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Sardis supports multiple EVM-compatible blockchain networks, enabling flexible deployment across low-cost L2s and high-liquidity mainnets.

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Overview

Sardis provides native support for 6 mainnet chains and 5 testnet environments, with intelligent chain routing and automatic RPC failover.
ChainChain IDTypeNative TokenBlock Time
Base8453MainnetETH2s
Polygon137MainnetMATIC2s
Ethereum1MainnetETH12s
Arbitrum42161MainnetETH1s
Optimism10MainnetETH2s
Arc Testnet5042002TestnetUSDC0.5s

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Mainnet Chains

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Base

Chain ID: 8453 RPC Endpoints (with automatic fallback):
  • Primary: https://mainnet.base.org
  • Fallback: https://base-mainnet.public.blastapi.io
  • Fallback: https://base.llamarpc.com
Block Explorer: https://basescan.org Gas Configuration:
  • Max Gas Price: 100 gwei
  • Max Transaction Cost: $10 USD
  • Typical Gas Price: 0.001-0.01 gwei
Supported Tokens: USDC, EURC Best For: Low-cost transactions, high throughput agent operations Configuration (packages/sardis-chain/src/sardis_chain/config.py:401-413): 
chains["base"] = ChainConfig(
    chain_id=8453,
    name="base",
    display_name="Base",
    block_time_seconds=2.0,
    confirmations_required=1,
    max_gas_price_gwei=Decimal("100"),
)

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Polygon

Chain ID: 137 RPC Endpoints:
  • Primary: https://polygon-rpc.com
  • Fallback: https://polygon-mainnet.public.blastapi.io
  • Fallback: https://polygon.llamarpc.com
Block Explorer: https://polygonscan.com Gas Configuration:
  • Max Gas Price: 1000 gwei
  • Max Transaction Cost: $20 USD
  • Typical Gas Price: 30-100 gwei
Supported Tokens: USDC, USDT, EURC Best For: High token availability, multi-token operations

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Ethereum

Chain ID: 1 RPC Endpoints:
  • Primary: https://eth.llamarpc.com
  • Fallback: https://ethereum-rpc.publicnode.com
  • Fallback: https://eth.drpc.org
Block Explorer: https://etherscan.io Gas Configuration:
  • Max Gas Price: 1000 gwei
  • Max Transaction Cost: $100 USD
  • Typical Gas Price: 15-50 gwei
Supported Tokens: USDC, USDT, PYUSD, EURC Best For: Maximum liquidity, enterprise-grade security

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Arbitrum

Chain ID: 42161 RPC Endpoints:
  • Primary: https://arb1.arbitrum.io/rpc
  • Fallback: https://arbitrum-one-rpc.publicnode.com
  • Fallback: https://arbitrum.llamarpc.com
Block Explorer: https://arbiscan.io Gas Configuration:
  • Max Gas Price: 100 gwei
  • Max Transaction Cost: $10 USD
  • Typical Gas Price: 0.1-0.5 gwei
Supported Tokens: USDC, USDT Best For: Ultra-low latency (1s blocks), high-frequency operations

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Optimism

Chain ID: 10 RPC Endpoints:
  • Primary: https://mainnet.optimism.io
  • Fallback: https://optimism-rpc.publicnode.com
  • Fallback: https://optimism.llamarpc.com
Block Explorer: https://optimistic.etherscan.io Gas Configuration:
  • Max Gas Price: 100 gwei
  • Max Transaction Cost: $10 USD
  • Typical Gas Price: 0.001-0.01 gwei
Supported Tokens: USDC, USDT Best For: OP Stack ecosystem integration, low-cost transfers

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Arc Testnet (Circle L1)

Chain ID: 5042002 RPC Endpoints:
  • Primary: https://rpc.testnet.arc.network
  • Fallback: https://rpc.blockdaemon.testnet.arc.network
  • Fallback: https://rpc.drpc.testnet.arc.network
Block Explorer: https://testnet.arcscan.app Gas Configuration:
  • Native Gas Token: USDC (first USDC-native chain)
  • Max Transaction Cost: $1000 USD
  • Typical Gas Price: Sub-cent
Supported Tokens: USDC, EURC Best For: Testing USDC-native gas payments, Circle ecosystem integration Unique Features:
  • Pay gas fees in USDC (no need for native ETH)
  • Ultra-fast blocks (0.5s)
  • Built by Circle for stablecoin infrastructure

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Testnet Chains

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Base Sepolia

Chain ID: 84532
RPC: https://sepolia.base.org
Explorer: https://sepolia.basescan.org
Faucet: https://docs.base.org/tools/network-faucets

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Polygon Amoy

Chain ID: 80002
RPC: https://rpc-amoy.polygon.technology
Explorer: https://amoy.polygonscan.com

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Ethereum Sepolia

Chain ID: 11155111
RPC: https://rpc.sepolia.org
Explorer: https://sepolia.etherscan.io

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Arbitrum Sepolia

Chain ID: 421614
RPC: https://sepolia-rollup.arbitrum.io/rpc
Explorer: https://sepolia.arbiscan.io

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Optimism Sepolia

Chain ID: 11155420
RPC: https://sepolia.optimism.io
Explorer: https://sepolia-optimism.etherscan.io

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Chain Selection Best Practices

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By Use Case

High-Frequency Microtransactions (< $10)
  • Best: Base, Optimism, Arbitrum
  • Why: Sub-cent gas fees, fast finality
Large Transfers (> $10,000)
  • Best: Ethereum
  • Why: Maximum liquidity, security, decentralization
Multi-Token Operations
  • Best: Polygon, Ethereum
  • Why: Broadest token support (USDC, USDT, EURC, PYUSD)
Agent Testing
  • Best: Arc Testnet, Base Sepolia
  • Why: USDC-native gas (Arc), fastest Base testnet

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Gas Cost Comparison

ERC-20 Transfer (65,000 gas):
ChainGas PriceCost (USD)Time
Base0.003 gwei$0.00016s
Optimism0.003 gwei$0.00016s
Arbitrum0.2 gwei$0.0013s
Polygon50 gwei$0.0036s
Ethereum25 gwei$0.0536s

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Environment-Specific Routing

Sardis automatically routes transactions based on environment configuration: 
from sardis_v2_core.config import load_settings

settings = load_settings()

# Default chains by environment
if settings.environment == "dev":
    default_chain = "base_sepolia"  # Testnet
elif settings.environment == "sandbox":
    default_chain = "arc_testnet"  # Circle's L1 testnet
else:  # production
    default_chain = "base"  # Mainnet
Configuration (packages/sardis-core/src/sardis_v2_core/config.py:245-260): 
chains: List[ChainConfig] = Field(default_factory=lambda: [
    ChainConfig(
        name="base_sepolia",
        rpc_url="https://sepolia.base.org",
        chain_id=84532,
        stablecoins=["USDC"],
    ),
    ChainConfig(
        name="base",
        rpc_url="https://mainnet.base.org",
        chain_id=8453,
        stablecoins=["USDC", "EURC"],
    ),
])

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Custom RPC Configuration

Override default RPC endpoints via environment variables: 
# Chain-specific RPC override
BASE_RPC_URL="https://your-custom-base-rpc.com"
ETHEREUM_RPC_URL="https://your-infura-endpoint.io/v3/YOUR_KEY"

# Or with SARDIS_ prefix
SARDIS_BASE_RPC_URL="https://your-custom-base-rpc.com"
Sardis automatically prefers custom RPCs while maintaining fallback support: 
# Custom RPC takes priority, but fallbacks remain active
endpoints = [
    RPCEndpointConfig(url=custom_rpc, priority=0),
    RPCEndpointConfig(url="https://mainnet.base.org", priority=1),
    RPCEndpointConfig(url="https://base.llamarpc.com", priority=2),
]
Implementation (packages/sardis-chain/src/sardis_chain/config.py:310-333).

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RPC Health & Failover

Sardis includes production-grade RPC management: Health Checks:
  • Automatic endpoint health monitoring every 60s
  • 3 consecutive failures trigger failover
  • Weighted round-robin for load distribution
Retry Logic:
  • Max 3 retries per endpoint
  • 1s delay between retries
  • Automatic fallback to next endpoint
Timeout Handling:
  • Default: 30s per RPC call
  • Configurable per-endpoint
  • Transaction-specific timeouts
Configuration (packages/sardis-chain/src/sardis_chain/config.py:88-103): 
@dataclass
class RPCEndpointConfig:
    url: str
    priority: int = 0
    timeout_seconds: float = 30.0
    max_retries: int = 3
    retry_delay_seconds: float = 1.0
    health_check_interval_seconds: float = 60.0
    max_consecutive_failures: int = 3

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Chain Validation

Sardis validates chain IDs at runtime to prevent fund loss from misconfiguration: 
from sardis_chain.config import validate_chain_id, CHAIN_ID_MAP

# Validate received chain ID matches expected
if not validate_chain_id("base", received_chain_id):
    raise SecurityError("Chain ID mismatch - wrong network!")

# Chain ID mapping
CHAIN_ID_MAP = {
    "ethereum": 1,
    "base": 8453,
    "polygon": 137,
    "arbitrum": 42161,
    "optimism": 10,
    "arc_testnet": 5042002,
}
Implementation (packages/sardis-chain/src/sardis_chain/config.py:574-594).

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Next Steps

Supported Tokens

Token addresses and configurations per chain

Gas Optimization

Strategies for minimizing transaction costs

Smart Contracts

Policy enforcement and paymaster contracts

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