From 6b9917c0bd167877204672ffd9d4c63327313382 Mon Sep 17 00:00:00 2001
From: Shroominic <db2002dominic@gmail.com>
Date: Wed, 24 Dec 2025 12:08:39 +0100
Subject: [PATCH] max cost filtered models

---
 routstr/payment/models.py | 85 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 82 insertions(+), 3 deletions(-)

diff --git a/routstr/payment/models.py b/routstr/payment/models.py
index d6eccf5d..24cb0c1f 100644
--- a/routstr/payment/models.py
+++ b/routstr/payment/models.py
@@ -3,14 +3,15 @@
 import random
 
 import httpx
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Request
 from pydantic.v1 import BaseModel
 from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
 
-from ..core.db import ModelRow, create_session, get_session
+from ..core.db import ApiKey, ModelRow, create_session, get_session
 from ..core.logging import get_logger
 from ..core.settings import settings
+from ..wallet import deserialize_token_from_string
 from .price import sats_usd_price
 
 logger = get_logger(__name__)
@@ -521,11 +522,89 @@ def _pricing_matches(
     return True
 
 
+
+async def _get_request_balance(request: Request, session: AsyncSession) -> int | None:
+    """Get the balance from the request headers if authentication is provided."""
+    headers = request.headers
+    token: str | None = None
+
+    if x_cashu := headers.get("x-cashu"):
+        token = x_cashu
+    elif auth := headers.get("authorization"):
+        parts = auth.split(" ")
+        if len(parts) > 1:
+            token = parts[1]
+
+    if not token:
+        return None
+
+    # Handle API keys (sk-*)
+    if token.startswith("sk-"):
+        try:
+            # sk- keys use the part after "sk-" as the ID
+            key_id = token[3:]
+            key = await session.get(ApiKey, key_id)
+            if key:
+                return key.balance - key.reserved_balance
+        except Exception as e:
+            logger.warning(f"Error checking API key balance: {e}")
+        return None
+
+    # Handle Cashu tokens
+    try:
+        token_obj = deserialize_token_from_string(token)
+        amount_msat = (
+            token_obj.amount if token_obj.unit == "msat" else token_obj.amount * 1000
+        )
+        return amount_msat
+    except Exception as e:
+        logger.debug(f"Failed to deserialize cashu token for balance check: {e}")
+        return None
+
+
 @models_router.get("/v1/models")
 @models_router.get("/models", include_in_schema=False)
-async def models(session: AsyncSession = Depends(get_session)) -> dict:
+async def models(
+    request: Request, session: AsyncSession = Depends(get_session)
+) -> dict:
     """Get all available models from all providers with database overrides applied."""
     from ..proxy import get_unique_models
 
     items = get_unique_models()
+    
+    # Optional: Filter by user balance if authenticated
+    user_balance = await _get_request_balance(request, session)
+    if user_balance is not None:
+        filtered_items = []
+        
+        # Calculate tolerance factor once
+        tol_factor = 1.0
+        if not settings.fixed_pricing and settings.tolerance_percentage > 0:
+            tol_factor = 1.0 - (settings.tolerance_percentage / 100.0)
+            
+        fixed_cost = settings.fixed_cost_per_request * 1000
+        min_cost = settings.min_request_msat
+
+        for model in items:
+            model_cost_msats = 0
+            
+            if settings.fixed_pricing:
+                model_cost_msats = max(min_cost, fixed_cost)
+            elif model.sats_pricing:
+                # Use model specific pricing
+                max_cost = (
+                    model.sats_pricing.max_cost
+                    * 1000
+                    * tol_factor
+                )
+                model_cost_msats = max(min_cost, int(max_cost))
+            else:
+                # Fallback if no pricing found
+                model_cost_msats = max(min_cost, fixed_cost)
+            
+            if model_cost_msats <= user_balance:
+                filtered_items.append(model)
+        
+        items = filtered_items
+
     return {"data": items}