cortexcloud

@cortexcloud.org/mcp

MCP server for CortexCloud — pay-per-call on-chain data and intelligence for AI agents. Token, wallet, risk, whale, balance, NFT, transaction and cross-chain reads, settled in USDC on Base over x402. No API keys, no subscriptions, no signup.

Two ways to connect

1. Remote (recommended). The hosted server speaks Streamable HTTP and is always current:

{
  "mcpServers": {
    "cortexcloud": {
      "type": "http",
      "url": "https://api.cortexcloud.org/mcp"
    }
  }
}

2. stdio bridge. This package, for clients that can only launch a local process:

{
  "mcpServers": {
    "cortexcloud": {
      "command": "npx",
      "args": ["-y", "@cortexcloud.org/mcp"]
    }
  }
}

The bridge is a transport adapter, not a second implementation: it forwards tools/list and tools/call to the hosted server, so tools, schemas and prices can never drift from the API.

Tools

17 tools, served from the live registry:

• Paid (15) — cortex_token_intel ($0.030), cortex_cross_chain_compare ($0.040), cortex_whale_alerts ($0.030), cortex_token_risk ($0.020), cortex_wallet_intel ($0.006), and the $0.004 data routes: cortex_token_price, cortex_token_balances, cortex_nft_ownership, cortex_tx_history, cortex_gas_oracle, cortex_block, plus the batch tools cortex_aggregate_balances, cortex_aggregate_nfts, cortex_aggregate_prices, cortex_aggregate_tx_history (up to 20 items per call).
• Free (2) — cortex_capabilities (every route, chain and price) and cortex_prices (the price table).

The authoritative list is always GET https://api.cortexcloud.org/v1/capabilities, or cortex_capabilities over MCP.

How payment works

A paid tool call without payment returns the x402 challenge inside the tool result: price, payee, asset, network, and the endpoint to call. Nothing is charged and no wallet is needed to read it.

To settle, the caller signs an EIP-3009 USDC authorization and replays the request with the payment-signature header. Over MCP the server relays that header to the API unchanged; it holds no funds and never signs. Over stdio, forward an existing signature with:

CORTEXCLOUD_PAYMENT_SIGNATURE=<base64 header> npx -y @cortexcloud.org/mcp

For a complete paid flow from code, use the REST reference client — 402 -> sign -> 200 in one file:

https://api.cortexcloud.org/examples/paid_client.py

Env

Variable	Default	Meaning
CORTEXCLOUD_BASE	https://api.cortexcloud.org	API base; the bridge connects to <base>/mcp
CORTEXCLOUD_PAYMENT_SIGNATURE	—	Optional x402 payment header forwarded on every call

Verified behaviour

• initialize advertises protocol 2025-06-18; the upstream server reports version 0.5.0.
• tools/list returns 17 tools.
• cortex_capabilities returns the live catalog with no payment.
• cortex_token_price without payment returns the 402 challenge, not an error.

Links

• API + docs: https://api.cortexcloud.org/docs
• Discovery: x402.json · bazaar · llms.txt
• Latency and prices: https://api.cortexcloud.org/benchmarks.html

MIT licensed.