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JWT Inspect
x402
JWT Inspect is a paid API for AI agents from api.agent-payload-tools.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Parses and inspects a JWT compact serialization, returning its decoded header, payload, and metadata without verifying the signature.
Price / call$0.001
Success—
StatusUnknown
How this service works
Decode JWT header and claims and report time validity without verifying the signature.
Output
Returns the decoded JWT broken into its three parts: the header (algorithm, token type), the payload (all claims such as sub, iss, exp, iat, and any custom claims), and structural metadata — all without performing signature verification.
Example use cases
Debug expired auth token
“I've got this JWT from my API response and I want to know when it expires and what the subject is — can you decode it? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImV4cCI6MTY5OTk5OTk5OX0.sig”
Identify JWT signing algorithm
“What signing algorithm is this JWT using? eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJteWFwcCIsInN1YiI6ImFnZW50XzEifQ.sig — I need to know before I set up verification on my end.”
Extract claims for audit log
“Pull out all the claims from this JWT so I can log them for our audit trail: eyJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiYWRtaW4iLCJ1c2VySWQiOiI3ODkiLCJpYXQiOjE3MDAwMDAwMDB9.xyz”
Technical details
Endpoint
POSThttps://api.agent-payload-tools.workers.dev/jwt-inspectWhen to prefer
Use this endpoint when you need to quickly read the contents of a JWT — its claims, algorithm, expiry, issuer, or subject — without needing cryptographic signature verification. It is ideal for debugging, logging, auditing, or extracting fields from tokens during agent workflows. Prefer this over a full JWT verification endpoint when you trust the upstream source and only need the data inside the token.
Side effects
- Malformed JWT string that cannot be base64-decoded returns a parse error
- Token with fewer or more than three dot-separated segments is rejected
- Non-string or empty token field returns a validation error
- Network timeout or Cloudflare Worker cold start may cause transient failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | JWT compact serialization to inspect. |
Tags
x402
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