Name: jwt-decode
Price: 0.003 USDC
Availability: InStock

$ man jwt-decode

agentutility / web-probe / jwt-decode

PRICE / CALL

$0.003

USDC · base mainnet · scheme: exact

METHOD

POST

CLUSTER

webprobe

CATEGORY

utilities

STATUS

● live

NAME

jwt-decode — jwt decoder / token inspector / debug tool

SYNOPSIS

POST https://x402.org/v1/jwt-decode
     Content-Type: application/json
     X-PAYMENT:    <signed-transferWithAuthorization>

     { ... }

↳ first call → 402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.

DESCRIPTION

JWT decoder / token inspector / debug tool. Splits a JWT into header / payload / signature, base64url-decodes each, parses claims (iss, aud, sub, jti, iat, exp, nbf, kid, alg), and reports clock-validity. Does NOT verify signatures.

INPUT — request schema

property	type	description	req?
jwt	string	JWT (with or without 'Bearer ' prefix).	required

OUTPUT — response shape

field	type	description
header	object	Decoded JWT header object with parsed JOSE fields like alg, typ, kid, and any custom header parameters.
payload	object	Decoded JWT payload object with all claims parsed from the base64url-decoded middle segment.
signature	string	Raw signature segment from the JWT as a base64url string; not verified by this endpoint.
algorithm	string	Signing algorithm declared in the header's alg field, such as HS256, RS256, ES256, or none.
key_id	string	Key identifier from the header's kid field, used by verifiers to select the right signing key.
type	string	Token type from the header's typ field, typically JWT but sometimes at+jwt or similar variants.
claims	object	Standard JWT claims extracted from payload: iss, aud, sub, jti, iat, exp, nbf with parsed timestamps.
is_expired	boolean	True if exp claim is present and the expiration timestamp is in the past relative to server clock.
is_not_yet_valid	boolean	True if nbf claim is present and the not-before timestamp is in the future relative to server clock.
is_currently_valid_by_clock	boolean	True if the token is neither expired nor not-yet-valid by clock; signature validity is not checked.
payload_size_bytes	number	Byte length of the decoded payload JSON, useful for spotting oversized tokens.
note	string	Reminder that this endpoint only decodes and clock-checks; it does not cryptographically verify signatures.

EXAMPLES — two ways to call

EXAMPLE 1 · curl

curl -X POST https://x402.org/v1/jwt-decode \
  -H 'Content-Type: application/json' \
  -d '{ }'

first response = 402 Payment Required with payment requirements; sign + retry with X-PAYMENT.

EXAMPLE 2 · mcp

# install once
claude mcp add x402 --command "npx x402-deployer-mcp"

# then ask Claude Code:
# "use the jwt-decode tool to ..."

MCP server handles payment automatically — your coding agent just calls the tool by name.

METADATA

tags: jwttokenauthdebugdeveloper
methods: POST
cluster: webprobe
price: $0.003 USDC per call

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/jwt-decode(1)