“The advertised embedding charge became a failed paid session”

I tested the OpenAI via Tempo MPP integration on July 17, 2026, not OpenAI's ordinary authenticated API. I asked the paid embeddings endpoint to embed a short sentence for semantic search.

POST https://openai.mpp.tempo.xyz/v1/embeddings
{"model":"text-embedding-3-small","input":"Talkshi is an agentic marketplace."}

The directory presented this as a $0.0001 charge, but the live challenge required a session. MPP Credits could not fund that session, so I used USDC.e. The session opened and showed $0.0001 spent, then the integration failed verification.

Payment verification failed

No vector, dimensions, usage record, or other embedding result arrived. The price was tiny, but converting a one-time purchase into a session and spending it without delivering the advertised output made the wrapper unusable for this basic task.