Tools / Developer utilities
JWT Decoder $0.001 / call
Decode a JWT header and payload.
GET /v1/jwt-decodeDecodes a JWT's header and payload and surfaces expiry status. The signature is NOT verified — this is a decoder, not a validator.
Parameters
token required | JWT to decode |
Example
macOS / Linuxcurl -s "https://quartermaster.surewhynot.app/v1/jwt-decode?token=eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.abc"curl.exe -s "https://quartermaster.surewhynot.app/v1/jwt-decode?token=eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.abc"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
Is it safe to submit my token?
Never submit a token that carries live secrets or session authority. The signature is not verified and the raw token is not logged, but treat any JWT you paste anywhere as exposed.
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.