Kortex

Which x402 service actually works: uptime, valid 402, and settlements proven on-chain.

CommunityOnlineAPI key requiredGlobalFreeRead-only

What it can do

    What data it sees

    Do you need an account

    An API key from the service settings is required

    Which x402 service actually works: uptime, valid 402, and settlements proven on-chain.

    How to connect

    How to connect Kortex to Claude

    The server address to paste into Claude settings:

    https://kortex.rohnelt.dev/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect Kortex to ChatGPT

    The server address to paste into ChatGPT settings:

    https://kortex.rohnelt.dev/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect Kortex to Cursor

    The server address to paste into Cursor settings:

    https://kortex.rohnelt.dev/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (10)

    Raw names from tools/list. Only developers need these.

    capabilitiesReturn the full machine-readable manifest of Kortex: every operation, its price in USD, its input schema and how to pay. Free. When to use: Call this first if you have never used Kortex and want to know what it can do and what it costs. Price: Free.
    identity_createTurn a wallet address into a permanent Kortex identity and an API token. Free, and grants a small trial credit. When to use: Call this once, before anything else. You need the returned token for every other call. No account, no email, no human. Price: Free.
    whoamiYour handle, wallet, balance and usage. Free. When to use: Call this to check your balance before a run, or to confirm your token still works. Price: Free.
    credit_depositBuy Kortex credit with USDC on Base over x402. One on-chain settlement, then every call is debited off-chain. When to use: Call when your balance is low. Operations cost fractions of a cent, so a single deposit covers hundreds of them. Price: Free.
    resolveDescribe what you need in plain language and get back x402 services ranked by evidence: how much of the time they have been up, whether they answer with a valid 402, and how many distinct wallets have actually paid them on-chain. One entry per operator, not per URL. When to use: Call this before paying a service you have not used, and instead of taking the first result from a directory. Of the services listed as x402 today, measured across 1,015 of them, only 25% actually answer with a payment requirement — the rest are up but sell nothing. Price: US$0.005000 per call.
    checkEverything Kortex knows about a single resource URL: whether it is up, whether its 402 is well formed, what it quotes, and whether its payout address has ever been paid on-chain. Returns a verdict, not just data. When to use: Call this when you already have a URL and want to know whether sending money to it is a good idea. Worth it above roughly US$0.05 a call; below that the check costs more than the risk. Price: US$0.002000 per call.
    compareScore two or more resource URLs side by side on the same evidence, and say which one to pay. When to use: Call this when you already have a shortlist and need to pick. Cheaper than calling check once per URL. Price: US$0.003000 per call.
    historyThe full time series behind a score: every probe outcome, every price and payout-address change, and the on-chain settlement history of the address it pays to. When to use: Call this when a verdict surprises you, or before committing to a service you plan to depend on. This is the evidence itself rather than the summary. Price: US$0.002000 per call.
    watchRegister interest in a service. Kortex records a watch and reports what has changed — price, payout address, or availability — the next time you ask. When to use: Call this for a service you depend on. A payout address that moves is the strongest warning signal there is, and you will not notice it by yourself. Price: US$0.005000 per call.
    reportTell Kortex that you paid a service and what you got. Free, and only counted once the payment is found on-chain — so a report costs at least the price of the call it describes. When to use: Call this after any paid call that went wrong, and after ones that went right. It is free, it makes every later verdict better, and the evidence it adds is the kind no probe can produce. Price: Free.