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mirrored listing x402 eip155:8453

Convert a value between units in the same physical dimension: length, mass, volume, temper

Convert a value between units in the same physical dimension: length, mass, volume, temperature, area, speed, data, energy, pressure, time, angle. Factors are exact SI constants (NIST SP 811) — deterministic, unlike an LLM's guess. Pass ?category=currency to convert ISO 4217 amounts at ECB reference rates instead (informational, not for pricing). Unknown units → 400 with a suggestion.

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1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-08-24
updated

Provider

402utils.com · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "from": "celsius",
          "to": "fahrenheit",
          "value": 100
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "category": "temperature",
          "from": "celsius",
          "result": 212,
          "to": "fahrenheit",
          "value": 100
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "description": "The value plus source and target units. Query ?category=currency switches to FX.",
              "properties": {
                "from": {
                  "description": "Source unit (e.g. mile, kg, celsius) or ISO 4217 code for currency.",
                  "type": "string"
                },
                "to": {
                  "description": "Target unit (same dimension as `from`).",
                  "type": "string"
                },
                "value": {
                  "description": "The amount to convert.",
                  "type": "number"
                }
              },
              "required": [
                "value",
                "from",
                "to"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "category": {
                  "description": "The detected dimension (or \"currency\").",
                  "type": "string"
                },
                "date": {
                  "description": "Present for currency: the effective ECB business day.",
                  "type": "string"
                },
                "from": {
                  "type": "string"
                },
                "rate": {
                  "description": "Present for currency: units of `to` per unit of `from`.",
                  "type": "number"
                },
                "result": {
                  "description": "The converted value.",
                  "type": "number"
                },
                "source": {
                  "description": "Present for currency: \"ECB\".",
                  "type": "string"
                },
                "to": {
                  "type": "string"
                },
                "value": {
                  "type": "number"
                }
              },
              "required": [
                "value",
                "from",
                "to",
                "category",
                "result"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://402utils.com/v1/unit-convert"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://402utils.com/v1/unit-convert");
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://402utils.com/v1/unit-convert")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/5909.json, and this resource appears in /discovery/resources and /discovery/search.