Burn Rate Monitor

#!/usr/bin/env bash

# Burn Rate Monitor Statusline for Claude Code
# Calculates real-time cost/minute and tokens/minute

# Read JSON from stdin
read -r input

# Extract values
total_cost=$(echo "$input" | jq -r '.cost.total_cost_usd // 0')
total_duration_ms=$(echo "$input" | jq -r '.cost.total_duration_ms // 1')
lines_added=$(echo "$input" | jq -r '.cost.total_lines_added // 0')
lines_removed=$(echo "$input" | jq -r '.cost.total_lines_removed // 0')

# Calculate duration in minutes (avoid division by zero)
if [ "$total_duration_ms" -gt 0 ]; then
  duration_minutes=$(echo "scale=2; $total_duration_ms / 60000" | bc)
else
  duration_minutes=0.01  # Prevent division by zero
fi

# Calculate burn rate (cost per minute)
if (( $(echo "$duration_minutes > 0" | bc -l) )); then
  cost_per_minute=$(echo "scale=4; $total_cost / $duration_minutes" | bc)
else
  cost_per_minute=0
fi

# Calculate total tokens (estimate: lines * 10 tokens per line avg)
total_tokens=$(( (lines_added + lines_removed) * 10 ))

# Calculate tokens per minute
if (( $(echo "$duration_minutes > 0" | bc -l) )); then
  tokens_per_minute=$(echo "scale=0; $total_tokens / $duration_minutes" | bc)
else
  tokens_per_minute=0
fi

# Project daily spend (assuming current burn rate for 24 hours)
if (( $(echo "$cost_per_minute > 0" | bc -l) )); then
  daily_projection=$(echo "scale=2; $cost_per_minute * 1440" | bc)  # 1440 minutes in 24 hours
else
  daily_projection=0
fi

# Color coding for burn rate alerts
if (( $(echo "$cost_per_minute > 0.10" | bc -l) )); then
  BURN_COLOR="\033[38;5;196m"  # Red: High burn rate (>$0.10/min)
elif (( $(echo "$cost_per_minute > 0.05" | bc -l) )); then
  BURN_COLOR="\033[38;5;226m"  # Yellow: Medium burn rate ($0.05-$0.10/min)
else
  BURN_COLOR="\033[38;5;46m"   # Green: Low burn rate (<$0.05/min)
fi

RESET="\033[0m"

# Format output
echo -e "${BURN_COLOR}🔥 Burn: \$${cost_per_minute}/min${RESET} | 📊 ${tokens_per_minute} tok/min | 📅 Daily: \$${daily_projection}"

{
  "format": "bash",
  "position": "left",
  "refreshInterval": 500
}