APEX Runner: Arb Spread Signal

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x8D0663BBb967ebF1c047405A888DDf865f3E8854",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "7000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "category": "trading-signals",
    "description": "Cross-exchange arbitrage spread between Kraken and Hyperliquid for BTC and ETH. Returns live price spread %, net spread after fees, and arb viability flag for cross-exchange arbitrage execution.",
    "example": {
      "hl_price": 62380,
      "kraken_price": 62450,
      "pair": "BTC/USDC",
      "spread_pct": 0.11,
      "viable": false
    },
    "info": {
      "input": {
        "method": "GET",
        "type": "http"
      },
      "output": {
        "example": {
          "hl_price": 62380,
          "kraken_price": 62450,
          "pair": "BTC/USDC",
          "spread_pct": 0.11,
          "viable": false
        },
        "hl_price": "float — mid-price on Hyperliquid at time of snapshot",
        "kraken_price": "float — mid-price on Kraken at time of snapshot",
        "pair": "string — asset pair being compared (e.g. BTC/USDC)",
        "spread_pct": "float — gross spread as a percentage of price",
        "type": "json",
        "viable": "boolean — true when net spread exceeds estimated round-trip fees"
      }
    },
    "name": "Arb Spread Signal",
    "outputSchema": {
      "hl_price": "float",
      "kraken_price": "float",
      "pair": "string",
      "spread_pct": "float",
      "viable": "boolean"
    },
    "schema": {
      "properties": {
        "input": {
          "properties": {
            "queryParams": {
              "properties": {},
              "type": "object"
            }
          },
          "required": [
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "_apex": {
                  "properties": {
                    "evolution_runs": {
                      "type": "integer"
                    },
                    "instance": {
                      "type": "string"
                    },
                    "live_capital_deployed": {
                      "type": "boolean"
                    },
                    "live_trading": {
                      "type": "boolean"
                    },
                    "signal": {
                      "type": "string"
                    },
                    "signal_hash": {
                      "type": "string"
                    },
                    "source": {
                      "type": "string"
                    },
                    "trades_backing_signal": {
                      "type": "integer"
                    },
                    "verify_at": {
                      "type": "string"
                    },
                    "version": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "pairs": {
                  "additionalProperties": {
                    "properties": {
                      "action": {
                        "type": "string"
                      },
                      "arb_viable": {
                        "type": "boolean"
                      },
                      "cex_price": {
                        "type": "integer"
                      },
                      "direction": {
                        "type": "string"
                      },
                      "gross_spread_pct": {
                        "type": "number"
                      },
                      "hl_price": {
                        "type": "number"
                      },
                      "threshold_pct": {
                        "type": "number"
                      }
                    },
                    "type": "object"
                  },
                  "type": "object"
                }
              },
              "type": "object"
            }
          },
          "type": "object"
        }
      },
      "type": "object"
    },
    "version": "1.0.0"
  }
}

curl "https://apexrunner.ai/signals/arb-spread"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://apexrunner.ai/signals/arb-spread");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://apexrunner.ai/signals/arb-spread")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header