Api Endpoint

x402-data-api.onrender.com

Exact math for agents — the arithmetic LLMs get plausibly wrong. Evaluates an expression at 50-significant-digit precision (BigNumber): big-integer multiplication, high-precision division, roots, logs, factorials, unit conversions (12 inch to cm). GET ?expr=…, result returned as an exact string. Deterministic, no AI, never executed as code.

Open interactive test console

Offering

Provider: x402-data-api.onrender.com
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Location And Travel
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://x402-data-api.onrender.com/api/calc
MIME type: application/json
First seen: 2026-10-16T02:54:53.696Z
Last seen: 2026-11-02T09:41:21.839Z
Tags: Math

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "payTo": "0xdd5fcEa81CA6f1EB39FEd5B973DE794293B81ba6"
  }
]

Observed health

Status: Healthy
Latest latency: 44 ms
Average latency: 470 ms
HTTP status: 402
Last checked: 2026-11-02T09:41:21.834Z
Reachability: 100% over 6 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "expr": {
          "type": "string",
          "description": "Math expression, max 400 chars — e.g. '2^128', 'sqrt(2)', '12 inch to cm'"
        }
      },
      "required": [
        "expr"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "expr": {
          "type": "string"
        },
        "result": {
          "type": "string",
          "description": "exact result as a string"
        },
        "result_number": {
          "type": "number",
          "description": "float64 companion when finite"
        },
        "type": {
          "type": "string"
        }
      }
    }
  },
  "required": [
    "type"
  ]
}