People about to receive arrest warrants are not warned or threatened in advance. They are not told that sending money will stop the warrant server.
If you were threatened with an "arrest warrant" via a phone call or email, read this:
"The warrant is phony. A valid warrant would not be served by fax or e-mail. It would be served in person by a U.S. Marshal or other law enforcement officer."
"Anyone receiving a fake arrest warrant should contact the FBI or the district U.S. Marshals Office. If there is any question regarding the authenticity of a warrant, contact your district clerk of court."