# santyvv-data Order Execution Check

> santyvv-data Order Execution Check is a paid API for AI agents from x402.santyvv.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-12).

Walks a live order book level-by-level to return an ok/ajustado/riesgo verdict with effective price, slippage in bps and USD, book depth consumed, and maximum safe order size before submitting a trade.

## Facts

- Endpoint: GET https://x402.santyvv.com/api/execution/check?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/santyvv-data-order-execution-check-acf2cb03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3fZ-fXEazpq6QDw8FeFtz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability santyvv-data-order-execution-check-acf2cb03
```

Example prompt: Before I place my order, check if selling $25,000 worth of BTCUSDT on MEXC is safe — I want to know the effective price, slippage in bps, and the maximum size I can sell without blowing past 25 bps slippage.

## When to prefer this

Use this endpoint when you need a real-time, per-order pre-trade analysis without downloading the full order book yourself. It is ideal for sizing orders to fit within a slippage budget, validating a fill before quoting it to a counterparty, or comparing execution cost across venues. Prefer it over generic market data feeds when you need a concrete verdict (ok/ajustado/riesgo) with actionable reasons rather than raw book data.

## Known failure modes

- Order size exceeds visible book depth — slippage will be underestimated and an aviso is returned
- Invalid or unsupported trading pair returns an error
- Payment not attached or insufficient USDC — HTTP 402 response
- Order book data unavailable for the requested venue — endpoint may return an error or stale data
- Malformed query parameters result in a 400-level error

## How this service works

Market and on-chain data, paid per call in USDC on Base through the x402 protocol. No accounts, no API keys. Sources are public data providers; the value added here is keyless access, edge caching, multi-source fallback and normalised responses.

## Output

Returns a JSON object with a verdict field (ok / ajustado / riesgo), the effective execution price, slippage in basis points and USD, percentage of the visible book the order consumes, number of order book levels consumed, best bid/ask, spread in bps, mid price, and the maximum order size (in base and quote USD) that still fits within the declared slippage target — along with explanatory motivos and avisos arrays.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "par": "BTCUSDT",
  "lado": "venta",
  "libro": {
   "fuente": "mexc",
   "mejor_ask": 118438.9,
   "mejor_bid": 118432.1,
   "spread_bps": 0.57,
   "precio_medio": 118435.5,
   "niveles_visibles": 100
  },
  "orden": {
   "base": 0.2113,
   "completa": true,
   "quote_usd": 25000,
   "solicitada": {
    "quote_usd": 25000
   },
   "slippage_bps": 11.24,
   "precio_efectivo": 118302.4,
   "costo_vs_medio_usd": 28.1,
   "niveles_consumidos": 6,
   "porcentaje_del_libro": 1.36,
   "profundidad_libro_usd": 1843200.55
  },
  "avisos": [
   "Calculado sobre los 100 niveles publicos de mexc; una orden mayor que la profundidad visible queda subestimada.",
   "El tamano maximo se corta en el primer nivel que rompe el objetivo de slippage (no reparte el nivel frontera)."
  ],
  "motivos": [
   "Ejecutable dentro del objetivo declarado."
  ],
  "veredicto": "ok",
  "tamano_maximo": {
   "base": 1.0842,
   "quote_usd": 128400.9,
   "cortado_por_precio": true,
   "slippage_objetivo_bps": 25
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/santyvv-data-order-execution-check-acf2cb03/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.santyvv.com](https://www.zero.xyz/host/x402.santyvv.com/llms.txt)