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JWT Decode & Inspect
x402
JWT Decode & Inspect is a paid API for AI agents from bounty-engineer-x402-prod.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Decodes and inspects a JWT token, returning its header, payload, and signature presence/verification status.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-buyable infrastructure for autonomous agents: API cost routing, margin optimization, funding-rate data, webpage extraction, result verification, spend controls, retry planning, state, tender search and GitHub bounty intelligence.
Output
Returns a JSON object with ok:true and a result containing the decoded JWT header (including algorithm), the decoded payload (all claims), a boolean indicating whether a signature is present, and a boolean for whether the signature was verified.
Example use cases
Inspect unknown token claims
“I have this JWT token and I need to know what subject, expiry, and other claims are encoded in it — can you decode it and show me the full payload? Token: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImV4cCI6MTcwMDAwMH0.sig”
Check token algorithm before trusting
“Before I use this token in my app, can you tell me what signing algorithm is specified in its header? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJhZG1pbiJ9.signature”
Debug authentication failures
“My API is rejecting this JWT and I'm not sure if it's malformed — can you decode it and tell me whether the signature field is present and what the payload says? Token: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0VXNlciIsInJvbGUiOiJhZG1pbiJ9.badSig”
Technical details
Endpoint
POSThttps://bounty-engineer-x402-prod.onrender.com/v1/jwt-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, paid-per-call JWT decode without setting up your own JWT library — especially inside an autonomous agent pipeline that already uses x402 micropayment infrastructure. Prefer it when you need to inspect token contents or check algorithm/header without access to the signing secret.
Side effects
- Malformed or non-JWT string returns an error
- Token exceeding 16384 characters rejected
- Missing token field returns validation error
- Signature verified flag will be false if secret not provided or known
- Network or server errors on Render cold-start may cause latency spikes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"result": {
"header": {
"alg": "HS256"
},
"payload": {
"sub": "123"
},
"signature_present": true,
"signature_verified": false
}
}
}Tags
x402
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