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