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OP Mainnet ERC-20 Whale & Large-Trade Tracker
x402
OP Mainnet 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 2026-10-30).
Returns buy/sell trade history, volume summary, net flow, and top whale wallets for an ERC-20 token on OP Mainnet over a configurable time window, sourced from its deepest WETH/USDC pools on Uniswap v3 or Velodrome.
Price / call$0.02
Success—
StatusUnknown
How this service works
Whale and large-trade tracker for an ERC-20 on OP Mainnet: every buy and sell in the last N minutes on the token's deepest WETH/USDC pools (Uniswap v3 or Velodrome), 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
Returns a JSON object with: chain and token metadata (symbol, address, decimals); the block and time range queried; a summary with total buys, sells, buy volume USD, sell volume USD, net flow USD, and largest single trade; top buyer and seller wallets with their net USD, trades count, bought and sold amounts; and a list of large individual trades each with tx hash, DEX name, USD size, side, block, wallet, approximate timestamp, and token/quote amounts.
Example use cases
Whale alert before a token trade
“Before I buy into this Optimism token at 0x4200000000000000000000000000000000000042, show me who's been buying and selling the most in the last 30 minutes and what the net flow looks like — only show trades over $500.”
Smart money wallet identification
“Who are the top 5 wallets that bought the most of token 0x4200000000000000000000000000000000000042 on Optimism in the last two hours? I want their total USD bought and number of trades.”
DeFi trading bot sell-pressure monitor
“Check if there's been heavy sell pressure on 0x4200000000000000000000000000000000000042 on OP Mainnet in the last 15 minutes — show me total sell volume vs buy volume and the largest individual sell transactions.”
Technical details
Endpoint
GEThttps://onchaincheck.dev/optimism/trades?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time whale and large-trade surveillance specifically for an ERC-20 token on OP Mainnet (Optimism), using its deepest Uniswap v3 or Velodrome WETH/USDC liquidity pools. It is best when you need wallet-level attribution (who bought/sold the most), net flow directional signal, and individual large trade details in a single call. Prefer this over generic block explorers when you want structured, aggregated DeFi trade analytics without parsing raw logs. Not suitable for tokens without WETH/USDC pool depth on Optimism, or for chains other than OP Mainnet.
Side effects
- Invalid or non-OP-Mainnet token address returns an error or empty result
- Token with no WETH/USDC pool depth returns no trades (pools not tracked)
- minutes parameter outside 5–240 range may be clamped or rejected
- minUsd filter set too high returns an empty large-trades list while summary still populated
- Network or RPC issues on Optimism may return a 5xx or timeout
- Payment not sent or insufficient (x402 protocol) results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "optimism",
"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": "OP",
"address": "0x4200000000000000000000000000000000000042",
"decimals": 18
},
"window": {
"to": "2026-10-22T16:23:21.000Z",
"from": "2026-10-22T15:23:21.000Z",
"minutes": 60,
"toBlock": 158543712,
"fromBlock": 158541912
},
"summary": {
"buys": 31,
"sells": 10,
"trades": 41,
"netFlowUsd": 963.893,
"buyVolumeUsd": 1464.88,
"sellVolumeUsd": 500.992,
"largestTradeUsd": 136.298
},
"nativeUsd": 2392.72,
"topBuyers": [
{
"netUsd": 654.5,
"trades": 6,
"wallet": "0xF104e69537346E54BCbDB5a1280aE3Aeef092c5B",
"soldUsd": 0,
"boughtUsd": 654.5
},
{
"netUsd": 164.6,
"trades": 8,
"wallet": "0x78126dAC3a2C08479d2196741Da77F56Ca8CFB88",
"soldUsd": 29.98,
"boughtUsd": 194.5
},
{
"netUsd": 152.4,
"trades": 6,
"wallet": "0x042f093b5D3e35C3cFa891E461f165e2BDF3A4BC",
"soldUsd": 49.23,
"boughtUsd": 201.7
},
{
"netUsd": 125.8,
"trades": 1,
"wallet": "0x092772CdEF109fEd26052E79B952Ac5404f1Ed21",
"soldUsd": 0,
"boughtUsd": 125.8
},
{
"netUsd": 21.35,
"trades": 1,
"wallet": "0xf4c2BAA132722670CC0Eb89C8a9329eE8F2389ED",
"soldUsd": 0,
"boughtUsd": 21.35
}
],
"topSellers": [
{
"netUsd": -232.5,
"trades": 2,
"wallet": "0x31074ff71CE53897194028316A355F98F2043D88",
"soldUsd": 232.5,
"boughtUsd": 0
},
{
"netUsd": -9.994,
"trades": 1,
"wallet": "0x6663F9524b76B547F1070E82ddE1Cc0A2236d758",
"soldUsd": 9.994,
"boughtUsd": 0
}
],
"largeTrades": [
{
"tx": "0x3abbe44d8a518056071465655f99749236a6038dc9bd74d13908020a2d916f08",
"dex": "uniswap-v3",
"usd": 136.298,
"side": "sell",
"block": 158542191,
"wallet": "0x31074ff71CE53897194028316A355F98F2043D88",
"approxTime": "2026-10-22T15:32:39.000Z",
"quoteAmount": 0.056963409,
"quoteSymbol": "WETH",
"tokenAmount": 1146.4553
},
{
"tx": "0x2f24b77a43957031dc2920de3d7053e2982c0e7d6f4dbac01ee987bdaeca0e97",
"dex": "uniswap-v3",
"usd": 125.834,
"side": "buy",
"block": 158542384,
"wallet": "0x092772CdEF109fEd26052E79B952Ac5404f1Ed21",
"approxTime": "2026-10-22T15:39:05.000Z",
"quoteAmount": 0.052590179,
"quoteSymbol": "WETH",
"tokenAmount": 1051.44
},
{
"tx": "0xd2e4ef821f04a1ccdde0e63b134ea69a36b846025b544f0903a736911d6af6a0",
"dex": "uniswap-v3",
"usd": 120.034,
"side": "buy",
"block": 158542226,
"wallet": "0xF104e69537346E54BCbDB5a1280aE3Aeef092c5B",
"approxTime": "2026-10-22T15:33:49.000Z",
"quoteAmount": 0.050166382,
"quoteSymbol": "WETH",
"tokenAmount": 1003.3283
},
{
"tx": "0x75489fd0b28be01ba509303315fbad4df8a447c0bbcde4e2d15641f5b7458f49",
"dex": "uniswap-v3",
"usd": 119.403,
"side": "buy",
"block": 158542217,
"wallet": "0xF104e69537346E54BCbDB5a1280aE3Aeef092c5B",
"approxTime": "2026-10-22T15:33:31.000Z",
"quoteAmount": 0.049902608,
"quoteSymbol": "WETH",
"tokenAmount": 998.35308
},
{
"tx": "0x5b717b635a7e6d7bfa095ed872b8a597a6feb87b176db2e8e32d3c5ae045dd1a",
"dex": "uniswap-v3",
"usd": 113.131,
"side": "buy",
"block": 158543036,
"wallet": "0xF104e69537346E54BCbDB5a1280aE3Aeef092c5B",
"approxTime": "2026-10-22T16:00:49.000Z",
"quoteAmount": 0.047281406,
"quoteSymbol": "WETH",
"tokenAmount": 944.27912
}
],
"poolsScanned": [
{
"dex": "uniswap-v3",
"pool": "0x68F5C0A2DE713a54991E01858Fd27a3832401849",
"pairedWith": "WETH"
},
{
"dex": "velodrome",
"pool": "0xd25711EdfBf747efCE181442Cc1D8F5F8fc8a0D3",
"pairedWith": "WETH"
},
{
"dex": "uniswap-v3",
"pool": "0xB533c12fB4e7b53b5524EAb9b47d93fF6C7A456F",
"pairedWith": "USDC"
}
]
}
}Tags
x402
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