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Swift Bot Labs JWT Decode & Verify
x402
Swift Bot Labs JWT Decode & Verify is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Decodes a JWT token into its header, payload, and timestamp fields, and optionally verifies its HMAC signature against a provided secret.
Price / call$0.003
Success—
StatusUnknown
How this service works
62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.
Output
A JSON object with ok=true and a result containing: the decoded header (algorithm, type), decoded payload (all claims), issued-at and other timestamps formatted as ISO 8601 strings, an expired boolean, and a signatureVerified boolean if a secret was provided.
Example use cases
Inspect auth token from login flow
“I've got this JWT from our auth server and I want to see what's inside it — header, payload, and whether it's expired: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTcwMDAwMDAwMH0.abc123”
Verify webhook JWT signature
“Can you verify this JWT token's signature using the HMAC secret 'wh_secret_abc' (UTF-8)? The token is eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJldmVudCI6InBheW1lbnQiLCJhbW91bnQiOjEwMH0.xyz789 — I need to confirm it wasn't tampered with before processing the webhook.”
Debug JWT with base64-encoded secret
“Decode this JWT and check the signature using my base64-encoded secret 'c2VjcmV0a2V5MTIz': eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiI0MiIsInJvbGUiOiJhZG1pbiJ9.def456 — I want to see the full payload and know if the sig checks out.”
Technical details
Endpoint
POSThttps://x402-toolbox.swiftbotlab.workers.dev/v1/jwt/decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, serverless JWT decode or HMAC signature check without importing a JWT library or spinning up infrastructure. Ideal for AI agents operating in sandboxed environments, scripts needing one-off token inspection, or workflows that need to verify HS256 tokens on demand. Pay-per-call with no account setup makes it convenient for low-volume or ad-hoc use cases.
Side effects
- Malformed JWT string (not three dot-separated base64 parts) returns an error
- Wrong or mismatched secret causes signatureVerified: false rather than an error
- Incorrect secretEncoding (e.g. passing raw bytes as utf8) yields failed verification
- Payment failure via x402 if USDC balance is insufficient
- Token exceeds 16384 character limit
- Missing required token field returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | |
| secret | string | Optional HMAC secret to verify the signature |
| secretEncoding | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "jwt-decode",
"result": {
"times": {
"iat": "2018-01-18T01:30:22.000Z"
},
"header": {
"alg": "HS256",
"typ": "JWT"
},
"expired": false,
"payload": {
"iat": 1516239022,
"sub": "1234567890",
"name": "John Doe"
},
"signatureVerified": true
}
}
}Tags
x402
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