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pastable-x402 JWT Decode
x402
pastable-x402 JWT Decode is a paid API for AI agents from pastable-x402.pages.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Decodes a JWT token to extract its header, payload, signature presence, and expiry information without verifying the signature.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pay-per-call utility APIs for agents: EVM helpers (checksum, unit conversion, keccak), data transforms (CSV to JSON, JSON diff, URL canonicalisation), text tools (hashing, JWT decode), and Bazaar market intelligence. x402 on Base mainnet.
Output
Returns a JSON object containing the decoded JWT header (including algorithm and type), the payload (all claims), a boolean for signature presence, the expiration timestamp if present, seconds until expiry, and an expired flag. Note: signature is not cryptographically verified.
Example use cases
Inspect token claims in debugging
“I have this JWT and I need to see exactly what claims and payload it contains for debugging — can you decode it for me? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiJhYmMxMjMiLCJyb2xlIjoiYWRtaW4ifQ.signature”
Check if auth token is expired
“Can you tell me if this bearer token has expired and how many seconds are left before it does? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiI5OTkiLCJleHAiOjE3MDAwMDAwMDB9.abc123”
Extract JWT algorithm and subject
“What signing algorithm and subject claim are in this JWT? eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImlhdCI6MTYwMDAwMDAwMH0.sig”
Technical details
Endpoint
GEThttps://pastable-x402.pages.dev/text/jwt-decodeWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT token — its claims, algorithm, and expiry — without needing to cryptographically verify the signature. Ideal for debugging, logging, or extracting payload data from tokens you already trust contextually. Not suitable when signature verification is required for security-critical flows.
Side effects
- Malformed or non-JWT string returns an error
- Missing required 'token' query parameter returns 400
- Payment failure (x402) if USDC not provided or insufficient balance
- Token with no expiry claim returns null for expires_at and seconds_until_expiry
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "HS256",
"typ": "JWT"
},
"expired": null,
"payload": {
"sub": "1"
},
"expires_at": null,
"signature_present": true,
"seconds_until_expiry": null,
"signature_was_not_checked": true
}
}Tags
x402
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