x-master-key:

[1] JSONbin UPDATE API Reference | JSONbin.io | Free JSON storage and JSON hosting service. Ideal for small scale Web apps, Websites and Mobile apps (2020-07-23 15:57:11 +09:00) https://jsonbin.io/api-reference/bins/update

secret-key is an optional header. It is required when you need to Update a Private record. You can find your secret-key on the API Keys page after signing-in.

[2] JSONbin UPDATE API Reference | JSONbin.io | Free JSON storage and JSON hosting service. Ideal for small scale Web apps, Websites and Mobile apps, 2023-08-26T02:55:07.000Z, 2018-11-18T15:54:44.050Z https://web.archive.org/web/20181118155404/http://jsonbin.io/api-reference/bins/update

[3] >>2 では secret-key だったのが >>1 の今の版では X-Master-Key と X-Access-Key になっている模様。 2023-08-26T02:59:19.300Z

[4] HTTPヘッダー

ヘッダー名: secret-key
要求: ○
認証情報: はい
廃止後: X-Master-Key
廃止後: X-Access-Key

[5] HTTPヘッダー

ヘッダー名: X-Master-Key
要求: ○
認証情報: はい

[6] HTTPヘッダー

ヘッダー名: X-Access-Key
要求: ○
認証情報: はい

[7] Help & Support - JSONBin.io, 2023-08-26T03:02:57.000Z https://jsonbin.io/support/tags/access-keys-api#questions