crossingkey-mcp

CrossingKey MCP for agent commerce, x402 payments, deterministic execution, and verifiable receipts.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    CrossingKey MCP for agent commerce, x402 payments, deterministic execution, and verifiable receipts.

    How to connect

    How to connect crossingkey-mcp to Claude

    The server address to paste into Claude settings:

    https://mcp.crossingkeyintelligence.com/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 crossingkey-mcp to ChatGPT

    The server address to paste into ChatGPT settings:

    https://mcp.crossingkeyintelligence.com/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 crossingkey-mcp to Cursor

    The server address to paste into Cursor settings:

    https://mcp.crossingkeyintelligence.com/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 (26)

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

    discover_providerFREE DISCOVERY. Returns provider identity, commerce model, payment rails, policy, and next actions before payment.
    list_capabilitiesFREE DISCOVERY. Lists free and paid capabilities with access and charging metadata.
    list_offersFREE DISCOVERY. Searches public offer metadata before payment.
    get_offerFREE QUALIFICATION. Returns enough information to evaluate one offer before paying.
    estimate_costFREE QUALIFICATION. Returns advertised USD price or request-credit cost without charging.
    preview_result_schemaFREE QUALIFICATION. Shows expected result shape without revealing paid content.
    check_requirementsFREE QUALIFICATION. Explains payment, authorization, fulfillment, and idempotency prerequisites.
    execution_preflightFREE QUALIFICATION. Final machine-readable no-charge decision point before payment or credit-consuming execution.
    list_stripe_offersLists the known CrossingKey Stripe Payment Links. Digital offers report whether the exact fulfillment file has been verified on this server.
    get_stripe_checkout_linkReturns the exact Stripe Payment Link for a known CrossingKey offer. Never invents a checkout URL.
    get_request_credit_linksReturns the live Stripe Payment Links for prepaid CrossingKey request credits.
    get_fulfillment_statusChecks whether a Stripe offer has a verified delivery file bound to this server.
    list_request_servicesLists request services approved after the safe-file scan. Empty until services are explicitly approved.
    crossingkey.describeFREE. Describes the receiver-only CrossingKey machine-commerce service and its safety boundaries.
    capabilities.listFREE. Lists deterministic paid machine-commerce capabilities without executing them.
    capability.getFREE. Returns one deterministic capability definition and exact advertised price.
    capability.quoteFREE. Returns x402 v1 and v2 challenge requirements for one capability without executing or settling payment.
    payment.methodsFREE. Lists supported payment methods and explicitly reports the receiver-only wallet boundary.
    purchase.statusFREE STATUS. Returns the state of a machine-commerce purchase by its idempotency key without revealing paid result content.
    entitlement.inspectFREE STATUS. Inspects entitlement state by identifier without granting execution or result access.
    fulfillment.statusFREE STATUS. Returns fulfillment state and result hash by purchase idempotency key.
    fulfillment.getFREE STATUS. Returns fulfillment identifiers and integrity binding but does not disclose paid result content.
    receipt.verifyFREE. Recomputes the deterministic result hash embedded in a CrossingKey receipt.
    healthFREE. Returns local service readiness flags and the mainnet safety-gate state.
    payment.verify_onchainFREE READ-ONLY. Independently verifies a CrossingKey Base mainnet USDC transfer using Base JSON-RPC and optionally reconciles an existing receipt.
    xkey_validate_intakePaid bounded intake validation. Costs 1 prepaid credit on verified success. Safe validation failures release the reserved credit.