{"uid":"cap_eksV4_pHqkUIUmXa64A7d","slug":"ethereum-wallet-shared-counterparty-sybil-airdrop-farmer-check-22fd3078","name":"Ethereum Wallet Shared Counterparty / Sybil Airdrop Farmer Check","description":"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.","url":"https://api.fadeandco.workers.dev/api/agent-intel/sybil-airdrop-farmer-check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"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"}}}}},"responseSchema":{"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}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bnSfaftm6QJggJ1dXhUP8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks 2–10 Ethereum wallets for shared counterparties across recent transactions to detect possible Sybil clusters or coordinated airdrop farming","exampleAgentPrompt":"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.","exampleUseCases":[{"title":"Airdrop Sybil screening before distribution","prompt":"Before we send out our token airdrop, can you check these six wallet addresses for me — 0xAAA..., 0xBBB..., 0xCCC..., 0xDDD..., 0xEEE..., 0xFFF... — and flag any that share counterparties? I'm trying to catch Sybil farmers before they claim."},{"title":"Investigating suspected coordinated wallets","prompt":"I'm looking into these three Ethereum addresses that all applied for our whitelist: 0x111..., 0x222..., 0x333.... Can you check if they share any common transaction counterparties that might indicate they're run by the same person?"},{"title":"On-chain due diligence for a multi-wallet investor","prompt":"We've got two investor wallet addresses — 0xd8da6bf26964af9d7eed9e03e53415d37aa96045 and 0xfbfeaf0da0f2fde5c66df570133ae35f3eb58c9a — and I want to know if they're secretly connected by shared on-chain counterparties before we finalize the cap table."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T00:33:53.838Z","isFirstParty":false,"canonicalSlug":"ethereum-wallet-shared-counterparty-sybil-airdrop-farmer-check-22fd3078"}