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jwtcheck Verified
Decode JWTs free, verify signatures for 0.02 USDC
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About this tool
jwtcheck is a developer tool that decodes JWT headers and payloads for free, surfacing expiry, issuer, claims, and common mistakes like alg:none or missing exp. Paid signature verification (HS256/384/512, RS256/384/512, ES256/384) is available for 0.02 USDC on Base. Built by Doormat Capital, it requires no signup and processes tokens entirely within its worker.
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