{"id":"d817a3d9-985a-4490-8b78-c5e0b104d70e","shortId":"FW7fEg","kind":"x402","title":"Pay-per-use DeFi intelligence and execution via x402 micropayments on Base, Solana, and SKALE.","tagline":"Pay-per-use DeFi intelligence and execution via x402 micropayments on Base, Solana, and SKALE.","description":"Silverback is an autonomous DeFi infrastructure API designed for the agent economy. It exposes 11 pay-per-use endpoints covering swap execution, technical analysis, DeFi yield intelligence, arbitrage scanning, token security audits, whale tracking, wallet portfolio lookups, liquidity pool analysis, swap quotes (Base and Solana via Jupiter), and token holder analytics. All endpoints use the x402 micropayment protocol, accepting USDC on Base, Solana, and SKALE (with a 15% discount available when paying with the $BACK token via Permit2 on Base).\n\nThe specific endpoint listed here — `/api/v1/agent-reputation` — is NOT documented in the OpenAPI spec, which covers 11 other paths. Probing this endpoint returned 404 on both GET and POST, meaning it is either deprecated, not yet deployed, or unlisted. The broader Silverback API platform is live (root returns 200, OpenAPI spec is well-structured), but this particular path cannot be confirmed as functional.\n\nPricing across the documented Silverback endpoints ranges from $0.01 (pool analysis, swap quotes, holder analytics) to $0.05 (swap execution). Payments settle in USDC. All responses return JSON with a `success` boolean field. Token identifiers use CoinGecko IDs for market data or 0x contract addresses for on-chain operations, defaulting to Base (chain ID 8453) unless otherwise specified.","tags":[],"capabilities":["defi-intelligence","token-swap","technical-analysis","yield-optimization","arbitrage-scanning","token-security-audit","whale-tracking","wallet-portfolio","liquidity-pool-analysis","swap-quote","jupiter-dex-quote","holder-analytics","x402-micropayments","erc-8004-identity"],"categories":["defi","crypto","finance"],"synonyms":["DeFi API","crypto intelligence","swap routing","yield farming API","token audit","whale tracker","liquidity analysis","arbitrage scanner","x402 DeFi","agent economy API"],"warnings":["The /api/v1/agent-reputation endpoint returned 404 on both GET and POST — it is not live or not publicly accessible.","This endpoint is absent from the OpenAPI specification which documents 11 other paths.","The docs link (https://docs.silverbackdefi.app/) was not crawled; external documentation status is unknown.","The OpenAPI server URL (https://x402.silverbackdefi.app) differs from the probed origin (https://silverback-x402.onrender.com) — the endpoint may only be live at the canonical server URL."],"endpointUrl":"https://silverback-x402.onrender.com/api/v1/agent-reputation","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","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":"5000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370265951,"paymentId":"b3939ddb-bb56-4fdd-a9a6-bb9d50d53faa","amountHuman":"0.005000","description":"Get comprehensive reputation profile for an ERC-8004 registered agent","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}]},"qualityScore":"0.300","qualityRationale":"The specific endpoint `/api/v1/agent-reputation` returned 404 on both GET and POST and is not documented in the OpenAPI spec. The broader Silverback platform is live and well-documented with 11 other endpoints, but this particular path appears non-functional or unlisted. Score reflects the endpoint-specific unavailability despite good surrounding 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'0.01':185 '0.05':193 '0x':218 '11':47,129 '15':101 '200':161 '404':136 '8453':231 'DeFi API' 'accept':92 'across':178 'address':220 'agent':43 'agent economy API' 'analysi':57,73,187 'analyt':84,191 'api':39,155 'arbitrag':61 'arbitrage scanner' 'arbitrage-scanning' 'audit':65 'autonom':36 'avail':103 'back':108 'base':13,29,76,95,113,228 'boolean':207 'broader':153 'cannot':172 'chain':224,229 'coingecko':212 'confirm':174 'contract':219 'cover':53,128 'crypto intelligence' 'data':216 'default':226 'defi':5,21,37,58 'defi-intelligence' 'deploy':149 'deprec':146 'design':40 'discount':102 'document':122,180 'economi':44 'either':145 'endpoint':52,86,116,134,182 'erc-8004-identity' 'execut':8,24,55,195 'expos':46 'field':208 'function':176 'get':139 'holder':83,190 'holder-analytics' 'id':213,230 'identifi':210 'infrastructur':38 'intellig':6,22,60 'json':203 'jupit':80 'jupiter-dex-quote' 'liquid':71 'liquidity analysis' 'liquidity-pool-analysis' 'list':117 'live':158 'lookup':70 'market':215 'mean':142 'micropay':11,27,90 'on-chain':222 'openapi':125,162 'oper':225 'otherwis':233 'particular':170 'path':131,171 'pay':2,18,49,105 'pay-per-us':1,17,48 'payment':196 'per':3,19,50 'permit2':111 'platform':156 'pool':72,186 'portfolio':69 'post':141 'price':177 'probe':132 'protocol':91 'quot':75,189 'rang':183 'respons':201 'return':135,160,202 'root':159 'scan':62 'secur':64 'settl':197 'silverback':33,154,181 'skale':16,32,98 'solana':14,30,78,96 'spec':126,163 'specif':115 'specifi':234 'structur':167 'success':206 'swap':54,74,188,194 'swap routing' 'swap-quote' 'technic':56 'technical-analysis' 'token':63,82,109,209 'token audit' 'token-security-audit' 'token-swap' 'track':67 'unless':232 'unlist':151 'usdc':93,199 'use':4,20,51,87,211 'via':9,25,79,110 'wallet':68 'wallet-portfolio' 'well':166 'well-structur':165 'whale':66 'whale tracker' 'whale-tracking' 'x402':10,26,89 'x402 DeFi' 'x402-micropayments' 'yet':148 'yield':59 'yield farming API' 'yield-optimization'","prices":[{"id":"a33bd1db-4586-42ab-a350-ceb3d6133333","listingId":"d817a3d9-985a-4490-8b78-c5e0b104d70e","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":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","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":"5000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370265951,"paymentId":"b3939ddb-bb56-4fdd-a9a6-bb9d50d53faa","amountHuman":"0.005000","description":"Get comprehensive reputation profile for an ERC-8004 registered agent","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.188Z"}],"sources":[{"listingId":"d817a3d9-985a-4490-8b78-c5e0b104d70e","source":"x402_bazaar","sourceId":"https://silverback-x402.onrender.com/api/v1/agent-reputation","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.188Z","lastSeenAt":"2026-04-22T04:02:47.789Z"}],"details":{"listingId":"d817a3d9-985a-4490-8b78-c5e0b104d70e","quickStartSnippet":"# Get a swap quote on Base (requires x402 payment)\ncurl -X POST https://x402.silverbackdefi.app/api/v1/swap-quote \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"tokenIn\": \"WETH\", \"tokenOut\": \"USDC\", \"amountIn\": \"1.0\"}'","exampleRequest":{"tokenIn":"WETH","amountIn":"1.0","tokenOut":"USDC"},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Silverback provides 11 pay-per-use endpoints via x402 micropayments with USDC on Base, Solana, and SKALE","source_url":"https://silverback-x402.onrender.com"},{"claim":"Pricing ranges from $0.01 to $0.05 per call across endpoint tiers","source_url":"https://silverback-x402.onrender.com"},{"claim":"$BACK token payments via Permit2 on Base offer a 15% discount","source_url":"https://silverback-x402.onrender.com"},{"claim":"The /api/v1/agent-reputation endpoint returned 404 on POST and GET probes","source_url":"https://silverback-x402.onrender.com/api/v1/agent-reputation"},{"claim":"The OpenAPI spec lists the canonical server as https://x402.silverbackdefi.app","source_url":"https://silverback-x402.onrender.com"}],"useCases":["Autonomous agents performing DeFi trades and portfolio rebalancing on Base","Security-checking tokens before purchase via honeypot and ownership risk audits","Monitoring whale wallet movements to detect large market-moving transactions","Scanning cross-DEX arbitrage opportunities with spread analysis","Getting Jupiter DEX swap quotes on Solana for routing optimization"],"bestFor":["AI agents needing pay-per-call DeFi data without subscriptions","Developers building autonomous trading or portfolio management bots","On-chain analysts who want programmatic access to whale and holder data"],"notFor":["Users needing historical time-series data or charting (this is point-in-time intelligence)","Applications requiring free or subscription-based pricing models","Non-crypto use cases with no DeFi component"],"kindDetails":{},"updatedAt":"2026-04-22T00:53:18.095Z"}}