Cheapest LLM meeting your constraints (price/context/modality) PLUS every price change and

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x6D7a2D65B26a87134c0571fb1baaA248eB0a291B",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "50000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "discoverable": true,
        "method": "GET",
        "queryParams": {
          "max_prompt_price": 0.000001,
          "min_context": 128000,
          "modality": "text",
          "window_s": 604800
        },
        "type": "http"
      },
      "output": {
        "example": {
          "charged": true,
          "results": {
            "candidates": [
              {
                "context": 512000,
                "model": "vendor/model",
                "price_prompt": 0
              }
            ],
            "deprecations": [],
            "matching_count": 364,
            "price_changes_in_window": []
          }
        },
        "format": "application/json",
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "charged": {
              "description": "Whether payment settled for this call.",
              "type": "boolean"
            },
            "provenance": {
              "description": "Where the data came from and under what terms.",
              "properties": {
                "cadence_s": {
                  "description": "Seconds between observations.",
                  "type": [
                    "integer",
                    "null"
                  ]
                },
                "dataset": {
                  "type": "string"
                },
                "license": {
                  "description": "public: raw values redistributable. derived_only: only computed analytics are served. internal: never served.",
                  "enum": [
                    "public",
                    "derived_only",
                    "internal"
                  ],
                  "type": "string"
                },
                "method": {
                  "type": "string"
                },
                "source": {
                  "description": "Upstream API or feed.",
                  "type": "string"
                }
              },
              "type": "object"
            },
            "results": {
              "description": "Ranked candidates plus the changes affecting them.",
              "properties": {
                "candidates": {
                  "items": {
                    "properties": {
                      "context": {
                        "description": "Tokens.",
                        "type": "integer"
                      },
                      "model": {
                        "type": "string"
                      },
                      "price_prompt": {
                        "description": "USD per prompt token.",
                        "type": "number"
                      }
                    },
                    "type": "object"
                  },
                  "type": "array"
                },
                "deprecations": {
                  "items": {
                    "type": "object"
                  },
                  "type": "array"
                },
                "matching_count": {
                  "type": "integer"
                },
                "price_changes_in_window": {
                  "items": {
                    "type": "object"
                  },
                  "type": "array"
                }
              },
              "type": "object"
            }
          },
          "required": [
            "results"
          ],
          "type": "object"
        },
        "type": "object"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "max_prompt_price": {
                  "description": "Max USD PER PROMPT TOKEN (not per million).",
                  "type": "number"
                },
                "min_context": {
                  "default": 0,
                  "description": "Minimum context window in TOKENS.",
                  "type": "integer"
                },
                "modality": {
                  "description": "Substring of the modality string, e.g. text or image.",
                  "type": "string"
                },
                "window_s": {
                  "default": 604800,
                  "description": "Change look-back in SECONDS.",
                  "type": "integer"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://anansidata.xyz/paid/intel/model-advisor"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://anansidata.xyz/paid/intel/model-advisor");
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://anansidata.xyz/paid/intel/model-advisor")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header