DEX Swap Quote

Recent payments · which agents last used it

Every indexed settlement paid to this service’s wallet, newest first. The index does not record which endpoint a payment was for, so if this wallet serves more than one endpoint, the rows include payments for the others. Paged up to the newest 5,000; the full history is on the merchant page.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change. Always read the 402 the endpoint answers with.

{
  "error": "payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
      "amount": "30000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://x402.professorsausages.com/swap-quote/quote/:chain/:tokenIn/:tokenOut",
    "tags": [
      "swap",
      "dex",
      "price",
      "uniswap",
      "base"
    ],
    "mimeType": "application/json",
    "description": "DEX swap price quote — indicative UniswapV2 amount-out, price & price-impact for any token pair from live on-chain reserves on Base/Ethereum",
    "serviceName": "DEX Swap Quote"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "pool": "Explicit UniswapV2 pair address to quote against (skips factory lookup).",
            "amount": "Human units of tokenIn to quote (default 1)."
          }
        },
        "output": {
          "oneOf": [
            {
              "type": "object",
              "required": [
                "found",
                "chain",
                "tokenIn",
                "tokenOut",
                "amountIn",
                "amountOut",
                "price",
                "price_impact_pct",
                "pool",
                "dex",
                "fee_pct",
                "as_of_block",
                "disclaimer"
              ],
              "properties": {
                "dex": {
                  "enum": [
                    "uniswap-v2"
                  ],
                  "type": "string"
                },
                "pool": {
                  "type": "string",
                  "description": "The UniswapV2 pair address quoted against."
                },
                "chain": {
                  "type": "string"
                },
                "found": {
                  "enum": [
                    true
                  ],
                  "type": "boolean"
                },
                "price": {
                  "type": "number",
                  "description": "tokenOut per tokenIn at the realized rate."
                },
                "fee_pct": {
                  "enum": [
                    0.3
                  ],
                  "type": "number"
                },
                "tokenIn": {
                  "type": "string"
                },
                "amountIn": {
                  "type": "string",
                  "description": "Human units of tokenIn (echoes request)."
                },
                "tokenOut": {
                  "type": "string"
                },
                "amountOut": {
                  "type": "string",
                  "description": "Human units of tokenOut after the 0.3% fee."
                },
                "disclaimer": {
                  "type": "string"
                },
                "as_of_block": {
                  "type": "string",
                  "description": "Block height reserves were read at."
                },
                "price_impact_pct": {
                  "type": "number",
                  "description": "% the trade moves price away from the pool spot price."
                }
              }
            },
            {
              "type": "object",
              "required": [
                "found",
                "chain",
                "tokenIn",
                "tokenOut",
                "reason",
                "weth",
                "disclaimer"
              ],
              "properties": {
                "weth": {
                  "type": "string",
                  "description": "Chain WETH — a common routing hop (v2)."
                },
                "chain": {
                  "type": "string"
                },
                "found": {
                  "enum": [
                    false
                  ],
                  "type": "boolean"
                },
                "reason": {
                  "type": "string"
                },
                "tokenIn": {
                  "type": "string"
                },
                "tokenOut": {
                  "type": "string"
                },
                "disclaimer": {
                  "type": "string"
                }
              }
            }
          ]
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object"
          },
          "output": {
            "type": "object"
          }
        }
      },
      "category": "defi",
      "routeTemplate": "https://x402.professorsausages.com/swap-quote/quote/:chain/:tokenIn/:tokenOut"
    },
    "sample": {
      "url": "https://x402.professorsausages.com/swap-quote/sample",
      "hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
    },
    "catalog": {
      "message": "21 more agent-ready APIs you can call the same way (x402 pay-per-call). Full free catalog at the catalog URL; each serves a FREE real sample record (freeSample link) — taste before you pay. A few you might want:",
      "services": [
        {
          "call": "/token-safety?ref=xsell&v=menu&from=swap-quote",
          "name": "Token Safety Check",
          "summary": "On-chain token risk screening for agents",
          "freeSample": "/token-safety/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/address-screen?ref=xsell&v=menu&from=swap-quote",
          "name": "Address Risk Screen",
          "summary": "Crypto address risk screening for agents",
          "freeSample": "/address-screen/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/sanctions-screen?ref=xsell&v=menu&from=swap-quote",
          "name": "OFAC Sanctions Name Screen",
          "summary": "Fuzzy OFAC name screening for agents with compliance duties",
          "freeSample": "/sanctions-screen/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/gas-oracle?ref=xsell&v=menu&from=swap-quote",
          "name": "Multichain Gas Oracle",
          "summary": "Live multi-chain gas oracle for on-chain agents",
          "freeSample": "/gas-oracle/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/ens-resolve?ref=xsell&v=menu&from=swap-quote",
          "name": "ENS Resolver",
          "summary": "Spoof-safe ENS resolution for on-chain agents",
          "freeSample": "/ens-resolve/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/sec-10k?ref=xsell&v=menu&from=swap-quote",
          "name": "SEC Annual Report (10-K)",
          "summary": "U.S",
          "freeSample": "/sec-10k/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/sec-10q?ref=xsell&v=menu&from=swap-quote",
          "name": "SEC Quarterly Report (10-Q)",
          "summary": "U.S",
          "freeSample": "/sec-10q/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/sec-8k?ref=xsell&v=menu&from=swap-quote",
          "name": "SEC Current Report (8-K)",
          "summary": "U.S",
          "freeSample": "/sec-8k/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/insider-trades?ref=xsell&v=menu&from=swap-quote",
          "name": "Insider Trades",
          "summary": "SEC Form 4 insider transactions made agent-ready — who's buying and selling their own company's stock, norm…",
          "freeSample": "/insider-trades/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/13f-holdings?ref=xsell&v=menu&from=swap-quote",
          "name": "13F Institutional Holdings",
          "summary": "What every institutional manager actually holds, made agent-ready — normalized SEC 13F-HR portfolios for ~8…",
          "freeSample": "/13f-holdings/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/macro?ref=xsell&v=menu&from=swap-quote",
          "name": "US Macro Indicators",
          "summary": "WIP / FREE (BETA) — currently free while data coverage and freshness are expanded; pricing returns once pro…",
          "freeSample": "/macro/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/patent?ref=xsell&v=menu&from=swap-quote",
          "name": "US Patent Search",
          "summary": "WIP / FREE (BETA) — currently free; the corpus is a small curated slice of landmark patents while the full…",
          "freeSample": "/patent/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/ipo-calendar?ref=xsell&v=menu&from=swap-quote",
          "name": "IPO Calendar",
          "summary": "The US IPO pipeline straight from SEC EDGAR — public domain, no paid feed",
          "freeSample": "/ipo-calendar/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/fx-rates?ref=xsell&v=menu&from=swap-quote",
          "name": "FX Reference Rates",
          "summary": "Daily reference FX rates for commerce and accounting agents",
          "freeSample": "/fx-rates/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/reader?ref=xsell&v=menu&from=swap-quote",
          "name": "Web Reader & Screenshot",
          "summary": "Give your agent a real browser",
          "freeSample": "/reader/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/convert?ref=xsell&v=menu&from=swap-quote",
          "name": "Document Convert (PDF/Image → Text)",
          "summary": "Document conversion tools for agents — hand over any PDF or image (public URL, base64, or raw POSTed bytes,…",
          "freeSample": "/convert/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/nft?ref=xsell&v=menu&from=swap-quote",
          "name": "NFT Insight (Scam Check, Owners)",
          "summary": "NFT collection intelligence for agents — Ethereum now, Base next",
          "freeSample": "/nft/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/sfx?ref=xsell&v=menu&from=swap-quote",
          "name": "8-bit SFX Generator",
          "summary": "Deterministic 8-bit sound-effect synthesis for agents — game-ready WAVs from a seed or preset in one paid c…",
          "freeSample": "/sfx/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/icons?ref=xsell&v=menu&from=swap-quote",
          "name": "Icon Search",
          "summary": "Inline SVG icons for agents building UIs without CDN access — CSP blocks icon CDNs and hand-drawn path data…",
          "freeSample": "/icons/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/pokemon?ref=xsell&v=menu&from=swap-quote",
          "name": "Pokemon API",
          "summary": "Pokemon knowledge base for agents",
          "freeSample": "/pokemon/sample?ref=xsell&v=menu&from=swap-quote"
        },
        {
          "call": "/minecraft?ref=xsell&v=menu&from=swap-quote",
          "name": "Minecraft Data",
          "summary": "Minecraft game data for agents — look up any block or item by name with properties, ids and metadata, list…",
          "freeSample": "/minecraft/sample?ref=xsell&v=menu&from=swap-quote"
        }
      ],
      "strategy": "menu",
      "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=menu&from=swap-quote"
    },
    "suggest": {
      "url": "https://x402.professorsausages.com/suggest",
      "hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
    },
    "discount": {
      "off": "50%",
      "hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
      "header": "X-Intent"
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying: a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
    "amount": "30000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "pool": "Explicit UniswapV2 pair address to quote against (skips factory lookup).",
          "amount": "Human units of tokenIn to quote (default 1)."
        }
      },
      "output": {
        "oneOf": [
          {
            "type": "object",
            "required": [
              "found",
              "chain",
              "tokenIn",
              "tokenOut",
              "amountIn",
              "amountOut",
              "price",
              "price_impact_pct",
              "pool",
              "dex",
              "fee_pct",
              "as_of_block",
              "disclaimer"
            ],
            "properties": {
              "dex": {
                "enum": [
                  "uniswap-v2"
                ],
                "type": "string"
              },
              "pool": {
                "type": "string",
                "description": "The UniswapV2 pair address quoted against."
              },
              "chain": {
                "type": "string"
              },
              "found": {
                "enum": [
                  true
                ],
                "type": "boolean"
              },
              "price": {
                "type": "number",
                "description": "tokenOut per tokenIn at the realized rate."
              },
              "fee_pct": {
                "enum": [
                  0.3
                ],
                "type": "number"
              },
              "tokenIn": {
                "type": "string"
              },
              "amountIn": {
                "type": "string",
                "description": "Human units of tokenIn (echoes request)."
              },
              "tokenOut": {
                "type": "string"
              },
              "amountOut": {
                "type": "string",
                "description": "Human units of tokenOut after the 0.3% fee."
              },
              "disclaimer": {
                "type": "string"
              },
              "as_of_block": {
                "type": "string",
                "description": "Block height reserves were read at."
              },
              "price_impact_pct": {
                "type": "number",
                "description": "% the trade moves price away from the pool spot price."
              }
            }
          },
          {
            "type": "object",
            "required": [
              "found",
              "chain",
              "tokenIn",
              "tokenOut",
              "reason",
              "weth",
              "disclaimer"
            ],
            "properties": {
              "weth": {
                "type": "string",
                "description": "Chain WETH — a common routing hop (v2)."
              },
              "chain": {
                "type": "string"
              },
              "found": {
                "enum": [
                  false
                ],
                "type": "boolean"
              },
              "reason": {
                "type": "string"
              },
              "tokenIn": {
                "type": "string"
              },
              "tokenOut": {
                "type": "string"
              },
              "disclaimer": {
                "type": "string"
              }
            }
          }
        ]
      }
    },
    "schema": {
      "type": "object",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      }
    },
    "category": "defi",
    "routeTemplate": "https://x402.professorsausages.com/swap-quote/quote/:chain/:tokenIn/:tokenOut"
  },
  "sample": {
    "url": "https://x402.professorsausages.com/swap-quote/sample",
    "hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
  },
  "catalog": {
    "message": "You called DEX Swap Quote. Agents doing defi work commonly also use these — same pay-per-call model, each with a FREE real sample record (freeSample link):",
    "related": [
      {
        "call": "/gas-oracle?ref=xsell&v=related&from=swap-quote",
        "name": "Multichain Gas Oracle",
        "summary": "Live multi-chain gas oracle for on-chain agents",
        "freeSample": "/gas-oracle/sample?ref=xsell&v=related&from=swap-quote"
      }
    ],
    "strategy": "related",
    "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=related&from=swap-quote"
  },
  "suggest": {
    "url": "https://x402.professorsausages.com/suggest",
    "hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
  },
  "discount": {
    "off": "50%",
    "hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
    "header": "X-Intent"
  }
}

Provenance

Seen in the source catalog

2026-07-20 23:42Z

Last indexed by Roundhouse

2026-08-08 05:20Z

Last enriched (probe, favicon, geo)

2026-09-24 20:15Z

x402 version

2

Max timeout

60s

Liveness probe

HTTP 400