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When publishing a message, you can delay it for a certain amount of time before it will be delivered to your API. See the pricing table for more information

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Relative Delay

Delay a message by a certain amount of time relative to the time the message was published. The format for the duration is <number><unit>. Here are some examples:
  • 10s = 10 seconds
  • 1m = 1 minute
  • 30m = half an hour
  • 2h = 2 hours
  • 7d = 7 days
You can send this duration inside the Upstash-Delay header. 
curl -XPOST \
    -H 'Authorization: Bearer XXX' \
    -H "Content-type: application/json" \
    -H "Upstash-Delay: 1m" \
    -d '{ "hello": "world" }' \
    'https://qstash.upstash.io/v2/publish/https://my-api...'
Upstash-Delay will get overridden by Upstash-Not-Before header when both are used together.

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Absolute Delay

Delay a message until a certain time in the future. The format is a unix timestamp in seconds, based on the UTC timezone. You can send the timestamp inside the Upstash-Not-Before header. 
curl -XPOST \
    -H 'Authorization: Bearer XXX' \
    -H "Content-type: application/json" \
    -H "Upstash-Not-Before: 1657104947" \
    -d '{ "hello": "world" }' \
    'https://qstash.upstash.io/v2/publish/https://my-api...'
Upstash-Not-Before will override the Upstash-Delay header when both are used together.

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Delays in Schedules

Adding a delay in schedules is only possible via via Upstash-Delay. The delay will affect the messages that will be created by the schedule and not the schedule itself. For example when you create a new schedule with a delay of 30s, the messages will be created when the schedule triggers but only delivered after 30 seconds.