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sync-api

Build sync. labs (sync.so) lipsync, dubbing and talking-image generation into an app, backend, script or pipeline with the sync. REST API or the official Python (syncsdk) and TypeScript (@sync.so/sdk) SDKs. Covers API keys, uploads, creating generations with idempotency keys, webhooks with signature checks, polling, models, cost estimates, error handling, concurrency limits and the Batch API. Use whenever code calls or should call the sync. API, for example "add lipsync to my Next.js app", "write a Python script that dubs videos with sync.", "handle sync. webhooks", "why does my sync. request return 429", or reviewing an existing sync. integration. Not for making one video in this chat (lipsync, talking-photo, translate-and-dub).

skills/sync-api/SKILL.md

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Nov 7, 2026
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MIT

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# Build with the sync. API

Builds a server-side integration that uploads media, saves each request before submitting it, tracks jobs to completion, and retries without starting duplicate paid work.

## Ground rules

- **Server-side only.** The API key goes in `SYNC_API_KEY` on the server, never in browser or mobile code. Browsers talk to your backend, and your backend talks to sync. Keys come from https://sync.so/settings/api-keys.
- **Base URL** `https://api.sync.so/v2`, header `x-api-key`.
- **SDKs:** Python `pip install syncsdk` (`from sync import Sync`), TypeScript `npm i @sync.so/sdk` (`new SyncClient()`). Both read `SYNC_API_KEY`. The SDKs cover generations (`create`, `get`, `list`) and batches. Some newer request fields can lag behind the API: image inputs, `dubParams`, `dialogueEdit`, `projectId`, uploads and cost estimates. When the installed SDK's types don't include one, call the endpoint over HTTP as the references show, instead of forcing the types.
- **Docs for anything not covered here:** https://sync.so/docs/llms-full.txt, plus the error catalog at `GET https://api.sync.so/v2/errors`, which needs no key.

## The flow to implement

1. **Get the media into sync.** Public `https://` URLs work directly. For user uploads or local files, use the three-step asset upload (presigned URL, `PUT`, register) and keep the returned asset ID. Don't proxy large files through your own API.