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Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/get-optimal-gas-from-api.sh

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+#!/usr/bin/env bash
+# Get Optimal Gas Price from Etherscan Gas API
+# Provides Safe, Proposed, and Fast gas prices
+# Usage: ./get-optimal-gas-from-api.sh [speed] [chain_id]
+# Speed: safe, proposed, fast (default: proposed)
+# Chain ID: 1 for Ethereum Mainnet (default: uses RPC chain)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+# Load environment variables
+if [ -f "$PROJECT_ROOT/.env" ]; then
+    source "$PROJECT_ROOT/.env"
+elif [ -f "$PROJECT_ROOT/../.env" ]; then
+    source "$PROJECT_ROOT/../.env"
+fi
+
+# Configuration
+SPEED="${1:-proposed}"  # safe, proposed, fast
+CHAIN_ID="${2:-}"
+RPC_URL="${RPC_URL_138:-http://192.168.11.250:8545}"
+
+# Get chain ID from RPC if not provided
+if [ -z "$CHAIN_ID" ]; then
+    CHAIN_ID=$(cast chain-id --rpc-url "$RPC_URL" 2>/dev/null || echo "1")
+fi
+
+# Etherscan API endpoints by chain
+declare -A ETHERSCAN_APIS=(
+    ["1"]="https://api.etherscan.io/api"
+    ["56"]="https://api.bscscan.com/api"
+    ["137"]="https://api.polygonscan.com/api"
+    ["43114"]="https://api.snowtrace.io/api"
+    ["8453"]="https://api.basescan.org/api"
+    ["42161"]="https://api.arbiscan.io/api"
+    ["10"]="https://api-optimistic.etherscan.io/api"
+)
+
+# Get API endpoint
+API_ENDPOINT="${ETHERSCAN_APIS[$CHAIN_ID]:-}"
+if [ -z "$API_ENDPOINT" ]; then
+    # Fallback to RPC gas price for unsupported chains
+    GAS_PRICE=$(cast gas-price --rpc-url "$RPC_URL" 2>/dev/null || echo "1000000000")
+    echo "$GAS_PRICE"
+    exit 0
+fi
+
+# Get API key (optional, works without it but with rate limits)
+API_KEY="${ETHERSCAN_API_KEY:-}"
+
+# Build API URL
+if [ -n "$API_KEY" ]; then
+    API_URL="${API_ENDPOINT}?module=gastracker&action=gasoracle&apikey=${API_KEY}"
+else
+    API_URL="${API_ENDPOINT}?module=gastracker&action=gasoracle"
+fi
+
+# Fetch gas prices from API
+GAS_DATA=$(curl -s "$API_URL" 2>/dev/null || echo "")
+
+if [ -z "$GAS_DATA" ]; then
+    # Fallback to RPC gas price
+    GAS_PRICE=$(cast gas-price --rpc-url "$RPC_URL" 2>/dev/null || echo "1000000000")
+    echo "$GAS_PRICE"
+    exit 0
+fi
+
+# Parse gas price based on speed
+case "$SPEED" in
+    safe)
+        GAS_PRICE_GWEI=$(echo "$GAS_DATA" | grep -oE '"SafeGasPrice":"[0-9.]+"' | cut -d'"' -f4 || echo "")
+        ;;
+    proposed)
+        GAS_PRICE_GWEI=$(echo "$GAS_DATA" | grep -oE '"ProposeGasPrice":"[0-9.]+"' | cut -d'"' -f4 || echo "")
+        ;;
+    fast)
+        GAS_PRICE_GWEI=$(echo "$GAS_DATA" | grep -oE '"FastGasPrice":"[0-9.]+"' | cut -d'"' -f4 || echo "")
+        ;;
+    *)
+        GAS_PRICE_GWEI=$(echo "$GAS_DATA" | grep -oE '"ProposeGasPrice":"[0-9.]+"' | cut -d'"' -f4 || echo "")
+        ;;
+esac
+
+# Convert Gwei to Wei
+if [ -n "$GAS_PRICE_GWEI" ] && [ "$GAS_PRICE_GWEI" != "0" ]; then
+    # Convert decimal Gwei to Wei (multiply by 1e9)
+    GAS_PRICE=$(echo "scale=0; $GAS_PRICE_GWEI * 1000000000 / 1" | bc 2>/dev/null || echo "")
+    
+    if [ -n "$GAS_PRICE" ] && [ "$GAS_PRICE" != "0" ]; then
+        echo "$GAS_PRICE"
+        exit 0
+    fi
+fi
+
+# Fallback to RPC gas price
+GAS_PRICE=$(cast gas-price --rpc-url "$RPC_URL" 2>/dev/null || echo "1000000000")
+echo "$GAS_PRICE"
+