Tools / Crypto & Base
Address Type $0.001 / call
Is a Base address a contract or a wallet?
GET /v1/base/contractDetermines whether a Base address is a smart contract or an externally-owned account (a normal wallet), with the bytecode size and an explorer link.
Parameters
address required | Base address to check |
Example
macOS / Linuxcurl -s "https://quartermaster.surewhynot.app/v1/base/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"curl.exe -s "https://quartermaster.surewhynot.app/v1/base/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"Unpaid, these return 402 Payment Required with the payment details in the header (add -i to see them). curl.exe ships with Windows 10+ and works in cmd and both PowerShell versions. To actually pay, use an x402 client (see Connect) or call it as the MCP tool. Cost: $0.001 per call.
FAQ
Why would an agent care?
Knowing whether an address is a contract changes how you interact with it and can flag a payment destination that isn't a plain wallet.
How do I pay for this endpoint?
Call it with no payment and you receive HTTP 402 with machine-readable payment requirements. Attach a USDC payment on Base with any x402 client (for example @x402/fetch) and retry — the whole loop is two requests. This call costs $0.001 in USDC.
Do I need an account or API key?
No. There are no accounts, logins, or API keys anywhere in Quartermaster. Payment is per call over the x402 protocol; your wallet is your identity.
Can I call this as an MCP tool instead?
Yes. Quartermaster is also an MCP server at /mcp, so any MCP client (Claude Code, Claude.ai, Cursor) can mount this tool. See /connect for setup.