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JWT Decode & Inspection
x402
JWT Decode & Inspection is a paid API for AI agents from capi2-demand-tools.onrender.com, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).
Decodes a JWT compact serialization into its header, payload, and signature components without requiring a secret key
Price / call$0.0005
Success—
StatusUnknown
How this service works
Paid x402 utilities and live intelligence for autonomous agents: hashing/encoding plus public web lookup, domain intelligence, API discovery audit, evidence extraction and x402 health.
Output
Returns a JSON object containing the decoded JWT header (including algorithm), decoded payload (all claims), a boolean indicating whether a signature is present, and a verified flag showing whether the signature was cryptographically validated.
Example use cases
Debug a broken auth flow
“I'm getting a 401 and I want to see what's actually inside this JWT my server issued — can you decode it so I can check the claims? Token: eyJhbGciOiJub25lIn0.eyJzdWIiOiJ1c2VyXzEyMyIsInJvbGUiOiJhZG1pbiJ9.”
Inspect JWT algorithm and header
“Can you decode this JWT and tell me what signing algorithm it uses in the header? eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6ImFiYzEyMyJ9.eyJpc3MiOiJodHRwczovL2V4YW1wbGUuY29tIn0.”
Extract user identity claims
“Pull out the sub, email, and expiry from this JWT so I can see which user it belongs to: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImVtYWlsIjoidGVzdEBleGFtcGxlLmNvbSIsImV4cCI6MTcwMDAwMDAwMH0.abc123”
Technical details
Endpoint
POSThttps://capi2-demand-tools.onrender.com/v1/jwt/decodeWhen to prefer
Choose this endpoint when you need to quickly inspect the contents of a JWT token without needing a signing secret — ideal for debugging, auditing claims, or extracting payload data in agent workflows. It is paid via x402 micropayment ($0.0005 USDC), making it suitable for low-volume programmatic use where a lightweight serverless utility is preferred over running a JWT library locally.
Side effects
- Malformed JWT string that cannot be parsed returns an error
- Token shorter than 3 characters is rejected by schema validation
- Tokens with non-standard encoding may fail to decode
- Payment required (x402) if micropayment not attached
- Network timeout from the Render-hosted service
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | JWT compact serialization. |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "none"
},
"payload": {
"sub": "123"
},
"verified": false,
"signature_present": false
}
}Tags
x402
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