Cross-exchange cryptocurrency arbitrage opportunities

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x24FAcafEB49b4e3FACF0B3e69604A2F4640c9bf2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "description": "Cross-exchange crypto arbitrage from CoinGecko. Identifies price spreads for crypto assets across major exchanges (Binance, Coinbase, Kraken, etc.) for USD/USDT/USDC pairs.",
      "iconUrl": "https://memoryapi.org/icon.png",
      "input": {
        "method": "GET",
        "queryParams": {
          "coin": "bitcoin",
          "coins": "bitcoin,ethereum,solana",
          "limit": "10"
        },
        "schema": {
          "properties": {
            "coin": {
              "description": "Single coin to analyze (default: bitcoin)",
              "type": "string"
            },
            "coins": {
              "description": "Comma-separated list for multiple coins (e.g. bitcoin,ethereum,solana)",
              "type": "string"
            },
            "limit": {
              "description": "Max exchanges to return (default: 10, max: 50)",
              "type": "integer"
            }
          },
          "required": []
        },
        "type": "http"
      },
      "output": {
        "example": {
          "all_exchanges": [
            {
              "name": "Binance",
              "price": 42600.75,
              "target_currency": "USDT"
            }
          ],
          "as_of": "2025-01-02T18:00:00Z",
          "best_buy": {
            "exchange": "Kraken",
            "price": 42300.5
          },
          "best_sell": {
            "exchange": "Binance",
            "price": 42600.75
          },
          "coin": "bitcoin",
          "signal": "ARBITRAGE",
          "source": "CoinGecko",
          "spread_pct": 0.7102,
          "spread_usd": 300.25,
          "success": true
        }
      },
      "serviceName": "MemoryAPI Market",
      "tags": [
        "finance",
        "stocks",
        "crypto",
        "market"
      ]
    },
    "schema": {
      "properties": {
        "input": {
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            }
          },
          "required": [
            "method"
          ]
        }
      }
    }
  }
}

curl "https://market.memoryapi.org/x402/market/cex_arb"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://market.memoryapi.org/x402/market/cex_arb");
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://market.memoryapi.org/x402/market/cex_arb")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header