BerriAI/litellm · warning · HTTPException

Discount for {provider} must be between 0 and 1 (0% to 100%)

Error message

Discount for {provider} must be between 0 and 1 (0% to 100%)

What it means

Validation error (HTTP 400) from PATCH /config/cost_discount_config: each discount must satisfy 0 <= discount <= 1, where 1 means a 100% discount. Values outside that range (negative, or > 1 like 10 meaning '10%') are rejected.

Source

Thrown at litellm/proxy/management_endpoints/cost_tracking_settings.py:231

    invalid_providers: Final = []
    for provider in cost_discount_config:
        if provider not in LlmProvidersSet:
            invalid_providers.append(provider)

    if invalid_providers:
        raise HTTPException(
            status_code=400,
            detail={
                "error": f"Invalid provider(s): {', '.join(invalid_providers)}. Must be valid LiteLLM providers. See https://docs.litellm.ai/docs/providers for the full list."
            },
        )

    # Validate discount values are between 0 and 1
    for provider, discount in cost_discount_config.items():
        if not isinstance(discount, (int, float)):
            raise HTTPException(status_code=400, detail=f"Discount for {provider} must be a number")
        if not (0 <= discount <= 1):
            raise HTTPException(
                status_code=400,
                detail=f"Discount for {provider} must be between 0 and 1 (0% to 100%)",
            )

    try:
        # Load existing config
        config: Final = await proxy_config.get_config()

        # Ensure litellm_settings exists
        if "litellm_settings" not in config:
            config["litellm_settings"] = {}

        # Update cost_discount_config
        config["litellm_settings"]["cost_discount_config"] = cost_discount_config

        # Save the updated config to DB
        await proxy_config.save_config(new_config=config)

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Convert percentages to decimals: 10% -> 0.10, 50% -> 0.5.
2. Ensure the value is >= 0 and <= 1.
3. Double-check upstream config tooling doesn't multiply/divide by 100.

Example fix

# before
{"openai": 10}   # 400 must be between 0 and 1

# after
{"openai": 0.10}

for provider, discount in cost_discount_config.items():
    if not (0 <= discount <= 1):
        raise ValueError(
            f"{provider}: discount {discount} outside [0,1]; express 10% as 0.10"
        )

When it happens

Trigger: Sending whole-percent values (10 for 10%) instead of the decimal fraction 0.10; sending a negative discount; sending 1.5 thinking it means 150% off.

Common situations: Misreading the units — the API uses fractional multipliers, not percent; porting configs from systems that express percent as integers.

Understand the failure class

Background: "value must be between 0 and 1" / "out of range" / "must not be negative" errors: fixing range-validation failures across open-source libraries — this error's family across 42 libraries.

Related errors

• Margin percentage for {provider} must be between 0 and 10 (0
• Fixed margin amount for {provider} must be non-negative
• Invalid provider(s): {', '.join(invalid_providers)}. Must be
• Discount for {provider} must be a number
• Invalid provider(s): {', '.join(invalid_providers)}. Must be

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/8fe28e43c3f9f4c9. Report an issue: GitHub.