Spread Paywall API

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": "0xD7CDd563e8F6A249B076A702b7e2C233CCF3481d",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
        "transactionVersions": [
          0,
          1
        ]
      },
      "payTo": "E21AWkUtLz4BP7AaT82CF7v86Kmv4YzN4NAR1FQnEmqy",
      "amount": "50000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://workspace-x402-paywall.onrender.com/brief/topic",
    "tags": [
      "data",
      "api",
      "x402"
    ],
    "mimeType": "application/json",
    "description": "One-call topic brief for agents: live prediction-market prices for the topic on Polymarket and Kalshi, the SEC EDGAR company record when the topic is a listed company, a spot price when the topic is a major crypto asset, and a short encyclopedia context - replaces a search session with a single call",
    "serviceName": "Spread Paywall API"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "q": "example"
          }
        },
        "output": {
          "example": {
            "as_of": "2026-10-28T14:00:00.000Z",
            "topic": "fed",
            "crypto": null,
            "company": null,
            "context": "The Federal Open Market Committee sets the target range for the federal funds rate…",
            "prediction_markets": {
              "kalshi": [
                {
                  "yes": 0.66,
                  "title": "Fed funds rate after the December meeting",
                  "series": "KXFEDEND",
                  "top_outcome": "Above 4.00%"
                }
              ],
              "polymarket": [
                {
                  "yes": 0.68,
                  "title": "Will the Fed cut rates in December?",
                  "volume": 1523400
                }
              ]
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "q"
                ],
                "properties": {
                  "q": {
                    "type": "string",
                    "description": "Topic keyword or ticker (e.g. fed, trump, NVDA, bitcoin)"
                  }
                }
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 2,
  "sample_output": {
    "as_of": "<ISO timestamp>",
    "topic": "<query>",
    "crypto": "<spot price or null>",
    "company": "<EDGAR record or null>",
    "context": "<short text or null>",
    "prediction_markets": {
      "kalshi": [
        {
          "yes": "<0-1>",
          "title": "<event title>",
          "series": "<series ticker>",
          "top_outcome": "<outcome>"
        }
      ],
      "polymarket": [
        {
          "yes": "<0-1>",
          "title": "<event title>",
          "volume": "<number>"
        }
      ]
    }
  }
}

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": "0xD7CDd563e8F6A249B076A702b7e2C233CCF3481d",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
      "transactionVersions": [
        0,
        1
      ]
    },
    "payTo": "E21AWkUtLz4BP7AaT82CF7v86Kmv4YzN4NAR1FQnEmqy",
    "amount": "50000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "q": "example"
        }
      },
      "output": {
        "example": {
          "as_of": "2026-10-28T14:00:00.000Z",
          "topic": "fed",
          "crypto": null,
          "company": null,
          "context": "The Federal Open Market Committee sets the target range for the federal funds rate…",
          "prediction_markets": {
            "kalshi": [
              {
                "yes": 0.66,
                "title": "Fed funds rate after the December meeting",
                "series": "KXFEDEND",
                "top_outcome": "Above 4.00%"
              }
            ],
            "polymarket": [
              {
                "yes": 0.68,
                "title": "Will the Fed cut rates in December?",
                "volume": 1523400
              }
            ]
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "q"
              ],
              "properties": {
                "q": {
                  "type": "string",
                  "description": "Topic keyword or ticker (e.g. fed, trump, NVDA, bitcoin)"
                }
              }
            }
          },
          "additionalProperties": false
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-11-08 07:17Z

Last indexed by Roundhouse

2026-11-13 19:20Z

Last enriched (probe, favicon, geo)

2026-11-08 22:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402