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agentshelf.syntexa.ch JWT Parts Decoder
x402
agentshelf.syntexa.ch JWT Parts Decoder is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Decodes a JWT token into its header and payload components without verifying the signature
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs a decoded JWT header and payload with no signature check. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/jwt-parts first.
Output
Returns the decoded JWT header and payload as structured JSON objects, revealing all claims and header fields such as algorithm (alg), type (typ), subject (sub), expiry (exp), issued-at (iat), and any custom claims — without performing any signature verification.
Example use cases
Inspect token claims during debugging
“I'm debugging an auth issue and I have this JWT — can you decode it and tell me what the payload says? eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiI0MiIsInJvbGUiOiJhZG1pbiIsImV4cCI6MTcwMDAwMDAwMH0.signature — just need to see the claims inside.”
Audit token algorithm and issuer
“Can you parse this JWT and tell me what signing algorithm and issuer it declares in the header? eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6ImtleS0xIn0.eyJpc3MiOiJteWFwcC5jb20iLCJzdWIiOiJ1c2VyXzEyMyJ9.sig — I don't need signature verification, just the header and payload fields.”
Extract expiry and subject from token
“Pull apart this JWT for me and show me the expiry time and subject from the payload: eyJhbGciOiJIUzM4NCIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzk5IiwiZXhwIjoxNzAwMDAwMDAwLCJpYXQiOjE2OTk5OTk5OTl9.abc123 — no need to check the signature.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/jwt-parts?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to inspect JWT header or payload fields without caring about signature validity — for example during debugging, audit, or claim extraction workflows. It is a paid alternative to the free POST /v1/sandbox/jwt-parts endpoint on the same host; prefer the sandbox version if available. Do not use this endpoint when you need cryptographic verification that the token is authentic and untampered.
Side effects
- Malformed or non-JWT input string returns an error indicating invalid token format
- Input that is not a valid base64url-encoded JWT structure fails to parse
- Missing or empty text field returns a validation error
- Token with fewer than three dot-separated segments is rejected
- Very large token strings may be truncated at the 100,000 character limit
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token. |
Tags
x402
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