the402 endpoint detail

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relay.preflightstack.com v1 file-slot

https://relay.preflightstack.com/v1/file-slot

needs params

Create a temporary public HTTPS download URL for an artifact generated by an agent or tool when the sending and receiving systems do not share storage. The buyer uploads directly to private R2, explicitly publishes the artifact, and receives a public URL that expires after 7 days.

Bazaar lists this endpoint, but when we called it we got HTTP 400 instead of a payment challenge.
Price
5000 atomic
Network
not established
Pay to
-
Spec dialect
-
Transport
-
HTTP method
POST
Response latency
202 ms
Payment options
0 usable of 0
Last checked
2026-09-06T01:12:45.208Z (37d ago)
Category
ai-inference

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Frelay.preflightstack.com%2Fv1%2Ffile-slot"