2s Law Case Verify

x402

2s Law Case Verify is a paid API for AI agents from 2s.io, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Verifies legal case citations found in a block of text, returning structured metadata about each case and whether it is confirmed or unconfirmed

Price / call$0.006

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StatusUnknown

How this service works

The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.

Output

A JSON object with an array of case items (each with case metadata and verification status), a count of verified vs unverified citations, total matching rows upstream, and source provenance (provider name, URL, license).

Example use cases

Example prompt

“Can you check this legal brief for me and verify which case citations are real? Here's the text: 'In Smith v. Jones, 123 U.S. 456 (1999), the court held... see also Doe v. Roe, 789 F.2d 101 (5th Cir. 2003)...'”

Technical details

Endpoint

POSThttps://2s.io/api/law/case-verify

When to prefer

Use this endpoint when you need to programmatically verify that legal case citations embedded in a block of text are real and confirmed in an authoritative database, especially in automated legal document review, contract auditing, or brief validation workflows. Prefer this over manual search when processing large documents with many citations at once.

Side effects

Text too short (minLength:1 not met) — validation error
Text exceeds 30,000 character limit — request rejected
No recognizable case citations found in text — empty items array returned
Upstream case database unavailable — possible 5xx or degraded response
Payment not included or insufficient — 402 Payment Required

Input

{
  "text": "In Smith v. Jones, 123 U.S. 456 (1999), the court held that statutory interpretation requires careful analysis of legislative intent. See also Doe v. Roe, 789 F.2d 101 (5th Cir. 2003), which clarified the standard for summary judgment motions."
}

Schema · Request body

Field	Type	Description
text	string

Output

{
  "data": {
    "ok": true,
    "meta": {
      "input": "In Smith v. Jones, 123 U.S. 456 (1999), the court held that statutory interpretation requires careful analysis of legislative intent. See also Doe v. Roe, 789 F.2d 101 (5th Cir. 2003), which clarified…",
      "verified": 1,
      "unverified": 1
    },
    "items": [
      {
        "case": null,
        "error": "Citation not found: '123 U.S. 456'",
        "citation": "123 U.S. 456",
        "endIndex": 31,
        "verified": false,
        "startIndex": 19,
        "normalizedCitation": "123 U.S. 456"
      },
      {
        "case": {
          "url": "https://www.courtlistener.com/opinion/469062/trustees-of-the-amalgamated-insurance-fund-v-mcfarlins-inc/",
          "name": "Trustees of the Amalgamated Insurance Fund v. McFarlin's, Inc.",
          "year": 1986,
          "court": "",
          "courtName": null,
          "dateFiled": "1986-04-10",
          "docketNumber": null,
          "citationCount": 217,
          "precedentialStatus": "Published"
        },
        "error": null,
        "citation": "789 F.2d 101",
        "endIndex": 167,
        "verified": true,
        "startIndex": 155,
        "normalizedCitation": "789 F.2d 101"
      }
    ],
    "total": 2,
    "source": {
      "url": "https://www.courtlistener.com",
      "license": "Public domain (court opinions) + CC0/BSD (metadata)",
      "provider": "CourtListener (Free Law Project)"
    }
  },
  "meta": {
    "cost": {
      "usd": 0.006,
      "tier": 0
    },
    "caller": "x402",
    "version": null,
    "endpoint": "law.case-verify",
    "settlement": {
      "txHash": "0xe3623bf4c28b1b590132c93c875996f998bc6915e1fbaac0e52f5ceeeff3eb76",
      "network": "eip155:8453",
      "success": true
    }
  }
}

Schema · Response

{
  "type": "json",
  "schema": {
    "type": "object",
    "required": [
      "ok",
      "items",
      "total",
      "source"
    ],
    "properties": {
      "ok": {
        "enum": [
          true
        ],
        "type": "boolean"
      },
      "meta": {
        "type": "object",
        "required": [
          "input",
          "verified",
          "unverified"
        ],
        "properties": {
          "input": {
            "type": "string",
            "description": "Echo of the checked text (truncated past 200 chars)."
          },
          "verified": {
            "type": "integer"
          },
          "unverified": {
            "type": "integer"
          }
        },
        "additionalProperties": false
      },
      "items": {
        "type": "array",
        "items": {
          "type": "object",
          "additionalProperties": {}
        }
      },
      "total": {
        "type": "integer",
        "nullable": true,
        "description": "Total matching rows upstream; null when unknown."
      },
      "source": {
        "type": "object",
        "required": [
          "provider",
          "url",
          "license"
        ],
        "properties": {
          "url": {
            "type": "string"
          },
          "license": {
            "type": "string"
          },
          "provider": {
            "type": "string"
          }
        },
        "additionalProperties": false
      }
    },
    "additionalProperties": false
  },
  "example": {
    "ok": true,
    "meta": {
      "input": "example",
      "verified": 1,
      "unverified": 1
    },
    "items": [
      {}
    ],
    "total": 1,
    "source": {
      "url": "example",
      "license": "example",
      "provider": "example"
    }
  }
}

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How this service works

Output

Technical details

Endpoint

POSThttps://2s.io/api/law/case-verify

When to prefer

Side effects

Text too short (minLength:1 not met) — validation error
Text exceeds 30,000 character limit — request rejected
No recognizable case citations found in text — empty items array returned
Upstream case database unavailable — possible 5xx or degraded response
Payment not included or insufficient — 402 Payment Required

Input

{
  "text": "In Smith v. Jones, 123 U.S. 456 (1999), the court held that statutory interpretation requires careful analysis of legislative intent. See also Doe v. Roe, 789 F.2d 101 (5th Cir. 2003), which clarified the standard for summary judgment motions."
}

Schema · Request body

Field	Type	Description
text	string

Output

{
  "data": {
    "ok": true,
    "meta": {
      "input": "In Smith v. Jones, 123 U.S. 456 (1999), the court held that statutory interpretation requires careful analysis of legislative intent. See also Doe v. Roe, 789 F.2d 101 (5th Cir. 2003), which clarified…",
      "verified": 1,
      "unverified": 1
    },
    "items": [
      {
        "case": null,
        "error": "Citation not found: '123 U.S. 456'",
        "citation": "123 U.S. 456",
        "endIndex": 31,
        "verified": false,
        "startIndex": 19,
        "normalizedCitation": "123 U.S. 456"
      },
      {
        "case": {
          "url": "https://www.courtlistener.com/opinion/469062/trustees-of-the-amalgamated-insurance-fund-v-mcfarlins-inc/",
          "name": "Trustees of the Amalgamated Insurance Fund v. McFarlin's, Inc.",
          "year": 1986,
          "court": "",
          "courtName": null,
          "dateFiled": "1986-04-10",
          "docketNumber": null,
          "citationCount": 217,
          "precedentialStatus": "Published"
        },
        "error": null,
        "citation": "789 F.2d 101",
        "endIndex": 167,
        "verified": true,
        "startIndex": 155,
        "normalizedCitation": "789 F.2d 101"
      }
    ],
    "total": 2,
    "source": {
      "url": "https://www.courtlistener.com",
      "license": "Public domain (court opinions) + CC0/BSD (metadata)",
      "provider": "CourtListener (Free Law Project)"
    }
  },
  "meta": {
    "cost": {
      "usd": 0.006,
      "tier": 0
    },
    "caller": "x402",
    "version": null,
    "endpoint": "law.case-verify",
    "settlement": {
      "txHash": "0xe3623bf4c28b1b590132c93c875996f998bc6915e1fbaac0e52f5ceeeff3eb76",
      "network": "eip155:8453",
      "success": true
    }
  }
}

Schema · Response

{
  "type": "json",
  "schema": {
    "type": "object",
    "required": [
      "ok",
      "items",
      "total",
      "source"
    ],
    "properties": {
      "ok": {
        "enum": [
          true
        ],
        "type": "boolean"
      },
      "meta": {
        "type": "object",
        "required": [
          "input",
          "verified",
          "unverified"
        ],
        "properties": {
          "input": {
            "type": "string",
            "description": "Echo of the checked text (truncated past 200 chars)."
          },
          "verified": {
            "type": "integer"
          },
          "unverified": {
            "type": "integer"
          }
        },
        "additionalProperties": false
      },
      "items": {
        "type": "array",
        "items": {
          "type": "object",
          "additionalProperties": {}
        }
      },
      "total": {
        "type": "integer",
        "nullable": true,
        "description": "Total matching rows upstream; null when unknown."
      },
      "source": {
        "type": "object",
        "required": [
          "provider",
          "url",
          "license"
        ],
        "properties": {
          "url": {
            "type": "string"
          },
          "license": {
            "type": "string"
          },
          "provider": {
            "type": "string"
          }
        },
        "additionalProperties": false
      }
    },
    "additionalProperties": false
  },
  "example": {
    "ok": true,
    "meta": {
      "input": "example",
      "verified": 1,
      "unverified": 1
    },
    "items": [
      {}
    ],
    "total": 1,
    "source": {
      "url": "example",
      "license": "example",
      "provider": "example"
    }
  }
}