# Ethereum Wallet Shared Counterparty / Sybil Airdrop Farmer Check

> Ethereum Wallet Shared Counterparty / Sybil Airdrop Farmer Check is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Checks 2–10 Ethereum wallets for shared counterparties across recent transactions to detect possible Sybil clusters or coordinated airdrop farming

## Facts

- Endpoint: GET https://api.fadeandco.workers.dev/api/agent-intel/sybil-airdrop-farmer-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ethereum-wallet-shared-counterparty-sybil-airdrop-farmer-check-22fd3078
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eksV4_pHqkUIUmXa64A7d

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 ethereum-wallet-shared-counterparty-sybil-airdrop-farmer-check-22fd3078
```

Example prompt: Can you check whether these four Ethereum wallets are linked — 0xd8da6bf26964af9d7eed9e03e53415d37aa96045, 0xfbfeaf0da0f2fde5c66df570133ae35f3eb58c9a, 0xabc123..., 0xdef456... — by looking for shared counterparties in their recent transactions? I want to know if they might be Sybil or coordinated airdrop-farming wallets.

## When to prefer this

Use this endpoint when you need a fast, lightweight Sybil or cluster signal across 2–10 Ethereum wallets based on shared recent counterparties — ideal for pre-airdrop screening, whitelist vetting, or quick on-chain relationship checks. Prefer it over full graph-tracing tools when you want a rapid lead rather than a deep funding-source trace, and when you're comfortable with recent-transaction-only coverage. Not suited for deep historical analysis or tracing the origin of funds.

## Known failure modes

- Fewer than 2 or more than 10 wallets provided — request rejected
- Invalid Ethereum address format causes API error or empty result
- Blockscout API unavailability leads to timeout or error response
- Only the most recent 50 transactions per wallet are scanned — older coordination activity is missed
- Shared counterparties may be high-volume contracts (DEX routers, exchanges) producing false-positive cluster signals
- Wallets with very few transactions may produce inconclusive results

## How this service works

Checks 2 to 10 Ethereum wallets for shared counterparties: addresses that several of them sent to or received from in their most recent 50 transactions (Blockscout). Reports the shared addresses and a POSSIBLE_CLUSTER signal. Recent-page only, no funding-source trace, so it finds some clusters and misses others.

## Output

Returns a JSON object with a verdict (POSSIBLE_CLUSTER or NO_SHARED_COUNTERPARTY), a list of shared counterparty addresses found across the submitted wallets, the count of shared counterparties, per-wallet metadata (transactions scanned, whether older pages exist), the Blockscout data source URL, a timestamp, and a note that shared addresses may be exchanges or routers rather than proof of coordination.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "wallets"
     ],
     "properties": {
      "wallets": {
       "type": "string",
       "description": "2 to 10 Ethereum addresses separated by commas"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Only the most recent 50 transactions per wallet. A shared address can be an exchange or a router, so a signal is a lead, not proof.",
  "source": "https://eth.blockscout.com/api/v2/addresses/",
  "verdict": "NO_SHARED_COUNTERPARTY",
  "wallets": [
   {
    "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
    "olderPagesExist": true,
    "transactionsScanned": 50
   },
   {
    "address": "0xfbfeaf0da0f2fde5c66df570133ae35f3eb58c9a",
    "olderPagesExist": true,
    "transactionsScanned": 50
   }
  ],
  "checkedAt": "2026-10-23T09:35:18.663Z",
  "sharedCounterparties": [],
  "sharedCounterpartyCount": 0
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ethereum-wallet-shared-counterparty-sybil-airdrop-farmer-check-22fd3078/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fadeandco.workers.dev](https://www.zero.xyz/host/api.fadeandco.workers.dev/llms.txt)