Your Thailand Digital Arrival Card, filed by Num.
Fill this in once. A NUM person files it on tdac.immigration.go.th for you, on the first day the site allows (3 days before you arrive).
NUM’s fee$4.99per traveller
Thailand government feeFreeFree, per traveller
NUM is not the Thailand government. You can apply yourself on the official site for free.
Official site. NUM charges $4.99 for the time, and the decision is the government’s alone: nobody can promise approval or speed it up. Can only be filed within 3 days of arrival; Num files it on the right day.
Decision: Instant. Valid: This trip.