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Crosswire MCP server

Which MCP servers are Crosswire's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-24

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Whose server it is
  • Registry namecom.crosswire-api/crosswire-polymarket-kalshi-arbitrageverified in the MCP registry

The registry name sits under crosswire-api.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools2
  • Server calls itselfCrosswire
  • Server version0.6.1
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 207 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: check two market references before placing a cross-venue hedge; flag settlement source and timing divergences between venues; detect void-rule mismatches that leave one leg open.
  • Checked on 4 of the 7 days it takes to judge reliability.

Once connected

  • For "check two market references before placing a cross-venue hedge", the likely first call is check_resolution_risk.
  • For "flag settlement source and timing divergences between venues", the likely first call is check_resolution_risk.
  • For "detect void-rule mismatches that leave one leg open", the likely first call is check_resolution_risk.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • What an agent can do with it3 of 3 use cases
  • Use1 GitHub stars
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer157 ms
  • Space in an agent's context≈ 1,361 tokensthe definitions of all its tools (2), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results2 of 2 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · check two market references before placing a cross-venue hedge
  • can do · flag settlement source and timing divergences between venues
  • can do · detect void-rule mismatches that leave one leg open

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers2 tools · read 2026-10-24
  • check_resolution_risk

    Pre-trade safety check for cross-venue event markets (crypto oracle-divergence pairs, metered; World Cup football, free). Flags resolution mismatches, void-rule divergence, scope differences (e.g. 90-minute vs extra-time; matched vs…

  • list_covered_events

    Free discovery of everything check_resolution_risk can audit across both inventories — the free World Cup football pairs and the metered crypto oracle-divergence pairs (the 'crypto:' namespace is the paid surface: $0.02 USDC per call…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "crosswire-polymarket-kalshi-arbitrage": {
      "type": "http",
      "url": "https://api.crosswire-api.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http crosswire-api https://api.crosswire-api.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://api.crosswire-api.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.