Parallel Web Systems Webhooks

generated: '2026-07-20'
method: searched
source: https://docs.parallel.ai/resources/webhook-setup
type: Webhooks
spec: standard-webhooks
transport: https-post-json
description: >-
  Parallel delivers real-time webhook notifications when events occur in Task, FindAll,
  and Monitor operations, removing the need to poll. Subscriptions select events via an
  `event_types` array configured in Settings -> Webhooks.
signing:
  spec: Standard Webhooks
  algorithm: HMAC-SHA256
  encoding: base64-rfc4648-padded
  signed_content: '<webhook-id>.<webhook-timestamp>.<payload>'
  headers:
  - name: webhook-id
    purpose: Unique event identifier.
  - name: webhook-timestamp
    purpose: Unix timestamp in seconds.
  - name: webhook-signature
    purpose: Versioned signature(s), format 'v1,<base64 signature>'.
  secret:
    prefix: whsec_
    detail: Base64-decode the secret after stripping the whsec_ prefix to obtain the HMAC key.
event_families:
- family: Task API
  detail: Task run lifecycle/completion events.
- family: FindAll
  detail: Candidate and run events.
- family: Monitor API
  detail: Monitor events and completions.
notes: >-
  Provider documents webhooks but ships no AsyncAPI document, so this captures the webhook
  catalog (type Webhooks). Streaming progress is also available as Server-Sent Events on the
  per-resource /events endpoints in the OpenAPI. No fabricated event names - families are as
  documented; exact per-API event_type strings live in each API's reference page.