Can't create a release using the API

This is the exact format for the curl request I’m sending:
curl https://sentry.io/api/0/organizations/<org_name>/releases -X POST -H "Authorization:Bearer <SENTRY_TOKEN>" -H "Content-Type:application/json" -d " { \"version\":\"<version>\", \"refs\":[{ \"repository\":\"<rep/project>\", \"commit\":\"<commit>\", }], \"projects\":[\"<project_name>\"] }"

I’m getting code 404 without any response body.