CrossingKey MCP

Name: CrossingKey MCP
Author: crossingkey-holdings

by crossingkey-holdingsversion 3.0.1i★ –iRuns in the cloud

Registry namecom.crossingkeyintelligence/crossingkey-mcp

Install

Overview

Description from the maker (original English)

Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi0 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Online shops & payments

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 0 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.crossingkeyintelligence.com/mcp

Run this in your terminal

claude mcp add --transport http crossingkey https://mcp.crossingkeyintelligence.com/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "crossingkey": {
      "url": "https://mcp.crossingkeyintelligence.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "crossingkey": {
      "type": "http",
      "url": "https://mcp.crossingkeyintelligence.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.crossingkeyintelligence.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

! Caution
Maker matches the repo
The publisher (crossingkeyintelligence.com) is not the repo owner (crossingkey-holdings); someone else may have listed it
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Online shops & paymentsi

More stars than 0% of the other 1745 servers in this category
Published to the registry more recently than 55% of the other 1745 servers in this category
Basic checks equal to or better than 41% of the other 1745 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is CrossingKey MCP safe?

It passed 0 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (3.0.1) reached the registry 27 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spree Commerce: open-source B2B and marketplace ecommerce, Stripe MCP, MCP Cn Commerce

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spree Commerce: open-source B2B and marketplace ecommerce

by spree

Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.

Runs in the cloud★ 15,812BSD-3-ClauseUpdated 7 days ago

Install

Stripe MCP

by stripe

Stripe’s official server lets AI view and manage customers, products, payments and invoices. Connect to Stripe’s cloud and sign in with OAuth.

Runs in the cloud★ 2,043MITUpdated 12 months ago

Install

MCP Cn Commerce

by TonyWang-hub

8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending

Runs on your computer★ 96MITUpdated 27 days ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

CrossingKey MCP

Agent-native MCP for governed commerce, x402 payments, paid capabilities, and verifiable receipts.

Production

Endpoint

https://mcp.crossingkeyintelligence.com/mcp

Canonical identity

com.crossingkeyintelligence/crossingkey-mcp

Stable source target

5.0.1 — the exact dependency-hardening source being prepared for promotion.

Current public runtime before host cutover

5.0.0 — the current public runtime before the v5.0.1 host cutover.

Promotion state

The source is being prepared as patch release 5.0.1. The host-side restart and GitHub release/tag are performed only after the running process is verified against this exact source.

Public verification

Cloudflare Tunnel crossingkey-mcp is healthy.
mcp.crossingkeyintelligence.com routes to the V5 origin on 127.0.0.1:3401.
Public discovery reports V5, Streamable HTTP, and Base mainnet eip155:8453.
No live payment or Base settlement is implied by discovery metadata alone.

This repository is the source of truth for the v5.0.1 candidate. Runtime deployment and release tagging are tracked separately.

Public documentation

Transport

MCP Streamable HTTP

CrossingKey MCP v5.0.1

CrossingKey MCP is a governed machine-commerce interface for AI agents and authorized software clients.

The stable source preserves the existing anonymous MCP surface and adds the two authorized v4 paid audits. The exact live/public tool count remains a deployment-time verification item.

7 free discovery and commercial-navigation tools
8 public marketplace tools
13 direct x402 paid tools plus a separately named legacy credit-redemption compatibility tool for existing customers

Authenticated sessions additionally expose verification and role-gated marketplace operations.

The operating principle is:

Discovery is free. Evaluation is safe. Payment is explicit. Authority stays bounded. Execution is deterministic. Fulfillment is verifiable.

Free discovery

These seven tools can be used anonymously to understand the provider, available offers, requirements, price, expected result, authorization state, and prepaid-credit options without spending money:

provider.describe
offers.list
requirements.check
cost.estimate
result.preview
execution.preflight
credits.options (legacy compatibility status; new credit sales are disabled)

The normal discovery sequence is:

provider.describe

→ offers.list → requirements.check → cost.estimate → result.preview → execution.preflight → credits.options (legacy compatibility status; new credit sales are disabled)

A valid commercial flow may reach:

READY_FOR_HUMAN_AUTHORIZATION

and then stop at:

STOPPED_BEFORE_PAYMENT

until the required buyer authorization and payment conditions are satisfied.

Public marketplace discovery

The preserved anonymous marketplace surface also exposes:

marketplace.describe
provider.register
provider.get
capability.get
capability.search
catalog.list
commerce.quote
creator.apply

Discovery, catalog browsing, capability inspection, and quoting do not themselves authorize paid execution.

provider.register and creator.apply are public write surfaces for application and intake workflows. They do not grant unrestricted commercial authority.

Paid and gated execution

These 13 tools perform valuable computation, validation, or artifact generation and use direct x402 payment:

x402.compatibility_audit
mcp.schema_audit
openapi.quality_audit
machine_commerce.readiness_audit
artifact.integrity_manifest
xkey.validate

Current v4 paid capabilities use exact x402 Base USDC payments. Historical prepaid credit balances remain redeemable only through the separately named legacy compatibility path; v4 does not sell new credit packs.

Free discovery does not consume paid execution credits.

Authenticated verification

Authenticated sessions can expose read-only verification tools including:

approval.verify
idempotency.inspect
receipt.verify
entitlement.inspect

Marketplace sessions may additionally expose role-gated job, receipt, purchase, provider, capability, and settlement operations.

Approval minting remains a local operator action and is not exposed over MCP.

Commercial flow

The governed machine-commerce path is:

discover

→ inspect requirements → estimate cost → preview result → preflight → authorize → pay → verify settlement → execute → issue result → bind entitlement → issue verifiable receipt

Payment alone does not create unrestricted authority.

Authorization, payment verification, execution, fulfillment, entitlement creation, and receipt generation remain separate governed stages.

Human authorization

CrossingKey does not treat an LLM-supplied boolean such as approved: true as buyer authorization.

Where human authorization is required, approval is bound to the relevant commercial context, including the buyer, capability, inputs, quote, idempotency state, and expiration conditions.

Paid execution does not occur merely because an agent asks for it.

MCP resources

The candidate preserves the public MCP resources for agent comprehension:

crossingkey://discovery-guide
crossingkey://commerce-policy
crossingkey://capability/{name}

These describe the free discovery sequence, commerce policy, and per-capability instructions.

Machine commerce

CrossingKey supports governed machine-payment infrastructure including:

x402 v1
x402 v2
Base USDC
historical prepaid request credits through a separately named compatibility path only
settlement verification
entitlements
result-bound receipts
idempotent execution
replay protection

The CrossingKey seller wallet boundary is receiver-only.

Agents are not granted unrestricted wallet signing, sending, swapping, bridging, or autonomous seller-spend authority.

Security properties

The production design includes:

bounded input validation
strict capability schemas
SSRF protections
DNS and address validation
response-size controls
authorization boundaries
approval binding
idempotency protection
payment replay protection
duplicate-settlement protection
deterministic result hashing
entitlement binding
receipt verification
receiver-only seller wallet policy
explicit uncertain-settlement handling

No private keys, wallet secrets, Stripe secrets, API keys, seed phrases, mnemonics, or private customer information belong in this repository.

Agent discovery

Recommended entry point:

provider.describe

Canonical MCP endpoint:

https://mcp.crossingkeyintelligence.com/mcp

Canonical identity:

com.crossingkeyintelligence/crossingkey-mcp

Official MCP Registry identity:

com.crossingkeyintelligence/crossingkey-mcp

Website:

https://www.crossingkeyintelligence.com

CrossingKey Intelligence

Operating online under the handle crossingkey_.

intelligence is the standard.

CrossingKey MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Online shops & paymentsi

Common questions

Alternatives

Spree Commerce: open-source B2B and marketplace ecommerce

Stripe MCP

MCP Cn Commerce

README from the maker

CrossingKey MCP

Production

CrossingKey MCP v5.0.1

Free discovery

Public marketplace discovery

Paid and gated execution

Authenticated verification

Commercial flow

Human authorization

MCP resources

Machine commerce

Security properties

Agent discovery

CrossingKey Intelligence