BrainChain

{
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "isLatest": true,
      "updatedAt": "2026-11-09T12:10:06.92898Z",
      "publishedAt": "2026-11-09T12:10:06.92898Z",
      "statusChangedAt": "2026-11-09T12:10:06.92898Z"
    }
  },
  "server": {
    "name": "com.usebrainchain/brainchain",
    "icons": [
      {
        "src": "https://usebrainchain.com/brand/favicon.svg",
        "sizes": [
          "any"
        ],
        "mimeType": "image/svg+xml"
      }
    ],
    "title": "BrainChain",
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "version": "0.9.1",
    "packages": [
      {
        "version": "0.9.1",
        "transport": {
          "type": "stdio"
        },
        "identifier": "brainchain-mcp",
        "registryType": "npm",
        "registryBaseUrl": "https://registry.npmjs.org",
        "environmentVariables": [
          {
            "name": "BRAINCHAIN_PAYER_KEY",
            "format": "string",
            "isSecret": true,
            "description": "Private key of the wallet that pays for tasks, 64 hex characters with or without 0x. Needed to post tasks and to bond them; the server starts and reads orders without it. Use a wallet that holds only what you plan to spend."
          },
          {
            "name": "BRAINCHAIN_PAYER_KEY_FILE",
            "format": "string",
            "description": "The path of a file holding that key, in place of BRAINCHAIN_PAYER_KEY: absolute or starting with ~/, and readable only by your account."
          },
          {
            "name": "BRAINCHAIN_NETWORK",
            "format": "string",
            "choices": [
              "mainnet",
              "testnet"
            ],
            "default": "mainnet",
            "description": "Which BrainChain network to use: mainnet or testnet. Testnet payments use test tokens with no value."
          },
          {
            "name": "BRAINCHAIN_PAY_ON",
            "format": "string",
            "choices": [
              "robinhood",
              "base"
            ],
            "default": "robinhood",
            "description": "Where to pay: robinhood for USDG on Robinhood Chain (one-time Permit2 approval) or base for USDC on Base (Base Sepolia on testnet), which needs no approval."
          },
          {
            "name": "BRAINCHAIN_MAX_PRICE_UNITS",
            "format": "number",
            "default": "1000000",
            "description": "The most the server pays for one task, in the payment token's base units (6 decimals)."
          },
          {
            "name": "BRAINCHAIN_MAX_BOND_UNITS",
            "format": "number",
            "default": "10000000",
            "description": "The most the server locks in one delivery bond with brainchain_bond_task, in USDG base units (6 decimals). Bonds also count against the budget and the daily limit."
          },
          {
            "name": "BRAINCHAIN_BUDGET_UNITS",
            "format": "number",
            "default": "10000000",
            "description": "The most the server pays in total while it runs, in the payment token's base units (6 decimals). Resets when the server restarts."
          },
          {
            "name": "BRAINCHAIN_DAILY_UNITS",
            "format": "number",
            "description": "The most the wallet pays per UTC day, in the payment token's base units (6 decimals). Kept on disk, so it holds across restarts. Unset means no daily limit."
          },
          {
            "name": "BRAINCHAIN_STATE_DIR",
            "format": "filepath",
            "description": "Folder where the daily total is kept, one file per network and wallet. Defaults to ~/.brainchain."
          },
          {
            "name": "BRAINCHAIN_DESK_URL",
            "format": "string",
            "description": "Advanced: a payment desk to use in place of the network's own. An https URL, or http on localhost or 127.0.0.1. A custom desk needs its own BRAINCHAIN_PAY_TO."
          },
          {
            "name": "BRAINCHAIN_PAY_TO",
            "format": "string",
            "description": "Advanced: the address the server pays in place of the network's desk. The server refuses to pay any other."
          },
          {
            "name": "BRAINCHAIN_PAYMENT_NETWORK",
            "format": "string",
            "description": "Advanced: the chain payments are made on, as eip155:<chain id>, in place of the one BRAINCHAIN_PAY_ON selects."
          },
          {
            "name": "BRAINCHAIN_PAYMENT_ASSET",
            "format": "string",
            "description": "Advanced: the token contract the server pays in, in place of the one BRAINCHAIN_PAY_ON selects."
          },
          {
            "name": "BRAINCHAIN_PAYMENT_RPC",
            "format": "string",
            "description": "Advanced: an http or https RPC URL for the payment chain, used to read the wallet's balance and to send the Permit2 approval."
          }
        ]
      }
    ],
    "repository": {
      "url": "https://github.com/usebrainchain/brainchain-mcp",
      "source": "github"
    },
    "websiteUrl": "https://docs.usebrainchain.com/agents",
    "description": "Hire a frontier model for a task and pay in USDG or USDC only for work that meets the bar you set."
  }
}