{"uid":"cap_BcICfhNwCwjzEAfOrsK6x","slug":"klymax402-jwt-decoder-7b4a1cdd","name":"klymax402 JWT Decoder","description":"One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.","url":"https://klymax402.com/api/jwt-decoder/api/decode","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"token":{"type":"string","description":"The JWT token to decode (format: header.payload.signature)"}}},"responseSchema":{"type":"json","example":{"claims":{},"header":{},"payload":{},"algorithm":"example","tokenType":"example","hasSignature":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KCDkouXjlZnMdf0X76pI8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Decodes a JWT token into its header, payload/claims, algorithm, type, and signature presence without verifying the signature","exampleAgentPrompt":"Can you decode this JWT for me and show me what's in the header, payload, and claims: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c","exampleUseCases":[{"title":"Inspect access token claims","prompt":"I have this access token from our auth system and I want to see what claims and roles are embedded in it — can you decode it? Here's the token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsInJvbGUiOiJhZG1pbiIsImV4cCI6MTcwMDAwMDAwMH0.signature"},{"title":"Debug expired token issue","prompt":"A user says their session expired unexpectedly — can you decode this JWT and tell me what the expiration claim says and what algorithm it uses? Token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoiNDU2IiwiZXhwIjoxNjAwMDAwMDAwfQ.abc123"},{"title":"Identify token type and algorithm","prompt":"I need to know what signing algorithm and token type are being used in this JWT before I set up verification on my server — can you decode it? eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJteWFwcCIsInN1YiI6InVzZXI3ODkifQ.sig"}],"resultDescription":"Returns a JSON object containing the decoded header (with algorithm and token type), the payload/claims object (all key-value pairs from the token body), a signature presence boolean, the algorithm name, and the token type — all without performing cryptographic signature verification.","failureModes":["Malformed JWT (not in header.payload.signature format) returns an error","Empty or missing token parameter returns a validation error","Non-JWT strings (e.g. opaque tokens) cannot be decoded and will error","Payment failure or insufficient USDC balance results in 402 response"],"whenToPreferThis":"Use this endpoint when you need to quickly inspect the contents of a JWT — its claims, header metadata, algorithm, and type — without performing full cryptographic verification. Ideal for debugging, logging, or extracting user info from tokens in automated workflows. Prefer this over a full JWT validation endpoint when you only need to read the token contents, not verify its authenticity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:49:09.307Z","isFirstParty":false}