Authentication
All requests use your FetchLayer API key as a Bearer token. No Amazon account, no Product Advertising API access, no Associates tag and no seller credentials are required.
Sending requests
bash
curl -X POST https://api.fetchlayer.dev/amazon/price-check \
-H "Authorization: Bearer ss-your-key" \
-H "Content-Type: application/json" \
-d '{"asins":["B09B8V1LZ3","B00FLYWNYQ"],"marketplace":"com"}'Keep your key secret
Only use API keys in server-side code and rotate a key immediately if it is exposed.
Every route is a POST
All four Amazon endpoints take a JSON body over POST. There is no query-string route, so the key never travels in a URL. Unrecognised body fields are rejected with a 400 naming the field, so a typo fails loudly instead of returning unfiltered results.
Authentication errors
A missing or invalid key returns HTTP 401.
json
{
"error": "Invalid API key"
}