Extract file extension from a path or URL path segment — first-party local utility for age

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "28heAMpFkeUJsL7o7apiK4oJwZWq2fUHinRwbgYYsemG",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "category": "web-api-intelligence",
    "info": {
      "input": {
        "body": {
          "path": "https://cdn.example.com/a/b.PNG?x=1"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "basename": "b.PNG",
          "extension": "png",
          "has_extension": true,
          "schema": "delx/util-path-ext/v1"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": true,
              "properties": {
                "path": {
                  "description": "Input field: path.",
                  "type": "string"
                }
              },
              "required": [
                "path"
              ],
              "type": "object"
            },
            "bodyType": {
              "const": "json",
              "type": "string"
            },
            "method": {
              "const": "POST",
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": true,
              "description": "Bounded first-party JSON result; input is processed in memory and not retained.",
              "properties": {
                "basename": {
                  "type": "string"
                },
                "extension": {
                  "type": "string"
                },
                "has_extension": {
                  "type": "boolean"
                },
                "schema": {
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "json",
              "type": "string"
            }
          },
          "required": [
            "type",
            "example"
          ],
          "type": "object"
        }
      },
      "required": [
        "input",
        "output"
      ],
      "type": "object"
    },
    "serviceName": "Delx Path Ext",
    "summary": "Extract file extension from a path or URL path segment — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls.",
    "tags": [
      "x402",
      "agents",
      "local-first",
      "micro-usdc",
      "web-api-intelligence",
      "path",
      "ext"
    ]
  }
}

curl "https://api.delx.ai/api/v1/x402/path-ext"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.delx.ai/api/v1/x402/path-ext");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://api.delx.ai/api/v1/x402/path-ext")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header