Every ThreadSnoop API request needs a key. Create one at /developer after signing up — 1,000 free reads, no card required.
Pass your key as either header — both are accepted on every request:
x-api-key: ts_live_YOUR_KEY
# or
Authorization: Bearer ts_live_YOUR_KEYA missing key returns 401; an unknown or revoked key also returns 401. See Errors for the full list of status codes.