API · x402

Infer CSV column names and sample data types before loading a table or importing data

Infer CSV column names and sample data types before loading a table or importing data. Returns missing-value and distinct-value counts, possible unique keys, malformed-row issues, and a draft JSON Schema 2020-12 without returning cell values or making a model…

by Agent Evidence Utility · verified provider · updated 2026-11-15

What it does

Tags: csv · csv-schema · schema-inference · column-types · data-profiling · json-schema · etl · missing-values · unique-keys

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/79813.json for the price and payment options.
Pay. Call GET https://agent-evidence-extractor.defcronyke.workers.dev/v1/csv-profile. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Arbitrum One, Polygon, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.005 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Arbitrum One, Polygon

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005	0xc4e484e62133dadac5be498ae3f311f5b8428cce	300s
exact	Arbitrum One eip155:42161	USDC	$0.005	0xc4e484e62133dadac5be498ae3f311f5b8428cce	300s
exact	Polygon eip155:137	USDC	$0.005	0xc4e484e62133dadac5be498ae3f311f5b8428cce	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc4e484e62133dadac5be498ae3f311f5b8428cce",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xc4e484e62133dadac5be498ae3f311f5b8428cce",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xc4e484e62133dadac5be498ae3f311f5b8428cce",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "type": "object",
  "required": [
    "summary",
    "columns",
    "issues",
    "suggested_json_schema",
    "note"
  ],
  "properties": {
    "summary": {
      "type": "object",
      "required": [
        "records",
        "columns",
        "blank_records",
        "width_mismatch_records"
      ],
      "properties": {
        "records": {
          "type": "integer"
        },
        "columns": {
          "type": "integer"
        },
        "blank_records": {
          "type": "integer"
        },
        "width_mismatch_records": {
          "type": "integer"
        }
      }
    },
    "columns": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "name",
          "inferred_type",
          "non_empty_values",
          "empty_values",
          "distinct_values",
          "unique_candidate",
          "ambiguous"
        ],
        "properties": {
          "name": {
            "type": "string"
          },
          "inferred_type": {
            "type": "string",
            "enum": [
              "string",
              "integer",
              "number",
              "boolean",
              "date",
              "email"
            ]
          },
          "non_empty_values": {
            "type": "integer"
          },
          "empty_values": {
            "type": "integer"
          },
          "distinct_values": {
            "type": "integer"
          },
          "unique_candidate": {
            "type": "boolean"
          },
          "ambiguous": {
            "type": "boolean"
          }
        }
      }
    },
    "issues": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "record",
          "code"
        ],
        "properties": {
          "record": {
            "type": "integer"
          },
          "code": {
            "type": "string",
            "enum": [
              "blank_record",
              "record_width_mismatch"
            ]
          }
        }
      }
    },
    "suggested_json_schema": {
      "type": "object",
      "description": "Draft JSON Schema 2020-12 inferred from sample values; review before production use.",
      "required": [
        "$schema",
        "title",
        "type",
        "properties",
        "required",
        "additionalProperties"
      ],
      "properties": {
        "$schema": {
          "type": "string"
        },
        "title": {
          "type": "string"
        },
        "type": {
          "const": "object"
        },
        "properties": {
          "type": "object",
          "additionalProperties": true
        },
        "required": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "additionalProperties": {
          "const": false
        }
      }
    },
    "note": {
      "type": "string"
    }
  }
}

Example shape — generated from the schema, not a captured live response

{
  "summary": {
    "records": 0,
    "columns": 0,
    "blank_records": 0,
    "width_mismatch_records": 0
  },
  "columns": [
    {
      "name": "string",
      "inferred_type": "string",
      "non_empty_values": 0,
      "empty_values": 0,
      "distinct_values": 0,
      "unique_candidate": true,
      "ambiguous": true
    }
  ],
  "issues": [
    {
      "record": 0,
      "code": "blank_record"
    }
  ],
  "suggested_json_schema": {
    "$schema": "string",
    "title": "string",
    "type": null,
    "properties": {},
    "required": [
      "string"
    ],
    "additionalProperties": null
  },
  "note": "string"
}

Examples

curl

curl "https://agent-evidence-extractor.defcronyke.workers.dev/v1/csv-profile"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://agent-evidence-extractor.defcronyke.workers.dev/v1/csv-profile");
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://agent-evidence-extractor.defcronyke.workers.dev/v1/csv-profile")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: Agent Evidence Utility
Endpoint: https://agent-evidence-extractor.defcronyke.workers.dev/v1/csv-profile
Machine-readable: /resources/79813.json