Market Data · x402 · early usage

Validate CSV before import using a fixed JSON column specification

by csv-validator.mekler.ai · discovered, not yet claimed by its owner · updated 2026-10-02

30d calls2

30d payers2

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Validate CSV before import using a fixed JSON column specification. Checks missing/extra columns, required cells, string/integer/decimal/boolean/date types, uniqueness, allowed values and numeric/row-count bounds. Returns pass/fail with row/column error codes. POST JSON with csv and spec.columns; schemas/examples attached. Full contract: /openapi.json. Max 2,000 rows, 50 columns, 256 KiB; first 50 failures. No formulas, cross-column rules, fact checking or data repair.

Tags: csv · data-validation · data-quality · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-02

Input example from Bazaar metadata

{
  "csv": "id,amount\na,12.50\na,-2.00\n",
  "spec": {
    "columns": [
      {
        "name": "id",
        "required": true,
        "type": "string",
        "unique": true
      },
      {
        "max": "100",
        "min": "0",
        "name": "amount",
        "required": true,
        "type": "decimal"
      }
    ],
    "min_rows": 1
  }
}

Output example

{
  "boundary": "Only supplied explicit criteria checked; no certification of truth or subjective quality.",
  "failure_count": 2,
  "failures": [
    {
      "code": "unique",
      "column": "id",
      "row": 2
    },
    {
      "code": "min",
      "column": "amount",
      "row": 2
    }
  ],
  "failures_truncated": false,
  "receipt_sha256": "32265ae46050fa0067b9adb0df085a5cf3d9fa3d47d91e9ea2f61135a382d8ac",
  "rows_checked": 2,
  "schema_version": 1,
  "verdict": "fail"
}

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/38114.json for the price and payment options.
Pay. Call GET https://csv-validator.mekler.ai/v1/accept/csv. 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 Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.05 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Solana
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.05	9mMDrHabSf73MPn1ANdANSmsNw2wKiqE7JZ7eD6EUSRc	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "9mMDrHabSf73MPn1ANdANSmsNw2wKiqE7JZ7eD6EUSRc",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "boundary": {
          "type": "string"
        },
        "failure_count": {
          "minimum": 0,
          "type": "integer"
        },
        "failures": {
          "items": {
            "properties": {
              "code": {
                "enum": [
                  "missing_column",
                  "extra_columns",
                  "row_width",
                  "required",
                  "type",
                  "min",
                  "max",
                  "enum",
                  "unique",
                  "min_rows",
                  "max_rows"
                ],
                "type": "string"
              },
              "column": {
                "description": "Column name, or null when the error applies to the row or file.",
                "type": [
                  "string",
                  "null"
                ]
              },
              "row": {
                "description": "One-based data record, excluding header; null for file/header errors.",
                "type": [
                  "integer",
                  "null"
                ]
              }
            },
            "required": [
              "code",
              "row",
              "column"
            ],
            "type": "object"
          },
          "maxItems": 50,
          "type": "array"
        },
        "failures_truncated": {
          "type": "boolean"
        },
        "receipt_sha256": {
          "pattern": "^[0-9a-f]{64}$",
          "type": "string"
        },
        "rows_checked": {
          "minimum": 0,
          "type": "integer"
        },
        "schema_version": {
          "enum": [
            1
          ],
          "type": "integer"
        },
        "verdict": {
          "enum": [
            "pass",
            "fail"
          ],
          "type": "string"
        }
      },
      "required": [
        "schema_version",
        "verdict",
        "rows_checked",
        "failure_count",
        "failures",
        "failures_truncated",
        "receipt_sha256",
        "boundary"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "boundary": "string",
    "failure_count": 0,
    "failures": [
      {
        "code": "missing_column",
        "column": "string",
        "row": 0
      }
    ],
    "failures_truncated": true,
    "receipt_sha256": "string",
    "rows_checked": 0,
    "schema_version": 1,
    "verdict": "pass"
  },
  "type": "string"
}

Examples

curl

curl "https://csv-validator.mekler.ai/v1/accept/csv"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://csv-validator.mekler.ai/v1/accept/csv");
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://csv-validator.mekler.ai/v1/accept/csv")
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: csv-validator.mekler.ai
Endpoint: https://csv-validator.mekler.ai/v1/accept/csv
Machine-readable: /resources/38114.json