{"id":"b4cee1e1-36d4-423b-ac2d-39769bc6bc25","shortId":"Sf45NA","kind":"x402","title":"Track whale wallet movements and large transactions on Base via x402 micropayments for $0.02/call.","tagline":"Track whale wallet movements and large transactions on Base via x402 micropayments for $0.02/call.","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 covering swap execution, technical analysis, yield intelligence, arbitrage scanning, token audits, portfolio tracking, and more — all payable via x402 micropayments in USDC on Base, Solana, or SKALE.\n\nThe whale-moves endpoint accepts a POST request 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 a summary, net flow, and top buyers/sellers. Pricing is fixed at $0.02 per call, settled in USDC via the x402 protocol. No subscription or API key is required — callers pay per request by signing a USDC authorization.\n\nThe endpoint is live and returns a 402 Payment Required challenge as expected for x402 endpoints. The OpenAPI 3.1.0 spec is well-documented with full schema definitions for all 11 endpoints. External documentation is referenced at docs.silverbackdefi.app, though the /docs path on the Render deployment itself returns a 404.","tags":[],"capabilities":["whale-tracking","on-chain-analytics","large-transaction-detection","evm-chain-support","x402-micropayments","usdc-settlement","base-chain","defi-intelligence","pay-per-use"],"categories":["defi","blockchain","analytics"],"synonyms":["whale tracker","large wallet movements","whale transactions","on-chain whale detection","big wallet tracker","whale alert","whale watcher","smart money tracking"],"warnings":["The /docs path on the Render deployment returns 404; external docs at docs.silverbackdefi.app were not crawled.","The x402 challenge object captured was empty — payment parameters (asset, amount, network) could not be independently verified from the probe, only from the OpenAPI spec.","No example response body is available; response schema for whale-moves is undocumented beyond a brief description."],"endpointUrl":"https://silverback-x402.onrender.com/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":1771370260868,"paymentId":"c4aed3e6-8635-4287-8e1c-7a6ab715ae4e","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 3.1.0 schema with clear endpoint definitions, pricing, and parameter descriptions. The endpoint is live (402 challenge captured). However, no example response body is available, the external docs link is broken on the Render deployment, and the 402 challenge object was empty so exact payment details (asset address, amount in base units) could not be independently verified from the 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'/docs':217 '0.02':14,29,151 '000':121 '10':126 '100':120 '11':65,207 '3.1.0':195 '402':184 '404':226 '50':128 '8453':52 'accept':103 'address':113 'analysi':75 'api':62,164 'arbitrag':78 'audit':81 'author':176 'base':9,24,49,94 'base-chain' 'big wallet tracker' 'buyers/sellers':146 'call':153 'caller':168 'chain':46,50,131 'challeng':187 'contract':112 'cover':71 'data':138 'default':47,119,125 'defi':60 'defi-intelligence' 'definit':204 'deploy':222 'docs.silverbackdefi.app':214 'document':200,210 'endpoint':36,70,102,178,192,208 'evm':45 'evm-chain-support' 'execut':73 'expect':189 'extern':209 'fix':149 'flow':143 'full':202 'id':51,132 'includ':135 'intellig':61,77 'key':165 'larg':6,21,38 'large wallet movements' 'large-transaction-detection' 'limit':124 'live':180 'max':127 'micropay':12,27,90 'minimum':115 'move':35,101 'movement':4,19,40 'net':142 'on-chain whale detection' 'on-chain-analytics' 'openapi':194 'option':108 'paramet':109 'part':55 'path':218 'pay':67,169 'pay-per-us':66 'pay-per-use' 'payabl':87 'payment':185 'per':68,152,170 'portfolio':82 'post':105 'price':147 'protocol':160 'provid':64 'referenc':212 'render':221 'request':106,171 'requir':167,186 'respons':134 'result':123 'return':182,224 'scan':79 'schema':203 'settl':154 'sign':173 'silverback':32,58 'skale':97 'smart money tracking' 'solana':95 'spec':196 'subscript':162 'summari':141 'swap':72 'technic':74 'though':215 'threshold':118 'token':80,111 'top':145 'track':1,16,37,83 'transact':7,22,43,137 'usd':116 'usdc':92,156,175 'usdc-settlement' 'use':69 'valu':117 'via':10,25,88,157 'wallet':3,18,39 'well':199 'well-docu':198 'whale':2,17,34,42,100,136 'whale alert' 'whale tracker' 'whale transactions' 'whale watcher' 'whale-mov':33,99 'whale-tracking' 'x402':11,26,59,89,159,191 'x402-micropayments' 'yield':76","prices":[{"id":"41d8c419-e437-4b66-8ab3-88b272ae64cd","listingId":"b4cee1e1-36d4-423b-ac2d-39769bc6bc25","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":1771370260868,"paymentId":"c4aed3e6-8635-4287-8e1c-7a6ab715ae4e","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":"2026-04-21T18:32:34.230Z"}],"sources":[{"listingId":"b4cee1e1-36d4-423b-ac2d-39769bc6bc25","source":"x402_bazaar","sourceId":"https://silverback-x402.onrender.com/api/v1/whale-moves","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.230Z","lastSeenAt":"2026-04-22T05:32:25.874Z"}],"details":{"listingId":"b4cee1e1-36d4-423b-ac2d-39769bc6bc25","quickStartSnippet":"curl -X POST https://silverback-x402.onrender.com/api/v1/whale-moves \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"token\": \"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\", \"minValueUsd\": 100000, \"limit\": 10, \"chainId\": 8453}'\n# Returns 402 — complete x402 payment flow to receive whale data","exampleRequest":{"limit":10,"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","chainId":8453,"minValueUsd":100000},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Whale-moves endpoint is priced at $0.02 per call","source_url":"https://silverback-x402.onrender.com"},{"claim":"Silverback provides 11 pay-per-use endpoints via x402 micropayments in USDC on Base, Solana, and SKALE","source_url":"https://silverback-x402.onrender.com"},{"claim":"Whale-moves endpoint accepts token, minValueUsd, limit, and chainId parameters and returns whale moves with summary, net flow, top buyers/sellers","source_url":"https://silverback-x402.onrender.com"},{"claim":"Default chain is Base (8453)","source_url":"https://silverback-x402.onrender.com"},{"claim":"The endpoint returned a 402 status confirming it is live","source_url":"https://silverback-x402.onrender.com/api/v1/whale-moves"}],"useCases":["Monitor large token transfers to detect whale accumulation or distribution patterns","Track net flow of whale activity for a specific token before making trading decisions","Build automated alerts for significant wallet movements exceeding a USD threshold","Integrate whale intelligence into a DeFi trading bot for signal generation","Analyze top buyers and sellers of a token to gauge institutional interest"],"bestFor":["AI agents needing on-demand whale transaction data without API keys","DeFi trading bots that want pay-per-use on-chain intelligence","Developers building whale-alert dashboards on Base"],"notFor":["Historical whale data spanning months or years (endpoint returns recent moves)","Non-EVM chains other than those supported (defaults to Base 8453)","Free or subscription-based access — every call requires an x402 USDC payment"],"kindDetails":{},"updatedAt":"2026-04-22T01:07:56.222Z"}}