Caption Generator API

Write scroll-stopping social captions from a short description.

The Caption Generator API lets you write scroll-stopping social captions from a short description. programmatically — a single call, structured output, no prompt engineering. It's part of the Larz Tools API and runs on the same Larz API key you use everywhere else.

Endpoint

Example request

curl https://api.larzos.com/v1/tools/caption \
  -H "Larz-Api-Key: larz_sk_your_key" \
  -H "Content-Type: application/json" \
  -d '{"input":"a photo of a sunset over the ocean"}'

Example response

{
  "id": "larz_run_…",
  "object": "tool_result",
  "tool": "caption",
  "output": "…generated result…",
  "usage": { "tokens": 180 }
}

What you can build

• Add a one-click "caption" feature to your own app.
• Automate marketing workflows at scale.
• Power internal tools, bots, or batch jobs — write scroll-stopping social captions from a short description on demand.

Pricing

Free on the Free tier (200,000 tokens/month, 60 requests/min). Every call returns your remaining quota in the X-Larz-Tokens-Remaining header.

Get an API keyTry Caption Generator free →