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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 onchaincheck.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns all buys and sells for an ERC-20 token on Base over the last N minutes, including USD size, side, wallet, transaction hash, buy/sell volume, net flow, and top buying/selling wallets.
Price / call$0.02
Success—
StatusUnknown
How this service works
Whale and large-trade tracker for an ERC-20 on Base: every buy and sell in the last N minutes on the token's deepest WETH/USDC pools (Uniswap v3 or Aerodrome), with USD size, side, wallet and transaction for the largest trades, buy/sell volume and net flow, and the wallets that bought or sold the most.
Output
A JSON object with: chain identifier, token metadata (symbol, address, decimals), the query window (from/to timestamps and block range), a summary (buy/sell counts, total trades, buy/sell volume in USD, net flow, largest trade), ETH/USD price used for conversions, an ordered list of top buyers (wallet, trades, bought/sold/net USD), an ordered list of top sellers, and an array of large individual trades (tx hash, DEX, USD size, buy/sell side, block number, wallet, approximate timestamp, quote and token amounts). Covers the 3 deepest WETH/USDC pools on Uniswap v3 or Aerodrome.
Example use cases
Spot unusual whale accumulation on a new Base token
“Check if there's been any whale buying activity above $5000 for the token at 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed on Base in the last 30 minutes — show me the top buyers and the net flow.”
Monitor sell pressure during a price drop
“I need to see all sells for the Base token 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed over the past 2 hours, with the top sellers and total sell volume in USD — let me know if the sell side is dominating.”
Pre-trade due diligence on token liquidity and activity
“Before I buy into this Base token at 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed, can you pull up the last 90 minutes of trading activity — how many trades happened, who's buying the most, and what's the largest single trade?”
Technical details
Endpoint
GEThttps://onchaincheck.dev/base/trades?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need on-chain trade-level detail for a specific ERC-20 on Base — who is buying/selling, how large, and which wallets dominate flow — rather than just price or balance data. Ideal for whale monitoring, momentum detection, sell-pressure analysis, and pre-trade due diligence on Base tokens. Use the Arbitrum sibling endpoint for the same analysis on Arbitrum One.
Side effects
- Missing or invalid token address returns a validation error
- minutes outside 5-240 range may be rejected or capped
- token with no liquidity on tracked pools returns empty trade arrays
- limit value outside 1-40 range rejected by pattern validation
- minUsd set very high may return no trades even if activity exists
- network issues or RPC timeouts may produce 5xx errors
- very recent blocks may not yet be indexed
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"
}
]
}
}Tags
x402
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