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      "endpoint": "https://api.crosswire-api.com/mcp",
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      "kind": "mcp",
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      "mcpTools": {
        "check": {
          "checker": "anchor-check/1.0",
          "totalTokens": 1430,
          "counts": {
            "error": 0,
            "note": 0,
            "warn": 0
          },
          "findings": []
        },
        "checkedAt": "2026-10-04T22:22:29Z",
        "count": 2,
        "schemaTokens": 1430,
        "status": "ok",
        "tools": [
          {
            "name": "check_resolution_risk",
            "description": "Pre-trade safety check for cross-venue event markets (crypto\noracle-divergence pairs, metered; World Cup football, free). Flags\nresolution mismatches, void-rule divergence, scope differences\n(e.g. 90-minute vs extra-time; matched vs differing strike),\nsettlement-source and -timing gaps, stale data, and thin liquidity\nbetween the two Polymarket and Kalshi legs BEFORE you execute both.\nReturns a machine-readable verdict — execution_verdict:\nsafe / caution / block — inside a full Fungibility \u0026 Settlement Audit Object\n(FSAO) with structured findings, top-level divergence flags, venue\nrule overrides, fee-adjusted spread, and verdict reasons. Identify the\npair by EITHER canonical_event_id (a live pair id from\nlist_covered_events — the metered 'crypto:' inventory rolls daily, so\nfetch a current id there rather than reusing an old one; the free 'wc26:'\nWorld Cup pairs are stable) OR market_a + market_b (one Polymarket\nconditionId + one Kalshi ticker, order-insensitive). If the pair is not\ncovered, returns a non-error\ncoverage reply (covered: false) naming the covered inventories (free\nWorld Cup football + metered crypto pairs) and the coverage cutoff\ninstead of an FSAO.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {
                "api_key": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null,
                  "description": "Crosswire API key (cw_…). Optional. Free for the World Cup graph and the first calls/day on metered crypto pairs; beyond that, metered crypto calls draw down this key's prepaid USDC balance (top up via the x402 /v1/credits/topup endpoint)."
                },
                "canonical_event_id": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null,
                  "description": "A covered pair id — the outcome-suffixed canonical id. Two namespaces: the metered crypto oracle-divergence inventory (shape 'crypto:btc-above:\u003cdate\u003e:strike-\u003cn\u003e#above' — $0.02 USDC per call after 3 free calls/day; the daily pair rolls, so fetch a current id from list_covered_events rather than reusing an old one) and the free World Cup football pairs (shape 'wc26:match:\u003cTEAMS\u003e:\u003cdate\u003e:result#home|#draw|#away'; the suffix selects the outcome leg-pair). A bare event id without the suffix is ambiguous and only accepted when market_a + market_b are also given to select the leg. Always get live pair ids from list_covered_events."
                },
                "market_a": {
                  "anyOf": [
                    {
                      "description": "One outcome leg on one venue (mirrors the REST `AuditRequest` refs).",
                      "properties": {
                        "market_id": {
                          "description": "Venue-native market id: Polymarket conditionId (0x… hex) or Kalshi market ticker (e.g. 'KXWCGAME-26JUN11MEXRSA-MEX').",
                          "type": "string"
                        },
                        "outcome": {
                          "anyOf": [
                            {
                              "type": "string"
                            },
                            {
                              "type": "null"
                            }
                          ],
                          "default": null,
                          "description": "Venue-native outcome label. Optional — pair matching uses only (venue, market_id); when omitted the venue's binary book key ('Yes' on Polymarket, 'yes' on Kalshi) is assumed."
                        },
                        "side": {
                          "anyOf": [
                            {
                              "type": "string"
                            },
                            {
                              "type": "null"
                            }
                          ],
                          "default": null,
                          "description": "'yes' | 'no' if applicable. Optional, informational."
                        },
                        "venue": {
                          "description": "The venue: 'polymarket' or 'kalshi'.",
                          "enum": [
                            "polymarket",
                            "kalshi"
                          ],
                          "type": "string"
                        }
                      },
                      "required": [
                        "venue",
                        "market_id"
                      ],
                      "type": "object"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null,
                  "description": "First leg of the pair to audit (either venue; order does not matter). Provide market_a AND market_b together, or use canonical_event_id instead."
                },
                "market_b": {
                  "anyOf": [
                    {
                      "description": "One outcome leg on one venue (mirrors the REST `AuditRequest` refs).",
                      "properties": {
                        "market_id": {
                          "description": "Venue-native market id: Polymarket conditionId (0x… hex) or Kalshi market ticker (e.g. 'KXWCGAME-26JUN11MEXRSA-MEX').",
                          "type": "string"
                        },
                        "outcome": {
                          "anyOf": [
                            {
                              "type": "string"
                            },
                            {
                              "type": "null"
                            }
                          ],
                          "default": null,
                          "description": "Venue-native outcome label. Optional — pair matching uses only (venue, market_id); when omitted the venue's binary book key ('Yes' on Polymarket, 'yes' on Kalshi) is assumed."
                        },
                        "side": {
                          "anyOf": [
                            {
                              "type": "string"
                            },
                            {
                              "type": "null"
                            }
                          ],
                          "default": null,
                          "description": "'yes' | 'no' if applicable. Optional, informational."
                        },
                        "venue": {
                          "description": "The venue: 'polymarket' or 'kalshi'.",
                          "enum": [
                            "polymarket",
                            "kalshi"
                          ],
                          "type": "string"
                        }
                      },
                      "required": [
                        "venue",
                        "market_id"
                      ],
                      "type": "object"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null,
                  "description": "Second leg of the pair to audit (the other venue)."
                },
                "mode": {
                  "default": "advisory",
                  "description": "'advisory' (default) or 'strict'.",
                  "type": "string"
                },
                "notional_usd": {
                  "anyOf": [
                    {
                      "type": "number"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null,
                  "description": "Intended position size in USD. Optional; sizes the thin-liquidity check against live top-of-book depth."
                }
              },
              "type": "object"
            },
            "outputSchema": {
              "additionalProperties": true,
              "type": "object"
            },
            "annotations": {
              "readOnlyHint": true
            }
          },
          {
            "name": "list_covered_events",
            "description": "Free discovery of everything check_resolution_risk can audit across\nboth inventories — the free World Cup football pairs and the metered\ncrypto oracle-divergence pairs (the 'crypto:' namespace is the paid\nsurface: $0.02 USDC per call after 3 free calls/day). Returns the\ncovered canonical events, their per-outcome pair ids (…#home / #draw /\n#away for football), the Polymarket conditionIds and Kalshi tickers\nwith outcome labels for each pair, match dates, the frozen ruleset_sha\npinning the identity graph, the coverage kickoff cutoff, and snapshot\nfreshness. Use a returned pair_id (or a pair's two market ids) as input\nto check_resolution_risk.",
            "inputSchema": {
              "additionalProperties": false,
              "properties": {},
              "type": "object"
            },
            "outputSchema": {
              "additionalProperties": true,
              "type": "object"
            },
            "annotations": {
              "readOnlyHint": true
            }
          }
        ]
      },
      "name": "Crosswire — Polymarket \u0026 Kalshi Arbitrage",
      "note": "Indexed from the official MCP registry: facts and our own checks, not reviewed, so no score, grade or rank.",
      "packages": null,
      "pageJsonUrl": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.json",
      "popularity": {
        "githubStars": 1
      },
      "registryName": "com.crosswire-api/crosswire-polymarket-kalshi-arbitrage",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://api.crosswire-api.com/mcp"
        }
      ],
      "repository": "https://github.com/NicolasDuarte04/crosswire-mcp",
      "reviewed": false,
      "slug": "crosswire-api-crosswire-polymarket-kalshi-arbitrage",
      "source": "the official MCP registry",
      "sourceUrl": "https://registry.modelcontextprotocol.io/v0.1/servers?search=com.crosswire-api/crosswire-polymarket-kalshi-arbitrage",
      "summary": "Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk \u0026 settlement divergence.",
      "updatedAt": "2026-06-21T16:50:22Z",
      "url": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage",
      "vendor": "crosswire-api.com",
      "vendorUrl": "https://crosswire-api.com",
      "version": "0.6.2",
      "websiteUrl": "https://crosswire-api.com",
      "where": "hosted",
      "why": [
        "vendor"
      ]
    }
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    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage",
    "json": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.md",
    "slim": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.min.md"
  },
  "markdown": "# Crosswire — Polymarket \u0026 Kalshi Arbitrage\n\n\u003e Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/\n\n- Kind: MCP server, by crosswire-api.com (https://crosswire-api.com)\n- Listed because: It's published in the registry under crosswire-api.com, a namespace the registry only gives to whoever proves they control that domain.\n- What the official MCP registry says: Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk \u0026 settlement divergence.\n\n## Facts\n\n- MCP registry: `com.crosswire-api/crosswire-polymarket-kalshi-arbitrage` 0.6.2\n- Endpoint: https://api.crosswire-api.com/mcp (streamable HTTP)\n- Source: https://github.com/NicolasDuarte04/crosswire-mcp\n- Website: https://crosswire-api.com\n- GitHub stars: 1\n- Registry entry updated: 2026-06-21\n\n## Tools\n\n- Tools it lists (2, about 1,430 tokens of context, `tools/list` without credentials over MCP 2025-11-25, checked 2026-10-04 22:22 UTC):\n  - `check_resolution_risk` (read-only): Pre-trade safety check for cross-venue event markets (crypto oracle-divergence pairs, metered; World Cup football, free). Flags resolution mismatches,…\n  - `list_covered_events` (read-only): Free discovery of everything check_resolution_risk can audit across both inventories — the free World Cup football pairs and the metered crypto…\n- How its tools read to an agent (0 errors, 0 warnings, 0 notes, about 1,430 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):\n\n- JSON: https://www.anchorterminal.com/api/v1/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.json\n- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-04",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run"
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        "name": "Crosswire — Polymarket \u0026 Kalshi Arbitrage",
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    ],
    "description": "Crosswire — Polymarket \u0026 Kalshi Arbitrage, an MCP server by crosswire-api.com, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk \u0026 settlement…",
    "facts": [
      "not reviewed",
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    "h1": "Crosswire — Polymarket \u0026 Kalshi Arbitrage",
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    "title": "Crosswire — Polymarket \u0026 Kalshi Arbitrage | Anchor Terminal",
    "toc": null,
    "updated": "2026-10-04",
    "url": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage"
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  "tokens": {
    "markdown": 650,
    "slim": 580
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