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JWT Decode
x402
JWT Decode is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Decodes a JWT token string and returns its decoded header, payload, and signature components without verification.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable x402 utilities for hashing, Base64, UUID generation, unit and timezone conversion, realtime crypto market data, webpage/document extraction, URL-to-Markdown, metadata, RAG ingestion and deterministic website change detection.
Output
Returns the decoded JWT broken into its constituent parts: the header (algorithm, token type), the payload (all claims such as sub, iat, exp, roles, and any custom fields), and the signature component — presented as structured JSON objects rather than base64-encoded strings.
Example use cases
Inspect access token claims
“I have this JWT access token from our auth system — can you decode it and tell me what claims are in it, like the user ID, roles, and expiry time? Here it is: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...”
Debug expired session token
“Our users are getting logged out unexpectedly. Can you decode this JWT session token and check what the expiration time is set to? Token: eyJhbGciOiJIUzI1NiJ9.eyJleHAiOjE2OTAwMDAwMDB9.abc123”
Audit third-party API token
“We received a JWT from a third-party vendor and I need to understand what's inside it before we use it — can you decode it and list all the fields in the payload? Here's the token: eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ2ZW5kb3IuY29tIn0.signature”
Technical details
Endpoint
POSThttps://x402-gateway-production-1f21.up.railway.app/jwt/decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a machine-payable, infrastructure-free way to decode JWTs without setting up a local library — ideal for AI agents, serverless pipelines, or quick inspection of tokens from third-party systems. Prefer this over rolling your own decoder when operating in an x402 micropayment context or when you need a consistent, hosted utility callable by any agent regardless of runtime environment.
Side effects
- Malformed JWT string (not in three-part base64 format) returns an error
- Token exceeds 200,000 character limit returns validation error
- Empty or missing token field returns required field error
- Non-JWT base64 strings passed as tokens may produce garbled output or errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "ready"
}
}Tags
x402
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