Butterfly Delta Preflight MCP

An MCP server providing tools to simulate exact crypto orders against live Coinbase and Gemini order-book depth, returning signed execution gate states (PASS, BLOCK, UNKNOWN) to verify execution integrity before submission.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-07Operated by Butterfly Delta

MCP endpoint (Streamable HTTP)

https://butterflydelta.com/api/mcp

Vendor documentation

What its tools do

2 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

2 of 2 have a description · 0 of 2 declare behavior hints · 2 of 2 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 7, 2026, 9:18 AM UTC
Passed Official MCP Registry namespace is tied to butterflydelta.com · Nov 7, 2026, 6:23 AM UTC
Passed Endpoint is on the registry namespace domain · Nov 7, 2026, 6:23 AM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Simulate exact crypto orders against live order-book depth
Return signed execution gate states (PASS, BLOCK, UNKNOWN)
Check venue status, spread, and cross-venue midpoint deviation

Source and maintenance

Vendor evidenceRegistry 1.1.0

mcp-registry: com.butterflydelta/preflight@1.1.0 Project website

Protocol and capabilities

Server: com.butterflydelta/preflight 1.1.0
MCP protocol negotiated in check: 2025-11-25
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Call delta_preflight immediately before every autonomous USD-pair crypto spot order. Continue only on PASS under your independent authorization and risk policy; fail closed on BLOCK or UNKNOWN.

Tools

2 advertised

delta_peek — Preview Butterfly Delta coverage

Advertised by the server during the last successful anonymous check.

Free. Check whether a USD spot pair is covered and inspect the exact $0.01 Base USDC preflight price before paying.

delta_peek input schema

{
  "type": "object",
  "required": [
    "trade"
  ],
  "properties": {
    "trade": {
      "type": "object",
      "required": [
        "pair"
      ],
      "properties": {
        "pair": {
          "type": "string",
          "pattern": "^[A-Za-z0-9]{2,15}[-/_]USD$",
          "description": "USD spot pair, for example BTC-USD."
        },
        "side": {
          "enum": [
            "buy",
            "sell"
          ],
          "type": "string"
        },
        "venue": {
          "enum": [
            "coinbase",
            "gemini"
          ],
          "type": "string",
          "description": "Optional exact-order venue. Include with side and baseSize."
        },
        "baseSize": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "orderType": {
          "enum": [
            "market",
            "limit"
          ],
          "type": "string",
          "default": "market"
        },
        "limitPrice": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "minHealthyVenues": {
          "type": "number",
          "default": 2,
          "maximum": 2,
          "minimum": 1
        },
        "maxVenueSpreadBps": {
          "type": "number",
          "default": 10,
          "maximum": 10000,
          "minimum": 0
        },
        "maxQuoteAgeSeconds": {
          "type": "number",
          "default": 10,
          "maximum": 3600,
          "minimum": 0
        },
        "minDepthCoveragePct": {
          "type": "number",
          "default": 100,
          "maximum": 100,
          "minimum": 0
        },
        "maxEstimatedSlippageBps": {
          "type": "number",
          "default": 25,
          "maximum": 10000,
          "minimum": 0
        },
        "maxCrossVenueDivergenceBps": {
          "type": "number",
          "default": 20,
          "maximum": 10000,
          "minimum": 0
        }
      },
      "description": "Execution policy for one intended USD-pair spot order.",
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}

delta_preflight — Gate a crypto order before submission

Advertised by the server during the last successful anonymous check.

Paid via x402 or MPP: $0.01 USDC on Base. Send the exact order venue, side, and size immediately before submission to obtain a signed PASS, BLOCK, or UNKNOWN from live availability, spread, freshness, depth, slippage, and divergence checks. Fail closed on BLOCK or UNKNOWN.

delta_preflight input schema

{
  "type": "object",
  "required": [
    "trade"
  ],
  "properties": {
    "trade": {
      "type": "object",
      "required": [
        "pair"
      ],
      "properties": {
        "pair": {
          "type": "string",
          "pattern": "^[A-Za-z0-9]{2,15}[-/_]USD$",
          "description": "USD spot pair, for example BTC-USD."
        },
        "side": {
          "enum": [
            "buy",
            "sell"
          ],
          "type": "string"
        },
        "venue": {
          "enum": [
            "coinbase",
            "gemini"
          ],
          "type": "string",
          "description": "Optional exact-order venue. Include with side and baseSize."
        },
        "baseSize": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "orderType": {
          "enum": [
            "market",
            "limit"
          ],
          "type": "string",
          "default": "market"
        },
        "limitPrice": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "minHealthyVenues": {
          "type": "number",
          "default": 2,
          "maximum": 2,
          "minimum": 1
        },
        "maxVenueSpreadBps": {
          "type": "number",
          "default": 10,
          "maximum": 10000,
          "minimum": 0
        },
        "maxQuoteAgeSeconds": {
          "type": "number",
          "default": 10,
          "maximum": 3600,
          "minimum": 0
        },
        "minDepthCoveragePct": {
          "type": "number",
          "default": 100,
          "maximum": 100,
          "minimum": 0
        },
        "maxEstimatedSlippageBps": {
          "type": "number",
          "default": 25,
          "maximum": 10000,
          "minimum": 0
        },
        "maxCrossVenueDivergenceBps": {
          "type": "number",
          "default": 20,
          "maximum": 10000,
          "minimum": 0
        }
      },
      "description": "Execution policy for one intended USD-pair spot order.",
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 380 ms
95th percentile latency: 380 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 7, 2026, 9:18 AM UTC · probe · passed · 380 ms · metadata changed · 2 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http butterfly-delta-preflight-mcp https://butterflydelta.com/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add butterfly-delta-preflight-mcp --url https://butterflydelta.com/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable butterfly-delta-preflight-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "butterfly-delta-preflight-mcp": {
      "url": "https://butterflydelta.com/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "butterfly-delta-preflight-mcp": {
      "type": "streamableHttp",
      "url": "https://butterflydelta.com/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start butterfly-delta-preflight-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "butterfly-delta-preflight-mcp": {
      "type": "http",
      "url": "https://butterflydelta.com/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http butterfly-delta-preflight-mcp https://butterflydelta.com/api/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://butterflydelta.com/api/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "butterfly-delta-preflight-mcp": {
      "serverUrl": "https://butterflydelta.com/api/mcp"
    }
  }
}

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