create_alert_rule_example.py

import requests

url = "https://sentry.io/api/0/projects/<ORG_SLUG_HERE>/<PROJECT_SLUG_HERE>/rules/"

payload = "{\"environment\":null,\"actionMatch\":\"all\",\"frequency\":\"30\",\"name\":\"API Alert Example\",\"conditions\":[{\"name\":\"An event is first seen\",\"id\":\"sentry.rules.conditions.first_seen_event.FirstSeenEventCondition\"},\n{\"interval\":\"1h\",\"name\":\"An event is seen more than 50 times in 1h\",\"value\":50,\"id\":\"sentry.rules.conditions.event_frequency.EventFrequencyCondition\"}],\"id\":\"412675\",\"actions\":[{\"name\":\"Send a notification (for all legacy integrations)\",\"id\":\"sentry.rules.actions.notify_event.NotifyEventAction\"},{\"channel_id\":\"CA6MX2DE2\",\"name\":\"Send a notification to the vu Slack workspace to #ember-errors and show tags [] in notification\",\"workspace\":\"1305\",\"tags\":\"\",\"id\":\"sentry.integrations.slack.notify_action.SlackNotifyServiceAction\",\"channel\":\"#ember-errors\"}]}"
headers = {
    'Content-Type': "application/json",
    'Authorization': "Bearer <API_TOKEN_HERE>"
}

response = requests.request("POST", url, data=payload, headers=headers)

print(response.text)