curl -X POST https://api.fetchlayer.dev/facebook-ad-library/search-ads \
  -H "Authorization: Bearer ss-your-key" \
  -H "Content-Type: application/json" \
  -d '{"query":"project management software","country":"US","activeStatus":"active","limit":30}'

Tip

Already have an Ad Library URL? Send it to /resolve-url first — it parses the URL into the exact filters to pass here, and does not consume a credit.

3. Follow an ad to its creative

Every ad carries an adArchiveId. Pass it to /ad-media to resolve the video and image files, then stream the bytes from /media.

bash

curl -X POST https://api.fetchlayer.dev/facebook-ad-library/ad-media \
  -H "Authorization: Bearer ss-your-key" \
  -H "Content-Type: application/json" \
  -d '{"ad":"1702938977100376","kinds":["video","image"],"probe":true}'

Tip

GET /media is the one endpoint that takes query parameters instead of a JSON body, and it supports HTTP Range requests — so a video streams and seeks in a player instead of downloading whole.

Error responses

Every error, on every route, is JSON in one shape: error (what went wrong, in words), status, code, retryable and requestId, which also comes as the X-Request-Id header. Branch on code and retryable rather than on the text; on a 5xx the text is generic. Quote requestId when reporting a problem.

json

{
  "error": "Missing required parameter: url",
  "status": 400,
  "missing": ["url"],
  "code": "invalid_input",
  "retryable": false,
  "requestId": "922874e3-c0d0-40d8-8866-d198af132420"
}

code	Status	Retryable	Meaning
invalid_input	400	no	The request needs fixing; error names the field. A missing required parameter also lists it in missing.
unauthorized	401	no	The API key is missing or not valid.
insufficient_credits	402	no	Nothing left to spend: no credits, a used-up free trial, or a monthly allowance and credit balance both spent. error says which. Waiting does not help; topping up does.
forbidden	403	no	This key or account is not allowed this request.
not_found	404	no	What the request names does not exist or is not public.
expired	410	no	What the request refers to is no longer available; ask for it afresh.
quota_exceeded	429	no	A request-rate limit was reached; error says which. Slow down before sending more.
cancelled	499	no	The caller closed or cancelled the request before it finished. The work was stopped and nothing was charged.
time_limit	503	yes	Your timeoutMs ran out before there was anything to return; ask again, or allow more time.
temporarily_unavailable	503	yes	Not available right now; ask again shortly.
store_unreachable	503	yes	Store routes (Shopify, WooCommerce): the store itself can’t be reached right now — it may be offline. Ask again later. Where a store route doesn’t say so yet, an offline store is temporarily_unavailable.
upstream_error	502	yes	The source answered in a way that could not be used; ask again later.
internal_error	500	yes	Something failed on our side; ask again later, and quote requestId if it persists.
tool_error	—	no	MCP only: a tool call failed in a way no other code describes; error says what.

More codes may be added; treat one you do not recognise by its retryable flag. Over MCP, a tool error carries the same fields in structuredContent, and as a JSON text block beside the message.

Next steps

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