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mirrored listing x402 eip155:8453

Verify a legal case citation: does it exist, and does the given case name match the canoni

Verify a legal case citation: does it exist, and does the given case name match the canonical record? Catches a fabricated case citation, including a real-looking citation number paired with an invented case name. Checked against CourtListener. Does not check whether a case is still good law -- no free authoritative source publishes that.

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10000 (raw units)
price
5
calls / 30d
1
unique payers
2026-09-04
updated

Provider

goodsong.dev · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "case_name": "Obergefell v. Hodges",
          "citation": "576 U.S. 644"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "canonical": {
            "absolute_url": "/opinion/2812209/obergefell-v-hodges/",
            "case_name": "Obergefell v. Hodges",
            "date_filed": "2015-06-26"
          },
          "checks": {
            "case_name_match": true,
            "exists": true
          },
          "cost": {
            "amount": "0.01",
            "currency": "USDC"
          },
          "evidence": [
            {
              "retrieved_at": "2026-08-30T12:00:00Z",
              "source": "courtlistener",
              "url": "https://www.courtlistener.com/api/rest/v4/citation-lookup/"
            }
          ],
          "latency_ms": 220,
          "verdict": "confirmed"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "description": "Provide a citation; case_name is optional and checked against the canonical record when given.",
              "properties": {
                "case_name": {
                  "description": "Optional case name to cross-check against the citation.",
                  "type": "string"
                },
                "citation": {
                  "description": "The case citation, e.g. '576 U.S. 644'.",
                  "type": "string"
                }
              },
              "required": [
                "citation"
              ]
            },
            "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": {
            "example": {
              "properties": {
                "canonical": {
                  "type": [
                    "object",
                    "null"
                  ]
                },
                "checks": {
                  "type": "object"
                },
                "cost": {
                  "type": "object"
                },
                "evidence": {
                  "type": "array"
                },
                "latency_ms": {
                  "type": "integer"
                },
                "verdict": {
                  "enum": [
                    "confirmed",
                    "contradicted",
                    "unknown"
                  ],
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://goodsong.dev/verify/case"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://goodsong.dev/verify/case");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://goodsong.dev/verify/case")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/7667.json, and this resource appears in /discovery/resources and /discovery/search.