Here is a list of checked repositories for v0.3.3:
[warn]
[warn] Note: Some unresolved dependencies have extra attributes. Check that these dependencies exist with the requested attributes.
[warn] org.scalameta:sbt-native-image:0.3.3 (sbtVersion=1.0, scalaVersion=2.12)
[warn]
[warn] Note: Unresolved dependencies path:
[error] sbt.librarymanagement.ResolveException: Error downloading org.scalameta:sbt-native-image;sbtVersion=1.0;scalaVersion=2.12:0.3.3
[error] Not found
[error] Not found
[error] not found: https://repo1.maven.org/maven2/org/scalameta/sbt-native-image_2.12_1.0/0.3.3/sbt-native-image-0.3.3.pom
[error] not found: /home/andriy/.ivy2/local/org.scalameta/sbt-native-image/scala_2.12/sbt_1.0/0.3.3/ivys/ivy.xml
[error] not found: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/org.scalameta/sbt-native-image/scala_2.12/sbt_1.0/0.3.3/ivys/ivy.xml
[error] not found: https://repo.typesafe.com/typesafe/ivy-releases/org.scalameta/sbt-native-image/scala_2.12/sbt_1.0/0.3.3/ivys/ivy.xml
Currently I'm using it for the examples project of jsoniter-scala and it works fine for v0.3.2.
Here is a list of checked repositories for v0.3.3: