Sicher JWT Verify

x402

Sicher JWT Verify is a paid API for AI agents from sicher.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Verifies a JWT's structure, claims (expiry, nbf, iat, issuer, audience, lifetime), and cryptographic signature (HMAC, RSA, RSA-PSS, ECDSA) against a shared secret, PEM key, or JWKS endpoint.

Price / call$0.002

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StatusUnknown

How this service works

Decodes a JWT and checks it in two layers. Structure and claims: expiry, not-before and issued-at against the current time with the clock skew you allow, issuer and audience against the values you expect, and the token lifetime. Signature: HMAC with a shared secret, or RSA, RSA-PSS and ECDSA against a PEM key or a JWKS you point at, with the kid matched to the right key.

Output

Returns a structured result indicating whether the JWT passed or failed validation, which specific checks succeeded or failed (signature, expiry, nbf, iat, issuer, audience, lifetime), the decoded payload claims, and details about which key (kid) was matched if a JWKS was used.

Example use cases

API gateway token guard

“Before letting this request through, verify the bearer JWT — check its signature against our JWKS at https://auth.mycompany.com/.well-known/jwks.json, confirm the issuer is 'https://auth.mycompany.com' and audience is 'internal-api', and reject it if it's expired or used before its not-before time.”

Microservice-to-microservice auth check

“Validate this service-to-service JWT signed with our HMAC secret 'sup3rs3cret', make sure the issuer is 'order-service' and the audience is 'inventory-service', and flag it if the token lifetime exceeds 1 hour.”

Third-party OIDC token validation

“I've got an ID token from our identity provider — can you verify it using the RSA public key in this PEM, confirm the issuer is 'https://login.example.com', audience is 'client-abc', and allow a 60-second clock skew?”

Technical details

Endpoint

POSThttps://sicher.halowerk.com/v1/jwt-verify?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need server-side, authoritative JWT verification with multi-layer checks (structure + claims + cryptographic signature) and need to support multiple algorithm families (HMAC, RSA, RSA-PSS, ECDSA) and key sources (shared secret, PEM, JWKS). Ideal for agentic pipelines where the agent must authenticate inbound requests or validate identity tokens before taking action, without implementing crypto logic itself.

Side effects

Expired token: validation fails with expiry check error
Signature mismatch: fails if secret or key does not match
JWKS fetch failure: unreachable or malformed JWKS URL causes error
kid not found: token's key ID missing from provided JWKS
Issuer/audience mismatch: claims don't match expected values
Malformed JWT: unparseable token structure returns parse error
nbf in the future: token not yet valid, fails not-before check

Input

Schema · Request body

Field	Type	Description
token	string	The JWT in compact form.
secret	string	Shared secret for HS256/384/512.
jwks_url	string	JWKS endpoint; the key is picked by kid.
public_key_pem	string	PEM public key for RS/PS/ES algorithms.
expected_issuer	string	Issuer the token must carry.
expected_audience	string	Audience the token must name.
clock_skew_seconds	integer	Tolerance for exp and nbf.
max_lifetime_seconds	integer	Flag tokens valid for longer than this.

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