Send and debug webhooks — applications, endpoints, messages, delivery attempts and replays. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Svix connector, then ask in plain words. The AI picks the tools.
For developers who send webhooks to their own customers with Svix.
The AI lists the recent messages of a customer application and every delivery attempt for one message, with status, response code and response body.
The AI reads an endpoint's counts of success, pending, sending and fail, and lists its delivery attempts filtered by status to find the failures.
The AI lists the event types and reads one with its description and JSON schema. You can also see which types an endpoint is subscribed to.
The AI queues one message for redelivery to one endpoint, or replays all failed messages of an endpoint since a time. It then follows the background task.
Changes dataThe AI creates an application for a new customer and registers an endpoint URL for it, optionally limited to chosen event types and channels.
Changes dataThe AI sends a message with an event type to every endpoint of an application that subscribes to it. This delivers real traffic to your customers' URLs.
Changes dataThe login page asks for your Svix API key.
Create one in the Svix dashboard → API Access. Your token is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"svix": {
"url": "https://svix.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"svix": {
"type": "http",
"url": "https://svix.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Svix API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+ | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Svix server only. Ask your AI to run svix_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with svix_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with svix_upgrade before then undoes the cancel. Or write to [email protected].
svix_list_applicationssvix_get_applicationsvix_list_endpointssvix_get_endpointsvix_get_endpoint_statssvix_list_messagessvix_get_messagesvix_list_attempts_by_messagesvix_list_attempts_by_endpointsvix_list_endpoint_messagessvix_list_event_typessvix_get_event_typesvix_list_background_taskssvix_healthsvix_create_applicationsvix_create_endpointsvix_send_messagesvix_resend_messagesvix_recover_endpointsvix_usage_statussvix_request_featuresvix_upgradesvix_cancel_subscriptionFind out why a webhook did not arrive. Check if a customer endpoint is healthy. See which event types customers can subscribe to. Resend a message or replay failed ones. Add a customer application and a webhook endpoint. Send a webhook message to a customer. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Svix. The server calls the Svix API with your own Svix access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Svix API key. See Before you connect for where to find it.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Svix API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Svix API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Svix.
Yes, if you approve it. 5 of the 19 Svix tools can create or change data. The other 14 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Svix server only. Cancel any time: your paid plan then runs to the end of the paid period. Run svix_usage_status to see how many calls you used.
Ask the AI to run svix_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run svix_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with svix_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.