Tool detail

mempool-anomaly

Returns a real-time mempool anomaly score for Ethereum or Base: gas price vs 20-block median, pending whale swaps and contract-deploy counts.

Categories: Onchain data

Use when

monitor for MEV or sandwich-attack signals before they land on-chain
watch for gas spikes and whale pending transactions

Not for

not a guaranteed alert - a score/signal, not an execution block

Inputs

GET query param: chain (string, optional, default ethereum; ethereum or base)

Admitted input schema

{
  "type": "object",
  "properties": {
    "chain": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Blockchain: ethereum or base (default: ethereum)"
    }
  },
  "required": [],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://anomaly.forgemesh.io/api/mempool-anomaly

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://anomaly.forgemesh.io/api/mempool-anomaly
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z