Capture what providers actually send you, stand up the API that does not exist yet, and read the email your app tried to send — then chain all three into one run that asserts it worked.
No account needed to try it · Free plan · No card
{
"id": "evt_1P9x2K",
"type": "checkout.session.completed",
"data": {
"customer_email": "ada@example.com",
"amount_total": 4900,
"currency": "usd"
}
}Try it with a real URL — no account, nothing to install.
Built to work together
Replay a captured payload straight into a mock endpoint. Assert that the email your app sent actually arrived. The handoffs are the point — the shared dashboard is just where they live.
See exactly what they sent you
Point Stripe, GitHub, or any provider at a URL you own and inspect the payload the instant it lands — then replay it whenever you need it again.
Build against an API that does not exist yet
Define endpoints with generated data, conditional rules, and multi-step sequences, so your frontend is never blocked waiting on a backend team.
Test email without emailing customers
Point your app's SMTP config at MockLane and every message lands in a sandbox inbox instead of a real mailbox. Nothing escapes to a real recipient.
Scenarios
Chain the three together into one run: deliver a webhook, wait for your app to call back, check the email it sent. Every step carries assertions, and the run finishes green or red — so it can be the thing your CI depends on rather than a tab you keep open.
steps:
- type: send_webhook
url: "{{appUrl}}/webhooks/payment"
body: { event: payment.completed }
assert:
- status == 200
- type: wait_for_webhook
timeout_seconds: 10
assert:
- body.event == "payment.completed"
- type: wait_for_email
to: "{{customerEmail}}"
assert:
- subject contains "Payment confirmed"No surprises
Every quota is on the dashboard from the first day, not buried in a billing page you find after something breaks. Limits are limits — you get a 429 and a clear message, never an invoice you did not choose.
Endpoints
4
Captures today
128
Workspaces
2
Usage this month
Free · resets Oct 1
Benefits
One dashboard instead of a webhook inspector, a mocking tool, and a throwaway mailbox.
Unique URLs that accept any method and payload. Inspect headers, body, query params, and source IP in real time.
Status codes, headers, delays, and error simulation per endpoint. Match on path params or fall through to conditional rules.
Template responses with {{faker.email}}, {{faker.uuid}} and 119 more. Loop with repeat(), branch with oneOf().
Re-send any captured webhook with one click. Edit the payload first to reproduce edge cases on demand.
A real inbox address for testing signup and notification mail. Preview HTML, read headers, download attachments — customers never get hit.
Drop in a Swagger or OpenAPI spec and get working mock endpoints, then validate responses back against the schema.
Mock APIs
Static fixtures fall over the moment you need pagination, a 500, or a second call that returns something different. MockLane endpoints carry state, rules, and generated data — so the client you are building can be exercised properly.
121
data generators
5
scenario step types
<1 min
to first capture
{
"users": [
{{repeat(3)}}
{
"id": "{{faker.uuid}}",
"name": "{{faker.name}}",
"email": "{{faker.email}}",
"plan": {{oneOf("free","pro")}}
}
{{/repeat}}
]
}Free plan, no credit card, and nothing to install.
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