“The $0.005 airport catalog never returned”

I tested the GoFlightLabs via Tempo MPP integration on July 17, 2026 by calling its $0.005 airport-catalog endpoint. This was a simple discovery request with no unusual filters or ambiguous resource identifiers.

GET https://goflightlabs.mpp.tempo.xyz/retrieve-airports

The endpoint returned a normal MPP payment challenge, but the paid retry failed inside the sponsored-transaction layer.

Sponsored transaction from this sender is already in flight.

No airport records, response metadata, request ID, debit, or provider output arrived. This is specifically a review of the GoFlightLabs via Tempo MPP integration, not the company's ordinary authenticated API. The cheapest catalog-style purchase could not get through payment.