API reference · Media

Complete an MCP local-file upload

PUT /media/upload

Upload raw file bytes to the short-lived target returned by the MCP upload_media tool when called without a URL. Send the returned upload token as `Authorization: Bearer …` and the exact returned Content-Type. This endpoint does not accept a PostLake API key and is not called until upload_media has prepared a media id and target.

Request

Authenticate with a bearer API key. Agents calling over MCP authorise with OAuth instead and never handle the key.

curl -X PUT https://api.postlake.dev/media/upload \
  -H "Authorization: Bearer $POSTLAKE_API_KEY"

Response

Uploaded; returns the MediaAsset whose id is ready for create_post (201).

Example

"…"

Limits

Write operations are limited per account, and rate-limit responses include Retry-After. Do not automatically retry a write unless this operation explicitly documents idempotency.

Calling this from an agent

Agents do not call REST. They call tools. Over the hosted MCP server this operation is upload_media, and the agent authorises with OAuth so your API key is never pasted into a chat or seen by the model. The reply comes back in the same normalised shape you see above, which is what lets an agent reason about it without a per-network branch.

You control what any one agent may do with it: which brands it may act for, which networks it may reach, how much it may do in a day, and whether it may spend credits you bought up front. See the MCP server.

Errors

Every failure uses one shape: a stable type, a granular code, the field at fault in param, and a plain-language fix. An agent can act on it without a person reading the message. See Errors and retries.

Check the result before retrying a write. Only operations that explicitly support idempotency can safely replay an Idempotency-Key.

Common questions

Can an AI agent do this without the REST API?

Yes. Over MCP the same job is the upload_media tool. The agent authorises with OAuth, so no API key is pasted into a chat or seen by the model, and the answer comes back in the same normalised shape.

How often can I call this?

Reads are rate limited per account and every response carries X-RateLimit-Remaining and X-RateLimit-Reset. On a 429 the Retry-After header tells you how long to wait.

What happens when it fails?

You get one error shape: a stable type, a granular code you can branch on, the offending field in param, and a fix written so an agent can correct itself rather than stop. Full list on Errors and retries.

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