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Base Chain ID Lookup
x402
Base Chain ID Lookup is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Returns the Base mainnet chain ID in integer, hex, and CAIP-2 format via eth_chainId, confirming which EVM network you are connected to.
Price / call$0.001
Success—
StatusUnknown
How this service works
Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.
Output
Returns a JSON object with three fields: chain_id (integer, e.g. 8453), chain_id_hex (hex string, e.g. '0x2105'), and caip2 (CAIP-2 identifier string, e.g. 'eip155:8453') for the Base mainnet network.
Example use cases
Pre-transaction network sanity check
“Before my agent sends that USDC transfer, double-check that we're actually connected to Base mainnet — what is the chain ID right now?”
Wallet config for Base integration
“I'm setting up a new wallet integration for Base mainnet — what are the chain ID values I need, including the hex format and CAIP-2 identifier?”
Multi-chain agent network guard
“My agent is about to sign a contract interaction — verify we're on Base mainnet and not accidentally on testnet or another chain, and give me the chain ID in all formats.”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/chain-id?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or automated system needs to programmatically confirm it is connected to Base mainnet before executing transactions, signing messages, or configuring wallets — especially in multi-chain environments where network confusion could cause fund loss. Prefer this over manual RPC calls when you need all three chain ID formats (integer, hex, CAIP-2) in one response.
Side effects
- RPC connectivity issues may return a 5xx error if the Base node is unreachable
- Malformed request body may return a 400 validation error
- Payment failure (x402) may block the call if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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