AsyncAPI Specification
generated: '2026-10-23'
method: searched
generator: extract-docs-artifacts.py (local)
source: https://developer.masv.io/api/webhooks/
sources:
- https://developer.masv.io/api/webhooks/
- https://help.massive.io/en/where-do-i-specify-the-email-on-which-i-want-to-receive-portal-delivery-notification
- https://help.massive.io/en/how-to-add-masv-notifications-to-slack
- https://help.massive.io/en/how-to-manage-masv-email-notifications
description: Webhooks are sent for successful actions in MASV.
events:
- event: package.created
description: Emitted when a package is created.
- event: package.finalized
description: Emitted when a package is finalized.
delivery:
auth: X-API-KEY header (API key) is required.
content_type: application/json; HTTPS endpoints must have a valid TLS 1.2 or 1.3 certificate.
note: HTTPS endpoints must use a valid TLS certificate; HTTP endpoints are not supported. The total size of URL + headers + extras + event payload
cannot exceed 128 KiB. Webhook endpoints must use HTTPS with a valid TLS certificate.
docs: https://developer.masv.io/api/webhooks/
Work with this as data
Every AsyncAPI spec here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for asyncapi
4 MCP tools reach this
find_asyncapisBrowse and filter every AsyncAPI spec in the catalog.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This AsyncAPI spec
curl "https://apis.io/api/v1/asyncapis/masv-inc-webhooks"
All asyncapi
curl "https://apis.io/api/v1/asyncapis?limit=25"
Discovery needs no key. Ratings and market analysis are Pro.
Get an API key
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.