the402 endpoint detail

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stumble.vimabrosta.com v1 inbox

https://stumble.vimabrosta.com/v1/inbox

answers 402

Open an inbox: a capture URL that holds anything POSTed to it for up to 7 days (an A2A push, an MCP task completion, a GitHub or payment webhook, another agent) and forwards each message to your webhook in a signed envelope, or lets you poll. The durable recipient a finished session cannot be. Up to 200 messages of 64KB, optional shared-secret header. One-time $0.10.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.10
Network
base
Pay to
0xd63e74bCB00757C8fDb1817F1558ed8b97C608b6
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
309 ms
Payment options
3 usable of 3
Last checked
2026-09-06T01:19:09.589Z (35d ago)
Category
ai-inference

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fstumble.vimabrosta.com%2Fv1%2Finbox"