Filter the list of callables that are manageable via the JSON API.
jetpack_sync_callable_whitelist
jetpack_sync_callable_whitelist-
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filter jetpack_sync_constants_whitelistFilter the list of PHP constants that are manageable via the JSON API.
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filter jetpack_sync_options_whitelistFilter the list of WordPress options that are manageable via the JSON API.
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action jetpack_sync_user_localeAllow listeners to listen for user local changes
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action jetpack_sync_user_locale_deleteAllow listeners to listen for user local delete changes
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filter jetpack_photon_admin_allow_image_downsizeProvide plugins a way of running Photon for images in the WordPress Dashboard (wp-admin). Note: enabling this will result in Photon URLs added to your post content, which could make migrations across domains (and off Photon) a bit more challenging.
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filter jetpack_show_promotionsWhether promotions are visible or not.
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filter jetpack_format_theme_detailsFilter the array of theme information that will be returned per theme by the Jetpack theme APIs.
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filter jetpack_comment_form_display_greetingFilter whether the comment title can be displayed.
Jetpack Developer Resources 