{
  "x402Version": 2,
  "id": 1139,
  "slug": "1139",
  "resource": "https://x402tap.com/api/prediction-arb",
  "description": "Find prediction-market questions priced differently on Polymarket vs. Kalshi — a cross-platform divergence signal built from data no single-platform competitor has",
  "type": "http",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:137",
      "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "amount": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:42161",
      "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "amount": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "9fqXniDAn8hNMYC5C9waGv5u126bkwjU6qGgAoQeoWyo",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "amount": "5000",
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "limit": "5",
            "minDivergencePct": "10"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "count": 1,
            "matches": [
              {
                "cheaperYesOn": "kalshi",
                "divergencePct": 12.4,
                "kalshi": {
                  "subTitle": null,
                  "ticker": "KXFED-99",
                  "title": "Fed cuts rates at September FOMC meeting?",
                  "yesProbability": 0.496
                },
                "matchScore": 0.5,
                "polymarket": {
                  "question": "Will the Fed cut rates in September?",
                  "slug": "example-market",
                  "volume24hr": 45678.9,
                  "yesProbability": 0.62
                }
              }
            ],
            "minDivergencePct": 10,
            "note": "Matches are found by keyword-overlap similarity...",
            "query": null
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "limit": {
                    "description": "Max matches to return, 1-25 (default 10)",
                    "type": "string"
                  },
                  "minDivergencePct": {
                    "description": "Minimum probability-point divergence to include, 0-100 (default 5)",
                    "type": "string"
                  },
                  "q": {
                    "description": "Optional keyword filter on the matched question text",
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    },
    "offer-receipt": {
      "info": {
        "offers": [
          {
            "acceptIndex": 0,
            "format": "eip712",
            "payload": {
              "amount": "5000",
              "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "network": "eip155:8453",
              "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
              "resourceUrl": "https://x402tap.com/api/prediction-arb",
              "scheme": "exact",
              "validUntil": 1788857082,
              "version": 1
            },
            "signature": "0xa347d3587c99f4fda8784705a19f157713514a6ea9da7eeca01176353bc67e1706ea50b09d0a12a5fcb62fbb89956ab2191ac5b865ccc1c38df4ed1723b9bef01b"
          },
          {
            "acceptIndex": 1,
            "format": "eip712",
            "payload": {
              "amount": "5000",
              "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
              "network": "eip155:137",
              "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
              "resourceUrl": "https://x402tap.com/api/prediction-arb",
              "scheme": "exact",
              "validUntil": 1788857082,
              "version": 1
            },
            "signature": "0x73c14a39b4d24d89b23756c856f0352986d5c53dac97d2cec578a09c523e7a551e8bcc693a80cf56442d081f3fb7595756beb7f57fb3ec27421ab4abf746c4971b"
          },
          {
            "acceptIndex": 2,
            "format": "eip712",
            "payload": {
              "amount": "5000",
              "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
              "network": "eip155:42161",
              "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
              "resourceUrl": "https://x402tap.com/api/prediction-arb",
              "scheme": "exact",
              "validUntil": 1788857082,
              "version": 1
            },
            "signature": "0x232c972f634ba84264282173dae10d8498e55595583e9c9319c597bc9a348d2a0b7e6e29de0ec19e4fb84073afaf302fdd50bfd06880296ee096b695a7612fe11b"
          },
          {
            "acceptIndex": 3,
            "format": "eip712",
            "payload": {
              "amount": "5000",
              "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
              "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
              "payTo": "9fqXniDAn8hNMYC5C9waGv5u126bkwjU6qGgAoQeoWyo",
              "resourceUrl": "https://x402tap.com/api/prediction-arb",
              "scheme": "exact",
              "validUntil": 1788857082,
              "version": 1
            },
            "signature": "0x105064b7c59e495a15c29a3cde091c470407dc49688793e8958d9f2abaff2fce27fc79eff6806d341a3d2f763f3fe5ea39756bc38f5b4ce328a1526e51bf62071b"
          }
        ]
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "offers": {
            "items": {
              "properties": {
                "acceptIndex": {
                  "type": "integer"
                },
                "format": {
                  "type": "string"
                },
                "payload": {
                  "properties": {
                    "amount": {
                      "type": "string"
                    },
                    "asset": {
                      "type": "string"
                    },
                    "network": {
                      "type": "string"
                    },
                    "payTo": {
                      "type": "string"
                    },
                    "resourceUrl": {
                      "type": "string"
                    },
                    "scheme": {
                      "type": "string"
                    },
                    "validUntil": {
                      "type": "integer"
                    },
                    "version": {
                      "type": "integer"
                    }
                  },
                  "required": [
                    "version",
                    "resourceUrl",
                    "scheme",
                    "network",
                    "asset",
                    "payTo",
                    "amount"
                  ],
                  "type": "object"
                },
                "signature": {
                  "type": "string"
                }
              },
              "required": [
                "format",
                "signature"
              ],
              "type": "object"
            },
            "type": "array"
          }
        },
        "required": [
          "offers"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "bazaar",
    "offer-receipt"
  ],
  "sourceHost": "x402tap.com",
  "lastUpdated": "2026-09-08T08:39:42.69Z",
  "quality": {
    "calls30d": 3,
    "uniquePayers30d": 3,
    "lastCalledAt": "2026-09-08T08:39:42.456Z"
  },
  "liveness": {},
  "verified": false,
  "featured": false,
  "provider": {
    "host": "x402tap.com",
    "manifest_name": "x402tap.com",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-09-18T22:00:31.484Z"
  }
}