Execute instant same-chain token swaps through LI.FI's DEX aggregation

Execute instant same-chain token swaps through LI.FI's DEX aggregation. Supports Base, Ethereum, Polygon, BSC, Arbitrum, Avalanche, and Solana, with best-route execution across major DEXes and liquidity sources.

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Endpoint

POST https://x402.ottoai.services/swap

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Example input (from the provider)

{
  "body": {
    "amount": 10,
    "chainId": 8453,
    "fromSymbol": "USDC",
    "toSymbol": "WETH"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "properties": {
            "amount": {
              "description": "Amount of the FROM token to sell (human-readable, e.g. 10.5). Decimals are derived server-side \u2014 do NOT send fromDecimals/toDecimals.",
              "type": "number"
            },
            "chainId": {
              "description": "Chain ID: 1 (ETH), 56 (BSC), 137 (Polygon), 8453 (Base, default), 42161 (Arbitrum), 43114 (Avalanche), 1151111081099710 (Solana)",
              "type": "number"
            },
            "deliverToButler": {
              "description": "If true, forward swapped tokens to user's main wallet after swap (default: false, keeps in Safe)",
              "type": "boolean"
            },
            "fromSymbol": {
              "description": "FROM token: a known symbol (e.g. USDC, WETH) OR a 0x contract address, resolved on the given chain. Ambiguous symbols are rejected (HTTP 400) with candidate addresses \u2014 send the address to disambiguate.",
              "type": "string"
            },
            "fromTokenAddress": {
              "description": "FROM token contract address (alternative to fromSymbol; RECOMMENDED to avoid symbol ambiguity). If both are sent and they resolve to different tokens, the request is rejected.",
              "type": "string"
            },
            "maxSlippagePercent": {
              "description": "Optional override for slippage tolerance (default 5%)",
              "type": "number"
            },
            "toSymbol": {
              "description": "TO token: a known symbol (e.g. WETH, USDC \u2014 use WETH, not native ETH) OR a 0x contract address, resolved on the given chain. Ambiguous symbols are rejected with candidates.",
              "type": "string"
            },
            "toTokenAddress": {
              "description": "TO token contract address (alternative to toSymbol; RECOMMENDED).",
              "type": "string"
            },
            "tokenSource": {
              "description": "Where to source input tokens: butler_wallet (pull all), otto_safe (Safe only), auto (default)",
              "enum": [
                "butler_wallet",
                "otto_safe",
                "auto"
              ],
              "type": "string"
            }
          },
          "required": [
            "fromSymbol",
            "toSymbol",
            "amount"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "amountIn": {
              "description": "In the token's smallest unit",
              "type": "string"
            },
            "amountOut": {
              "description": "Present once final. In the token's smallest unit",
              "type": "string"
            },
            "entryPrice": {
              "description": "Present once final",
              "type": "number"
            },
            "finality": {
              "type": "string"
            },
            "safeAddress": {
              "type": "string"
            },
            "status": {
              "type": "string"
            },
            "txHash": {
              "type": "string"
            },
            "userOpHash": {
              "type": "string"
            }
          },
          "required": [
            "status"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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