Base Onchain Data – ERC-20 Whale & Large Trade Tracker

x402

Base Onchain Data – ERC-20 Whale & Large Trade Tracker is a paid API for AI agents from ca-tax-api-mainnet.lxtap.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-23).

Returns all large buys and sells for an ERC-20 token on Base in the last N minutes, with USD size, side, wallet, net flow, and top whale wallets from the deepest WETH/USDC pools.

Price / call$0.02

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call data for AI agents, paid in USDC on Base with x402: token risk checks (rug check) on Base, Ethereum, Arbitrum, Optimism, Polygon and Solana, onchain reads (balances, transactions, gas, contracts, NFTs, whale trades, new pools, ENS and Basenames), ECB exchange rates, and Canadian sales tax and business days.

Output

Returns a list of individual large trades (up to the requested limit) with fields including side (buy/sell), USD size, wallet address, and transaction hash; aggregated buy volume, sell volume, and net flow; and ranked lists of wallets by buy and sell volume — all sourced from the token's deepest WETH/USDC pools on Uniswap v3 or Aerodrome on Base.

Example use cases

Whale accumulation alert for new token

“For the Base token at 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed, show me all trades over $5,000 in the last 60 minutes — I want to see if any whale wallets are quietly accumulating.”

Sell pressure check before an entry

“Before I buy this token, can you pull the buy and sell volume and net flow for 0x532f27101965dd16442E59d40670FaF5eBB142E7 on Base over the last 30 minutes, and flag any large sells above $3,000?”

Post-announcement trade spike analysis

“A big announcement just dropped for the token at 0x78a087d713Be963Bf307b18F2Ff8122EF9A63ae9 on Base — show me the top 20 trades from the last 15 minutes so I can see how whales reacted.”

Technical details

Endpoint

GEThttps://ca-tax-api-mainnet.lxtap.workers.dev/base/trades?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need real-time whale and large-trade intelligence for a specific ERC-20 on the Base network, especially when you want to see individual trade details (wallet, tx, USD size) alongside aggregated net flow from Uniswap v3 or Aerodrome pools. Prefer it over generic block explorers when you need pre-filtered, USD-denominated trade data with whale rankings ready for agent consumption. Use sibling endpoints for Arbitrum, Ethereum, or OP Mainnet instead if the token lives on a different chain.

Side effects

Invalid token address format (must be 0x + 40 hex chars) returns a validation error
Token has no qualifying liquidity pools on Base — returns empty trade list or error
minutes parameter out of range (below 5 or above 240) returns validation error
limit out of range (above 40) returns validation error
No trades meet the minUsd threshold in the window — returns empty list
RPC or indexer timeout on high-activity tokens may return partial data or 503

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "notes": "Trades from the 3 deepest WETH/USDC pools; other pairs and aggregator-internal routes are not counted. Wallets are transaction senders, looked up for the 40 largest trades.",
    "token": {
      "symbol": "DEGEN",
      "address": "0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed",
      "decimals": 18
    },
    "window": {
      "to": "2026-10-22T16:22:57.000Z",
      "from": "2026-10-22T15:22:57.000Z",
      "minutes": 60,
      "toBlock": 52948415,
      "fromBlock": 52946615
    },
    "summary": {
      "buys": 20,
      "sells": 1,
      "trades": 21,
      "netFlowUsd": 1223.35,
      "buyVolumeUsd": 1223.4,
      "sellVolumeUsd": 0.0558468,
      "largestTradeUsd": 142.466
    },
    "nativeUsd": 2396.4,
    "topBuyers": [
      {
        "netUsd": 471.2,
        "trades": 9,
        "wallet": "0x3dA47e29a82651171c57956A73F80b3905B8b230",
        "soldUsd": 0,
        "boughtUsd": 471.2
      },
      {
        "netUsd": 262.4,
        "trades": 2,
        "wallet": "0x2342110f3Af09c848C104fdE3E7261Dc0C5C4d7a",
        "soldUsd": 0,
        "boughtUsd": 262.4
      },
      {
        "netUsd": 239.6,
        "trades": 2,
        "wallet": "0x9CA5CAcb8CD8820415f7cA3C3C3cf7E23c885bd7",
        "soldUsd": 0,
        "boughtUsd": 239.6
      },
      {
        "netUsd": 142.3,
        "trades": 1,
        "wallet": "0x2c2e035D20Cd6da1664a7Cf0EAf98e3647607304",
        "soldUsd": 0,
        "boughtUsd": 142.3
      },
      {
        "netUsd": 67.59,
        "trades": 1,
        "wallet": "0x911E228d9105963b68af40880Ce8Dd6d5Ee8637E",
        "soldUsd": 0,
        "boughtUsd": 67.59
      }
    ],
    "topSellers": [
      {
        "netUsd": -0.05585,
        "trades": 1,
        "wallet": "0xbdBeBD58cC8153Ce74530BB342427579315915B2",
        "soldUsd": 0.05585,
        "boughtUsd": 0
      }
    ],
    "largeTrades": [
      {
        "tx": "0x2079d9a6e334ecfb885c7f0144002d59e1c9030f4e34cf9f4a54968d91f11e4f",
        "dex": "uniswap-v3",
        "usd": 142.466,
        "side": "buy",
        "block": 52946817,
        "wallet": "0x2342110f3Af09c848C104fdE3E7261Dc0C5C4d7a",
        "approxTime": "2026-10-22T15:29:41.000Z",
        "quoteAmount": 0.05945,
        "quoteSymbol": "WETH",
        "tokenAmount": 149873.49
      },
      {
        "tx": "0x63e5e82b77986e25689e4e68c61044c15c8f5431038b1bfdaf72aa499401464b",
        "dex": "uniswap-v3",
        "usd": 142.322,
        "side": "buy",
        "block": 52947027,
        "wallet": "0x2c2e035D20Cd6da1664a7Cf0EAf98e3647607304",
        "approxTime": "2026-10-22T15:36:41.000Z",
        "quoteAmount": 0.05939,
        "quoteSymbol": "WETH",
        "tokenAmount": 149535.86
      },
      {
        "tx": "0x8b75da4612b49b617aa6f50ab419bbd80586557811e194b4ef74cc72a82c31da",
        "dex": "uniswap-v3",
        "usd": 119.964,
        "side": "buy",
        "block": 52946821,
        "wallet": "0x2342110f3Af09c848C104fdE3E7261Dc0C5C4d7a",
        "approxTime": "2026-10-22T15:29:49.000Z",
        "quoteAmount": 0.05006,
        "quoteSymbol": "WETH",
        "tokenAmount": 126158.12
      },
      {
        "tx": "0xdb03281dd3142dd5d095abc85539f60e32d9d424b56b601aca376ecd6563aeb5",
        "dex": "uniswap-v3",
        "usd": 119.82,
        "side": "buy",
        "block": 52947027,
        "wallet": "0x9CA5CAcb8CD8820415f7cA3C3C3cf7E23c885bd7",
        "approxTime": "2026-10-22T15:36:41.000Z",
        "quoteAmount": 0.05,
        "quoteSymbol": "WETH",
        "tokenAmount": 125923.21
      },
      {
        "tx": "0x54f59ce65722caa69d4d2c76254739354b3bbe109bb22fca6833370fff839065",
        "dex": "uniswap-v3",
        "usd": 119.82,
        "side": "buy",
        "block": 52947027,
        "wallet": "0x9CA5CAcb8CD8820415f7cA3C3C3cf7E23c885bd7",
        "approxTime": "2026-10-22T15:36:41.000Z",
        "quoteAmount": 0.05,
        "quoteSymbol": "WETH",
        "tokenAmount": 125863.06
      }
    ],
    "poolsScanned": [
      {
        "dex": "uniswap-v3",
        "pool": "0xc9034c3E7F58003E6ae0C8438e7c8f4598d5ACAA",
        "pairedWith": "WETH"
      },
      {
        "dex": "uniswap-v3",
        "pool": "0x0cA6485b7e9cF814A3Fd09d81672B07323535b64",
        "pairedWith": "WETH"
      },
      {
        "dex": "aerodrome",
        "pool": "0x2C4909355b0C036840819484c3A882A95659aBf3",
        "pairedWith": "WETH"
      }
    ]
  }
}

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