# FiatDock Marketplace – Whale Swaps on Base

> FiatDock Marketplace – Whale Swaps on Base is a paid API for AI agents from fiatdock.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Returns large on-chain swap transactions (whale trades) on Base network, filterable by DEX, size, direction, and recency

## Facts

- Endpoint: GET https://fiatdock.com/s/svc_65609f66-a093-445d-ada7-9d13fed22953?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-marketplace-whale-swaps-on-base-f2658435
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ncf3VzdqACw7gcB_dlKFg

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 fiatdock-marketplace-whale-swaps-on-base-f2658435
```

Example prompt: Show me the 10 largest swap transactions on Base from the last 24 hours — only buys, with a minimum size of $50,000, across any DEX.

## When to prefer this

Choose this endpoint when you need real-time or near-real-time data on large on-chain swap activity specifically on the Base network, especially if you want to filter by DEX, direction, or minimum trade size. Prefer this over general crypto price feeds when the goal is to detect whale market movements or smart money flows rather than token prices.

## Known failure modes

- No results returned if no whale swaps occurred in the specified time window
- Invalid DEX name may return empty results or an error
- Negative or zero 'min' value may cause unexpected behavior
- 'since' timestamp too far in the past may exceed data retention limits
- Rate limiting or payment failure if the x402 payment is not properly handled

## How this service works

Pay-per-call: true402 Whale Swaps on Base

## Output

A list of large swap transactions on Base, each including the DEX, trade direction (buy/sell), swap size, token pair, and block timestamp, filtered according to the provided query parameters.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "dex": {
       "type": "string"
      },
      "min": {
       "type": "number"
      },
      "limit": {
       "type": "number"
      },
      "since": {
       "type": "number"
      },
      "direction": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiatdock-marketplace-whale-swaps-on-base-f2658435/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fiatdock.com](https://www.zero.xyz/host/fiatdock.com/llms.txt)