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NexusAPI JWT Decode
x402
NexusAPI JWT Decode is a paid API for AI agents from nexus-api-virid.vercel.app, paid per call via x402, $0.11915/call, status unknown (last checked 2026-09-15).
Decodes a JWT (JSON Web Token) to extract its header, payload, and claims without verifying the signature
Price / call$0.11915
Success—
StatusUnknown
How this service works
Crypto, AI, Social Media, Finance, Weather, Tools & more. Pay per call in USDC on Base. No API keys.
Output
Returns the decoded JWT broken into its three parts: the header (algorithm, token type), the payload (all claims such as sub, iat, exp, iss, aud, and any custom fields), and optionally the raw signature portion — without performing cryptographic signature verification.
Example use cases
Inspect expired auth token
“I have this JWT from our API response and I want to check when it expires and what user ID it belongs to — can you decode it and show me those fields? Here's the token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiI0MiIsImV4cCI6MTcwMDAwMDAwMH0.abc123”
Debug OAuth access token claims
“We're getting auth errors in production — can you decode this access token and tell me what scopes and audience claims it contains? Token: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c3IxMjMiLCJzY29wZSI6InJlYWQ6d3JpdGUiLCJhdWQiOiJteWFwcCJ9.xyz789”
Extract username from session token
“Given this JWT from our session cookie, can you pull out the username, role, and issued-at timestamp so I can log them for debugging? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImFsaWNlIiwicm9sZSI6ImFkbWluIiwiaWF0IjoxNjAwMDAwMDAwfQ.sig”
Technical details
Endpoint
POSThttps://nexus-api-virid.vercel.app/api/tools/jwt/decodeWhen to prefer
Choose this endpoint when you need to quickly inspect, debug, or extract claims from a JWT token without needing cryptographic signature verification. Ideal for logging, debugging, extracting metadata (user ID, expiration, roles) from tokens you already trust, or building tooling that needs to read token contents programmatically.
Side effects
- Malformed or truncated JWT returns a parse error
- Non-JWT string input returns invalid token error
- Empty input returns a validation error
- Note: this endpoint decodes but does NOT verify the signature — claims should not be trusted for auth decisions based solely on this endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | Search query or input parameter |
Output
Schema · Response
{
"type": "object",
"description": "API response data"
}Tags
x402
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