{"id":"14dfebbb-57ba-4cb4-a5f4-3ca589f9a466","shortId":"BKrJGf","kind":"x402","title":"Track large wallet movements and whale transactions on Base via x402 micropayments.","tagline":"Track large wallet movements and whale transactions on Base via x402 micropayments.","description":"The Silverback whale-moves endpoint tracks large wallet movements and whale transactions on EVM chains (defaulting to Base, chain ID 8453). It is part of the Silverback x402 DeFi Intelligence API, which provides 11 pay-per-use endpoints for DeFi analysis, execution, and market intelligence. Payment is handled via the x402 micropayment protocol using USDC on Base, Solana, or SKALE.\n\nThe whale-moves endpoint accepts POST requests with optional parameters: a token contract address, a minimum USD value threshold (default $100,000), a result limit (default 10, max 50), and a chain ID. The response includes whale transaction data with summary information, net flow analysis, and top buyers/sellers. The endpoint costs $0.02 per call, settled in USDC.\n\nSilverback positions itself as autonomous DeFi infrastructure for the agent economy. All endpoints return JSON with a `success` boolean field. The API supports both GET (query params) and POST (JSON body) on most endpoints. A 15% discount is available when paying with the $BACK token via Permit2 on Base.","tags":[],"capabilities":["whale-tracking","on-chain-analytics","large-transaction-detection","net-flow-analysis","x402-micropayments","usdc-payment","base-chain","evm-compatible"],"categories":["defi","blockchain-analytics"],"synonyms":["whale tracker","large wallet movements","whale transactions","big wallet monitor","whale alert","on-chain whale detection","large transfer tracker","smart money tracking"],"warnings":["Docs link (https://docs.silverbackdefi.app/) was not crawled; the /docs path on the x402 subdomain returns 404.","The x402 challenge object captured is empty — payment details (accepts array) were not included in the probe.","No example response schema is provided in the OpenAPI spec; response structure is inferred from the summary only.","All request parameters are optional per the schema — calling with no body may return generic/default whale data."],"endpointUrl":"https://x402.silverbackdefi.app/api/v1/whale-moves","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"20000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"20000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"20000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"20000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370261979,"paymentId":"3bfb4573-78c3-4ddc-830a-d8b5e915b41b","amountHuman":"0.020000","description":"Monitor whale movements including buys, sells, and transfers for any token","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}]},"qualityScore":"0.720","qualityRationale":"Full OpenAPI schema with clear endpoint description, parameters, and pricing. The endpoint is live (402 challenge captured). However, no example response body is available, the docs link returns a 404, and the 402 challenge object is empty, so exact payment details (token address, amount in base units) are not directly confirmed from the 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'000':109 '10':114 '100':108 '11':59 '15':180 '50':116 '8453':46 'accept':92 'address':101 'agent':154 'analysi':67,132 'api':56,166 'autonom':149 'avail':183 'back':188 'base':9,21,43,83,193 'base-chain' 'big wallet monitor' 'bodi':175 'boolean':163 'buyers/sellers':135 'call':141 'chain':40,44,119 'contract':100 'cost':138 'data':126 'default':41,107,113 'defi':54,66,150 'discount':181 'economi':155 'endpoint':30,64,91,137,157,178 'evm':39 'evm-compatible' 'execut':68 'field':164 'flow':131 'get':169 'handl':74 'id':45,120 'includ':123 'inform':129 'infrastructur':151 'intellig':55,71 'json':159,174 'larg':2,14,32 'large transfer tracker' 'large wallet movements' 'large-transaction-detection' 'limit':112 'market':70 'max':115 'micropay':12,24,78 'minimum':103 'move':29,90 'movement':4,16,34 'net':130 'net-flow-analysis' 'on-chain whale detection' 'on-chain-analytics' 'option':96 'param':171 'paramet':97 'part':49 'pay':61,185 'pay-per-us':60 'payment':72 'per':62,140 'permit2':191 'posit':146 'post':93,173 'protocol':79 'provid':58 'queri':170 'request':94 'respons':122 'result':111 'return':158 'settl':142 'silverback':26,52,145 'skale':86 'smart money tracking' 'solana':84 'success':162 'summari':128 'support':167 'threshold':106 'token':99,189 'top':134 'track':1,13,31 'transact':7,19,37,125 'usd':104 'usdc':81,144 'usdc-payment' 'use':63,80 'valu':105 'via':10,22,75,190 'wallet':3,15,33 'whale':6,18,28,36,89,124 'whale alert' 'whale tracker' 'whale transactions' 'whale-mov':27,88 'whale-tracking' 'x402':11,23,53,77 'x402-micropayments'","prices":[{"id":"ab392675-30c1-4c53-ab84-f41ed1b928e7","listingId":"14dfebbb-57ba-4cb4-a5f4-3ca589f9a466","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"20000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"20000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"20000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"20000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370261979,"paymentId":"3bfb4573-78c3-4ddc-830a-d8b5e915b41b","amountHuman":"0.020000","description":"Monitor whale movements including buys, sells, and transfers for any token","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.907Z"}],"sources":[{"listingId":"14dfebbb-57ba-4cb4-a5f4-3ca589f9a466","source":"x402_bazaar","sourceId":"https://x402.silverbackdefi.app/api/v1/whale-moves","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.907Z","lastSeenAt":"2026-04-22T04:02:49.137Z"}],"details":{"listingId":"14dfebbb-57ba-4cb4-a5f4-3ca589f9a466","quickStartSnippet":"curl -X POST https://x402.silverbackdefi.app/api/v1/whale-moves \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"token\": \"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\", \"minValueUsd\": 100000, \"limit\": 10, \"chainId\": 8453}'","exampleRequest":{"limit":10,"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","chainId":8453,"minValueUsd":100000},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Whale-moves endpoint costs $0.02 per call","source_url":"https://x402.silverbackdefi.app"},{"claim":"Endpoint tracks large wallet movements and whale transactions","source_url":"https://x402.silverbackdefi.app"},{"claim":"Default chain is Base (8453), default minValueUsd is 100000, default limit is 10, max 50","source_url":"https://x402.silverbackdefi.app"},{"claim":"Silverback provides 11 pay-per-use endpoints via x402 micropayments with USDC on Base, Solana, and SKALE","source_url":"https://x402.silverbackdefi.app"},{"claim":"15% discount available when paying with $BACK token via Permit2 on Base","source_url":"https://x402.silverbackdefi.app"},{"claim":"Response includes whale moves with summary, net flow, top buyers/sellers","source_url":"https://x402.silverbackdefi.app"}],"useCases":["Monitor large token transfers to detect accumulation or distribution patterns","Identify top buyers and sellers for a specific token on Base","Analyze net flow of whale transactions to gauge market sentiment","Build automated trading signals based on whale activity","Integrate whale movement data into DeFi agent decision-making pipelines"],"bestFor":["AI agents needing real-time whale movement intelligence via pay-per-use","DeFi traders monitoring large wallet activity for trading signals","On-chain analysts tracking token accumulation and distribution","Developers building automated DeFi strategies that react to whale moves"],"notFor":["Historical whale data over long time periods (endpoint appears to return recent moves only)","Non-EVM chains other than Base (chain ID must be specified, defaults to 8453)","Free or subscription-based access — requires x402 micropayment per call"],"kindDetails":{},"updatedAt":"2026-04-22T01:02:48.090Z"}}