Use when an agent needs a cited answer it can show its principal rather than a bare comple

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x970007590aCC5C938cd51345B17AF51B1B40D3Ab",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "650000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "GYyTRmt317JafPHXPnM54Fsvsma5GnS9wm6qGMqaykdS",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "650000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "question": "What is the x402 payment protocol?"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "answer": "x402 is an HTTP-native payment protocol: a server answers 402 with machine-readable terms, the client retries with a signed stablecoin payment, and a facilitator settles it on chain.",
          "confidence": "high",
          "disclaimer": null,
          "generated_at": "2026-09-12T00:00:00.000Z",
          "message": "Answer with sources via x402 protocol",
          "model": "deepseek/deepseek-v4-flash",
          "question": "What is the x402 payment protocol?",
          "sources": [
            {
              "title": "x402 protocol specification",
              "url": "https://github.com/coinbase/x402"
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "question": {
                  "description": "Question to answer with citations",
                  "type": "string"
                }
              },
              "required": [
                "question"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "answer": {
              "type": "string"
            },
            "confidence": {
              "type": "string"
            },
            "disclaimer": {
              "type": "null"
            },
            "generated_at": {
              "type": "string"
            },
            "message": {
              "type": "string"
            },
            "model": {
              "type": "string"
            },
            "question": {
              "type": "string"
            },
            "sources": {
              "items": {
                "properties": {
                  "title": {
                    "type": "string"
                  },
                  "url": {
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "type": "array"
            }
          },
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://api.oblique.markets/api/v1/paid/answer-with-sources"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.oblique.markets/api/v1/paid/answer-with-sources");
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://api.oblique.markets/api/v1/paid/answer-with-sources")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header