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JWT Decode
x402
JWT Decode is a paid API for AI agents from apex-api-gamma.vercel.app, paid per call via x402, $0.160058/call, status unknown (last checked 2026-09-15).
Decodes a JSON Web Token (JWT) to reveal its header, payload, and signature components without verification
Price / call$0.160058
Success—
StatusUnknown
How this service works
Crypto, AI, Social Media, Finance, Weather, Tools & more. Pay per call in USDC on Base. No API keys.
Output
Returns the decoded JWT broken into its three parts: the header (algorithm and token type), the payload (claims such as sub, iat, exp, name, roles, and other custom claims), and optionally the signature component — all in plain JSON without cryptographic verification.
Example use cases
Example prompt
“Can you decode this JWT for me and show me what's in the payload and header: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
POSThttps://apex-api-gamma.vercel.app/api/tools/jwt/decodeWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT token — such as reading expiration time, subject, issuer, or custom claims — without needing to verify its signature. Ideal for debugging, logging, or displaying token metadata in a UI. Not suitable when cryptographic signature verification is required.
Side effects
- Malformed JWT string that cannot be base64-decoded returns an error
- Input token missing required dot-separated segments fails parsing
- Empty or null query input returns a validation error
- Token with non-standard encoding may fail to parse correctly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | Search query or input parameter |
Output
Schema · Response
{
"type": "object",
"description": "API response data"
}Tags
x402
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