-10-26

  • check_post: how a text counts on each network and which rules it breaks.
  • split_thread: split a long text at each network's limit.
  • platform_limits: every limit in one table.
  • build_utm_link: add campaign parameters to a link.

Use GET with query parameters for short input and POST with a JSON body for long text. The same tools run in your browser on the free tools pages.

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7-day trial for $1. Connect your accounts and schedule a week of posts in one sitting.

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Free in your browser

Free tools

Count characters the way each network does, split threads and preview posts. No account needed.

Open the tools
For builders

API and MCP

Post to every network from your own code or assistant with one key, signed webhooks and idempotent requests.

See the API

Questions

Do the free tools need an account?

No. They need no key and no sign-in.

Free social media tools: counters, previews and moreThe MCP server: 1Post docs1Post API reference: every route, key and role1Post docs: composer, scheduling, API, webhooks, MCP

From one post to every feed

Plan the week in one sitting, keep your team in the loop, and let 1Post publish on time while you get on with the rest of your day.

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