The actual running of a job is called an execution. A job is not billed for individual executions. For instance if a single job is defined to run every day of the month then the job is billed $01/month and not $3/month for 30 executions of that single job. if you have 1 job running every day for 6 months you will be charged $0.6/month.
The pricing is based per account and not per project.
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