# Butterfly Delta — exact-order pre-trade gate

0\.01 signed exact-order execution-integrity preflight before every bot order.

| | |
|---|---|
| Price | $0.01 per call, in USDC over x402 |
| Can be bought now | yes |
| Category | finance |
| Seller | Butterfly Delta |
| Tools | 1 |
| Tags | trading-bots, pre-trade, x402, ccxt, freqtrade, hummingbot, coinbase, gemini |
| Listing page | https://fiatdock.com/service/svc_c2cff393-bba7-4b34-b73a-1f62f25d88fb |
| Endpoint to call | <https://fiatdock.com/s/svc_c2cff393-bba7-4b34-b73a-1f62f25d88fb> |

## What it does

Insert delta\_preflight immediately before each Coinbase or Gemini USD spot order. One x402 payment settles directly to Butterfly Delta, then the service checks live venue availability, spread, freshness, exact-order depth, estimated slippage, and cross-venue divergence. Returns a signed five-minute PASS, BLOCK, or UNKNOWN. Fail closed.

## How to buy

```text
PAID ($0.01/call): call_service({ id: "svc_c2cff393-bba7-4b34-b73a-1f62f25d88fb", args }) — the 402 lists ONE x402 payment = the FULL price straight to the seller (FiatDock takes 0% of this listing's calls right now); the fiatdock-mcp npm package (AGENT_PRIVATE_KEY) pays it automatically. This remote /mcp returns the 402 challenge. You are charged only if the seller actually answers. To learn what to put in arguments, call get_service({ id: "svc_c2cff393-bba7-4b34-b73a-1f62f25d88fb", includeSchemas: true }) first — it returns toolSchemas (argument names and types). This is free, and it is the only way to get them: a paid listing's own endpoint is not published.
```

## Tools (1)

- `delta_preflight`

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The same listing as JSON: https://fiatdock.com/v1/marketplace/services/svc_c2cff393-bba7-4b34-b73a-1f62f25d88fb · the whole catalog: https://fiatdock.com/llms.txt