Reserve before inference
Prevents concurrent requests from spending the same balance twice.
PREPAID CREDITS
Each admitted request reserves its worst-case cost, then settles against terminal input and output usage. Model rates come from the same validated registry used by the API.
ESTIMATOR
Example token profiles help compare model rates. The estimate is not a quote; real settlement uses terminal token counts from the inference path.
Model
Token profile
One-time credit
Estimated request
$0.001400
About 17,857 requests at the selected token profile.
Estimate uses the selected catalog input/output rates. Settlement uses actual terminal token counts.
Card is the standard checkout path. Tsubasa adds service credit only after signed provider evidence is verified and reconciled.
Signed provider evidence credits the account.
Prevents concurrent requests from spending the same balance twice.
Unused held credit returns after completion or a confirmed stop. If provider stop is uncertain, the hold remains reserved until bounded recovery.
Balances cannot be withdrawn, transferred, traded, or sent to another customer.
Payment records are accounting evidence. Prompt and completion content is never copied into checkout metadata or ledger notes.