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finmath JWT Decode
x402
finmath JWT Decode is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-15).
Decodes and inspects a JWT token, returning its parsed claims and metadata
Price / call$0.001
Success—
StatusUnknown
How this service works
Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.
Output
Returns a result object containing the decoded JWT payload (claims such as sub, iat, exp, etc.) and a meta object with additional information about the token structure
Example use cases
Example prompt
“Can you decode this JWT token for me and tell me what claims and expiry are inside: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/jwt_decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to deterministically decode a JWT token to inspect its claims, payload, or metadata — especially when you want exact, reliable arithmetic-free parsing rather than relying on an LLM to guess at token contents. Part of the finmath suite which is priced per call in USDC via x402.
Side effects
- Invalid or malformed JWT string returns an error result
- Expired tokens may still be decoded but expiry will be visible in claims
- Missing required 'token' field returns a 400-style error
- Tokens with non-standard encodings may fail to parse
Input
{
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenrequired | string | token |
Output
{
"meta": {
"tool": "jwt_decode",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": {
"note": "Decoded only — signature NOT verified.",
"header": {
"alg": "HS256",
"typ": "JWT"
},
"payload": {
"iat": 1516239022,
"sub": "1234567890",
"name": "John Doe"
},
"signature_present": true
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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