Agent Service · x402 · early usage

File type and MIME/media type inspector — identify bounded content by magic bytes and r…

File type and MIME/media type inspector — identify bounded content by magic bytes and return SHA-256, size, and extension consistency without unpacking, malware scanning, or safety claims.

by artifact-inspector.use.x402atlas.com · discovered, not yet claimed by its owner · updated 2026-10-06

30d calls3

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

File type and MIME/media type inspector — identify bounded content by magic bytes and return SHA-256, size, and extension consistency without unpacking, malware scanning, or safety claims.

Tags: file-type · media-type · mime-type · content-sniff · sha256 · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-06

Input example from Bazaar metadata

{
  "content_base64": "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=",
  "filename": "pixel.png"
}

Output example

{
  "algorithm_version": "go-content-sniff-v1",
  "operation": "file-inspect",
  "result": {
    "extension": ".png",
    "extension_matches": true,
    "extension_media_type": "image/png",
    "filename_provided": true,
    "media_type": "image/png",
    "sha256": "431ced6916a2a21a156e38701afe55bbd7f88969fbbfc56d7fe099d47f265460",
    "size": 68,
    "warnings": []
  },
  "warnings": [
    "Media-type sniffing and extension consistency are not malware, macro, archive-content, execution-safety, or general file-safety results."
  ]
}

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/28642.json for the price and payment options.
Pay. Call GET https://artifact-inspector.use.x402atlas.com/file. 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, Polygon, Arbitrum One, 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: $0.005 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, Solana
Demand: 3 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005	0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2	300s
exact	Polygon eip155:137	USDC	$0.005	0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2	300s
exact	Arbitrum One eip155:42161	USDC	$0.005	0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.005	ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "additionalProperties": false,
      "properties": {
        "_atlas": {
          "additionalProperties": false,
          "description": "Atlas documentation and related-route metadata added after deployment",
          "properties": {
            "docs": {
              "description": "Documentation URL for this bridge",
              "format": "uri",
              "maxLength": 512,
              "type": "string"
            },
            "related": {
              "description": "Bounded related Atlas routes",
              "items": {
                "additionalProperties": false,
                "description": "One related Atlas route",
                "properties": {
                  "bridge": {
                    "description": "Related bridge name",
                    "maxLength": 64,
                    "type": "string"
                  },
                  "docs": {
                    "description": "Related bridge documentation URL",
                    "format": "uri",
                    "maxLength": 512,
                    "type": "string"
                  },
                  "summary": {
                    "description": "Short capability summary",
                    "maxLength": 256,
                    "type": "string"
                  },
                  "url": {
                    "description": "Related route URL",
                    "format": "uri",
                    "maxLength": 512,
                    "type": "string"
                  }
                },
                "required": [
                  "bridge",
                  "url",
                  "docs",
                  "summary"
                ],
                "type": "object"
              },
              "maxItems": 3,
              "type": "array"
            }
          },
          "required": [
            "docs"
          ],
          "type": "object"
        },
        "algorithm_version": {
          "const": "go-content-sniff-v1",
          "description": "Pinned bounded Go content-sniffing contract",
          "type": "string"
        },
        "operation": {
          "const": "file-inspect",
          "description": "Stable operation name",
          "type": "string"
        },
        "result": {
          "additionalProperties": false,
          "description": "Bounded content-sniffing and integrity result",
          "properties": {
            "extension": {
              "description": "Lowercase filename extension or empty",
              "type": "string"
            },
            "extension_matches": {
              "description": "Comparison result or null when no registered extension was available",
              "type": [
                "boolean",
                "null"
              ]
            },
            "extension_media_type": {
              "description": "Registered media type for the extension or empty",
              "type": "string"
            },
            "filename_provided": {
              "description": "Whether a synthetic filename was supplied",
              "type": "boolean"
            },
            "media_type": {
              "description": "Bounded magic-sniffed media type; application/octet-stream means unknown",
              "type": "string"
            },
            "sha256": {
              "description": "SHA-256 of the decoded bytes",
              "pattern": "^[0-9a-f]{64}$",
              "type": "string"
            },
            "size": {
              "description": "Decoded byte length",
              "maximum": 1048576,
              "minimum": 0,
              "type": "integer"
            },
            "warnings": {
              "description": "Extension consistency warnings",
              "items": {
                "description": "Human-readable warning",
                "type": "string"
              },
              "maxItems": 4,
              "type": "array"
            }
          },
          "required": [
            "size",
            "sha256",
            "media_type",
            "filename_provided",
            "extension",
            "extension_media_type",
            "extension_matches",
            "warnings"
          ],
          "type": "object"
        },
        "warnings": {
          "description": "Route-level safety limitations",
          "items": {
            "description": "Human-readable warning",
            "type": "string"
          },
          "maxItems": 4,
          "type": "array"
        }
      },
      "required": [
        "operation",
        "algorithm_version",
        "result",
        "warnings"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "_atlas": {
      "docs": "https://example.com",
      "related": [
        {
          "bridge": "string",
          "docs": "https://example.com",
          "summary": "string",
          "url": "https://example.com"
        }
      ]
    },
    "algorithm_version": "string",
    "operation": "string",
    "result": {
      "extension": "string",
      "extension_matches": true,
      "extension_media_type": "string",
      "filename_provided": true,
      "media_type": "string",
      "sha256": "string",
      "size": 0,
      "warnings": [
        "string"
      ]
    },
    "warnings": [
      "string"
    ]
  },
  "type": "string"
}

Examples

curl

curl -X POST 'https://artifact-inspector.use.x402atlas.com/file' -H 'Content-Type: application/json' --data '{"content_base64":"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=","filename":"pixel.png"}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://artifact-inspector.use.x402atlas.com/file", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"content_base64\":\"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=\",\"filename\":\"pixel.png\"}"
});
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
import json
res = httpx.request("POST", "https://artifact-inspector.use.x402atlas.com/file", json=json.loads("{\"content_base64\":\"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=\",\"filename\":\"pixel.png\"}"))
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: artifact-inspector.use.x402atlas.com
Endpoint: https://artifact-inspector.use.x402atlas.com/file
Machine-readable: /resources/28642.json