According to Japan's FSA register (read 2026-09-22), registered crypto-asset exchange service providers listing OP for trading: 5.
Source: Financial Services Agency website, "List of registered crypto-asset exchange service providers". Takame rearranged the register's "crypto assets handled" column by coin (read 2026-09-22); this page is not published by the FSA. Official file (FSA)
Name in the register: オプティミズム
| Registered provider | Registration no. | Score |
|---|---|---|
| bitbank関東財務局長 第00004号 | 5.4 | |
| BitTrade関東財務局長 第00007号 | 5.3 | |
| OKJ (OKCoin Japan)関東財務局長 第00020号 | — | |
| Mercury Co., Ltd.関東財務局長 第00025号 | — | |
| Binance関東財務局長 第00031号 | 5.3 |
The register's own note says the crypto assets it lists have only been confirmed, based on each provider's explanation, to meet the definition in the Payment Services Act. The FSA does not guarantee their value or recommend them.