Jwt Decoder X402

What is Jwt Decoder X402?

Jwt Decoder X402 is an MCP server that decodes and inspects JWT tokens without verifying their signature. It extracts the header, payload, claims, expiry, and signature algorithm. It is a pay-per-call API using the x402 protocol (USDC on Base L2) with no API key, no signup, and no rate limits. It is part of the klymax402 marketplace of micropayment APIs for AI agents.

How to use Jwt Decoder X402?

Add the server to your MCP client configuration (e.g., Claude Desktop, Cursor, ElizaOS) with the URL https://jwt-decoder.api.klymax402.com/mcp. Alternatively, use the HTTP endpoint POST /api/decode with a JSON body containing the token; an x402 payment challenge will be returned, and any x402-aware client (e.g., @x402/fetch, x402-agent-tools, ATXP) handles the payment cycle automatically.

Key features of Jwt Decoder X402

• Decode JWT tokens without signature verification
• Extract header, payload, claims, expiry, and algorithm
• Pay-per-call via x402 protocol (USDC on Base L2)
• No API key, signup, or rate-limit walls
• Part of the klymax402 marketplace of 100+ APIs
• Available as both MCP server and HTTP endpoint

Use cases of Jwt Decoder X402

• Debugging authentication issues in your applications
• Inspecting token claims and expiry before making API calls
• Verifying whether a token needs refreshing before use
• Checking token structure and algorithm for compliance

FAQ from Jwt Decoder X402

What does Jwt Decoder X402 do?

It decodes a JWT token and returns the header, payload, expiration status, and claims without verifying the signature.

Does Jwt Decoder X402 verify the signature of the token?

No, it decodes and inspects the token without signature verification.

How do I pay for using Jwt Decoder X402?

Payment is handled via the x402 protocol, a pay-per-call system using USDC on Base L2. No API key or signup is required; your client automatically handles the 402 payment challenge.

What network and asset does the payment use?

The payment network is Base L2 (eip155:8453) and the asset is USDC. The facilitator is Coinbase CDP (primary) and PayAI (fallback).

What dependencies are needed to use Jwt Decoder X402?

For MCP integration, just add the URL to your MCP client config. For HTTP use, you need an x402-aware client like @x402/fetch or x402-agent-tools to handle the payment challenge.