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JWT Secrets is a free, developer-focused tool for generating secure, cryptographically strong secret keys for JSON Web Tokens (JWT). It also runs a real machine-payable JWT API at mpp.jwtsecrets.com: agents can decode, verify and crack JWTs and pay per call — from $0.001 — over HTTP 402, supporting both the x402 standard (exact scheme, USDC on Base) and the Machine Payments Protocol (Tempo / pathUSD). It even ships an MCP server. That makes it one of the clearest live examples of x402 monetization in the wild — exactly the kind of infrastructure builders in this directory ship every day.

• →Free, instant JWT secret-key generation — no signup required
• →Machine-payable JWT API: decode, verify and crack JWTs, paid per call
• →Pay over HTTP 402 via x402 (USDC on Base) or MPP (Tempo / pathUSD)
• →A real, live example of x402 monetization — even ships an MCP server

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