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X (Twitter) | LynCut API

Attach videos to posts on X — chunked media upload with tweet text.

X (Twitter) integration

X API v2 media publishing: chunked video upload attached to a post with text.

Key capabilities

  • Chunked media upload — INIT/APPEND/FINALIZE flow for large videos.
  • Post text — tweet copy attached to the video.
  • Duration handling — server-side validation against the account's video limit.

Use cases

  • Push teaser clips to X right after render.
  • Cross-post short vertical cuts to X and other short-form feeds.

Publish to X (Twitter)

curl -X POST "https://api.lyncut.com/v1/publishing/jobs" \
  -H "x-lyncut-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"connectionId":"con_x","mediaKey":"upl_77kd","title":"My video"}'

Parameters

FieldTypeDescription
title *stringPost text — counts against the 280-character limit.

Frequently Asked Questions

Video length limit?+

Standard accounts post up to 140 seconds; Premium accounts up to ~4 hours. The API returns MEDIA_TOO_LONG if exceeded.

Why did my media fail to attach?+

X requires media processing to finish before the post. The job polls processing status — retry the job if it timed out.

Best practices

  • Keep clips under 140 seconds to work on any account tier.
  • Front-load the hook — X truncates text after 280 characters.

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