{
  "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"
  },
  "tool": {
    "category": "",
    "endpoint": "https://api.crosswire-api.com/mcp",
    "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.json",
    "kind": "mcp",
    "listed": "indexed",
    "liveUrl": "https://www.anchorterminal.com/api/v1/live/crosswire-api-crosswire-polymarket-kalshi-arbitrage.json",
    "markdownUrl": "https://www.anchorterminal.com/tools/crosswire-api-crosswire-polymarket-kalshi-arbitrage.md",
    "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"
    ]
  }
}