Local traffic workspace vs webhook event gateway
Hookdeck shines at ingest, filtering, and production-grade webhook infrastructure, including CLI MCP for Event Gateway resources. Mercur is the localhost workspace you open before staging — guest inspect, tunnel, retry, and hosted Remote MCP for local traffic.
Choose Mercur when the job is expose localhost, inspect what arrived, and iterate on a handler tonight.
Choose Hookdeck when you need a durable event gateway: queues, filters, transformations, and ops-grade delivery into production services.
How the jobs compare
| Job | Mercur | Hookdeck |
|---|---|---|
| Local webhook debugging | Guest tunnel from npx, with a request log | CLI + console |
| Production ingest / routing | Not the product | Core strength |
| Request inspection | Tunnel request history | Full event history |
| Replay | Manual retry | First-class replay tooling |
| Multi-protocol localhost | HTTP / WS / TCP (paid for WS/TCP) | HTTP webhook focus |
| IDE / agent inspect (MCP) | Hosted Remote MCP over OAuth for local traffic (Solo / Team) | CLI MCP (hookdeck gateway mcp) for Event Gateway |
| Inbound email testing | Temporary @mercur-mail.com inbox, optional JSON forward | Email through a provider webhook (Mailgun, SendGrid) |
Last verified: 3 September 2026. Competitor details change — verify on each vendor’s site.
Where Mercur is stronger
- A working localhost tunnel before you sign up for anything, let alone adopt a gateway
- One agent for HTTP plus WebSocket and TCP on paid plans
- Hosted Remote MCP for local endpoint request history and mailbox mail
- IP allowlists and in-flight request modifiers on Endpoints
- A mailbox that receives mail directly, without a mail provider in front of it
When Hookdeck wins
- Production webhook reliability (queueing, retries, filtering)
- Team workflows built around event pipelines
- CLI MCP for Event Gateway resources
- Path from local CLI into a lasting Event Gateway architecture
- Deeper ops tooling for high-volume ingest
Common questions
Is Mercur a Hookdeck alternative?
For local debugging and inspect-first tunnels, Mercur competes for the same developer moment. It is not a drop-in replacement for Hookdeck’s production event gateway.
Does Hookdeck support MCP?
Yes. The Hookdeck CLI runs an MCP server (`hookdeck gateway mcp`) for Event Gateway resources. Mercur’s Remote MCP is a different shape: a hosted Streamable HTTP server you authorize with OAuth (or a workspace API key), exposing read-only tools over local-traffic request history and mailbox mail rather than a production gateway.
Can Mercur queue webhooks when my laptop is offline?
No. If the agent disconnects, requests fail (HTTP 503 after a short grace). Mercur does not market a durable offline queue.
Does Mercur support replay?
Yes — manual retry from the console for stored requests, within plan retention limits. Hookdeck’s replay tooling is first-class for gateway events.
Related pages
Mercur vs ngrok
Mature localhost tunnel with a CLI, Traffic Inspector, replay, and an auto-assigned free-plan domain.
Read comparison →Mercur vs webhook.site
Instant payload bin with browser inspect and an email address per token. CLI forward (`whcli`) when you need localhost.
Read comparison →Mercur vs Hooklistener
Webhook URL + inspect product aimed at no-CLI, no-signup debugging (vendor-documented).
Read comparison →Mercur vs Cloudflare Tunnel
Mature edge tunnel with your Cloudflare account and domain — not a webhook console.
Read comparison →Try Mercur on a real webhook
Get a public HTTPS URL and inspect the payload in the browser, or run npx @mercur_dev/cli http 3000 to forward it to localhost without an account. Register when you want a stable endpoint.