# Saylor Innovations Crypto Order Book Depth & Slippage

> Saylor Innovations Crypto Order Book Depth & Slippage is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Returns slippage cost, spread, average fill price, and best venue to buy or sell a crypto asset for a given USD trade size across Coinbase, Kraken, Bitstamp, and Gemini order books.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/crypto/orderbook/depth?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-crypto-order-book-depth-slippage-71889117
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OxK8QVoNjGTSN9LU9pVs5

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 saylor-innovations-crypto-order-book-depth-slippage-71889117
```

Example prompt: What would it cost in slippage to buy $250,000 worth of ETH right now, and which of Coinbase, Kraken, Bitstamp, or Gemini gives the best fill price?

## When to prefer this

Choose this endpoint when you need real-time, multi-exchange order book slippage and execution cost analysis for a specific USD trade size. It is ideal for pre-trade routing decisions, comparing execution quality across Coinbase, Kraken, Bitstamp, and Gemini simultaneously, or any workflow where minimizing market impact of a large crypto trade matters. Prefer it over single-exchange ticker APIs when cross-venue comparison and slippage quantification are the goal.

## Known failure modes

- Exchange API unavailable — that venue is excluded from results and venues_responding count drops
- Invalid coin symbol — endpoint may return empty venues or an error
- Trade size outside 100–10,000,000 USD range — may return an error or unexpected result
- Insufficient order book depth for requested trade size — slippage figures may be null or incomplete
- Network timeout fetching live order book data — checked_at may reflect stale or partial data

## How this service works

Crypto slippage - what a USD trade size costs on the Coinbase, Kraken, Bitstamp and Gemini order books, with spread, average fill price, slippage percent and best venue to buy or sell

## Output

A JSON object containing, for each responding exchange, the best bid, best ask, spread percent, number of order book levels fetched, and buy/sell sub-objects with average fill price and slippage percent. Also includes top-level fields for the best venue to buy, best venue to sell, total venues responding, trade size in USD, the coin symbol, and a timestamp of when the check was run.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "base"
     ],
     "properties": {
      "usd": {
       "type": "string",
       "description": "optional trade size in USD, 100-10000000, default 100000"
      },
      "base": {
       "type": "string",
       "description": "Coin symbol, e.g. BTC, ETH, SOL"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "base",
      "venues"
     ],
     "properties": {
      "base": {
       "type": "string",
       "description": "Base asset or base currency"
      },
      "note": {
       "type": [
        "string",
        "null"
       ],
       "description": "Caveat or context for reading the result"
      },
      "venues": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "buy": {
          "type": "object"
         },
         "sell": {
          "type": "object"
         },
         "best_ask": {
          "description": "Lowest ask price"
         },
         "best_bid": {
          "description": "Highest bid price"
         },
         "exchange": {
          "type": "string",
          "description": "Exchange the data comes from"
         },
         "spread_pct": {
          "type": [
           "number",
           "null"
          ],
          "description": "Spread, as a percentage"
         },
         "levels_fetched": {
          "description": "Levels fetched"
         }
        }
       },
       "description": "Venues included"
      },
      "checked_at": {
       "type": [
        "string",
        "null"
       ],
       "description": "Time the check was run (UTC)"
      },
      "trade_size_usd": {
       "type": "number",
       "description": "Trade size, in US dollars"
      },
      "best_venue_to_buy": {
       "type": [
        "string",
    
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-crypto-order-book-depth-slippage-71889117/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)