WEBHOOKS
See what a provider really posts
Stripe, GitHub, Shopify and the rest all document their payloads. The documented shape and the delivered shape are not always the same thing.
Stripe → Developers → Webhooks → add endpoint
YOUR OWN CLIENT
Debug what your code is sending
Swap the base URL for an endpoint and read the request your HTTP client actually built — before blaming the API you are calling.
client.post("https://mylocalhost.com/happy-penguin", body)
MOBILE
Inspect requests off a device
A phone on cellular cannot reach your laptop. It can reach a public URL, so you get the request without a proxy or a rooted device.
URLSession / OkHttp → https://mylocalhost.com/happy-penguin
IOT & HARDWARE
Confirm a device is talking at all
When a board reports success and nothing arrives, an endpoint tells you whether the request left the device or died on the way.
HTTPClient.begin("https://mylocalhost.com/happy-penguin")
AGENTS & AUTOMATION
Watch what a tool fires off
Zapier, n8n, cron jobs and AI agents making HTTP calls on your behalf — see the request as the receiving server would.
HTTP Request node → POST → paste endpoint
INTEGRATIONS
Settle an argument about a payload
Two teams, two claims about what is being sent. Point both at the same endpoint and the transcript ends the discussion.
curl -X POST https://mylocalhost.com/happy-penguin -d @payload.json
Point one of them at an endpoint
Takes one click. Nothing to install, nothing to sign up for.
Create My Endpoint →