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fix: refund users when model returns zero tokens with non-zero cost #489

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fix: refund users when model returns zero tokens with non-zero cost #489

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12 changes: 11 additions & 1 deletion routstr/payment/cost_calculation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -180,7 +180,17 @@ def parse_token_count(value: object) -> int:
input_msats = int(cost_in_msats * input_ratio)
output_msats = cost_in_msats - input_msats
else:
output_msats = cost_in_msats
# No tokens reported — model produced empty output, issue full refund
logger.warning(
"Zero tokens with non-zero USD cost — issuing full refund",
extra={
"usd_cost": usd_cost,
"model": response_data.get("model", "unknown"),
},
)
input_msats = 0
output_msats = 0
cost_in_msats = 0

logger.info(
"Using cost from usage data/details",
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