from $0.01 · paid with MPP

A callback URL your agent can buy and forget.

Choose 15 minutes, 2 hours, or 24 hours and create a private webhook inbox in one paid HTTP request. No signup, API key, public server, or monthly plan.

Build against the API How MPP works

Create an inbox

Tempo handles the 402 challenge and payment automatically.

# Tempo handles the MPP 402 challenge automatically.
tempo request https://hookmpp.dev/api/inboxes \
  -X POST

# → webhook_url, events_url, read_token, expires_at

THE WHOLE WORKFLOW

Pay once. Receive from anything.

Buy the endpoint

An MPP-aware agent chooses quick ($0.01), standard ($0.05), or extended ($0.20) and immediately receives an unguessable webhook URL plus a separate read token.

Hand it to any service

The webhook sender needs no wallet or MPP support. Ordinary POST, PUT, PATCH requests work as expected.

Poll privately

Read events with the bearer token and an incremental cursor. Storage disappears automatically at expiry.

15-minute TTL

Expiry is enforced by a durable alarm, even when idle.

25 events

Up to 65,536 bytes each and 1,048,576 bytes across the inbox.

Separate secrets

The delivery URL never grants permission to read events.

Deliver, then read

Keep the read token inside the purchasing agent; share only the webhook URL.

curl "$WEBHOOK_URL" \
  -H "content-type: application/json" \
  -d '{"job":"complete","asset":"https://…"}'

curl "$EVENTS_URL?after=0" \
  -H "authorization: Bearer $READ_TOKEN"