afb (formerly アフィリエイトB, i.e. Affiliate B) is a Japanese affiliate network operating since around 2006. It is run by For it Inc., a company founded on 1 April 2010.
As of August 2025, the network had run about 17,000 advertising campaigns in total and had about 1.18 million registered sites, with cumulative affiliate payouts above JPY 120 billion. Key categories are consumer loans, beauty and clinics, education and languages, and VOD — including Aiful, Berlitz, JR Central, U-NEXT, Oisix and TEMU.
The home page shows only sample advertisers and categories; the programme list and rates are not public. The site and dashboard are in Japanese only.
| Network type | CPA network |
| Billing model | CPS, CPA |
| GEO / market | Japan |
| Individual accounts | yes |
| Operator | For it Inc. |
Payouts are on a CPS and CPA basis. Sign-up includes site and identity (phone) verification, and applicants outside Japan can join only with a Japanese bank account.
The minimum payout is JPY 777 net; funds are transferred free of charge at the end of the following month.