{"id":"b32be0a2-f831-4e33-9868-8e7625273411","shortId":"duLCbQ","kind":"x402","title":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 3. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/3/holdings` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 \"exact\" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint's purpose — portfolio holdings — is inferred solely from the URL path and the site's \"Finance & Web3\" category listing. The actual request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","json-api","micropayment"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","crypto portfolio","asset allocation","holdings data","x402 finance API","Base USDC API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt","No OpenAPI or JSON schema for request or response bodies","The endpoint path includes a hardcoded portfolio ID (3); it is unclear if other portfolio IDs are supported or what data is returned","The platform appears to be a generic demo or showcase site with many listed endpoints but no substantive documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/3/holdings","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/3/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual data returned is unknown — the endpoint's purpose is inferred only from its URL path. This is effectively a stub 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'/api/v1/portfolios/3/holdings':82 '/docs':143 '/pricing':145 '/readme':147 '0.02':10,22,66,118 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':107 '20':101 '2913':108 '3':35 '300':134 '6':114 'Base USDC API' 'accept':83 'actual':195 'addit':158 'ai/ml':57 'analyt':56 'api':52 'asset allocation' 'avail':172 'base':8,20,77,103,110 'bodi':197 'broader':41 'call':51,120 'categori':192 'challeng':91 'confirm':92 'connect':153 'content':159 'crawl':142 'crypto portfolio' 'data':31,55 'decim':115 'document':137 'dozen':46 'endpoint':26,53,81,174 'equal':117 'exact':127 'exampl':170 'extrem':139 'financ':190 'finance/web3':59 'format':198 'hold':3,15,30,178 'holdings data' 'id':34 'infer':58,180 'infrastructur':61 'investment holdings' 'json':88 'json-api' 'list':193 'live':95 'lowpaymentfee.com':28,43 'made':123 'maximum':98 'micropay':6,18 'micropayment' 'network':78 'offer':45 'openapi':163 'page':148 'part':38 'path':185 'pay':49 'pay-per-cal':48 'pay-per-request' 'payload':171 'payment':99,121 'per':11,23,50,67,119 'platform':42 'portfolio':2,14,33,177 'portfolio holdings API' 'portfolio-holdings' 'post':84 'price':64 'prompt':155 'purpos':176 'request':12,24,68,85,196 'request/response':166 'requir':96 'respons':200 'retriev':1,13 'return':29,87,150 'schema':167 'scheme':128 'second':135 'settl':70 'sinc':111 'site':188 'sole':181 'span':54 'spars':140 'spec':164 'specif':80 'structur':201 'timeout':136 'unit':104 'unknown':203 'url':184 'usdc':74,106,112 'usdc-base' 'use':73,113 'util':62 'via':4,16,71,124 'wallet':130,154 'web3':191 'x402':5,17,72,90,126 'x402 finance API' 'x402-payment'","prices":[{"id":"f0f6e8bd-d4ff-4772-8c47-9f716f44c268","listingId":"b32be0a2-f831-4e33-9868-8e7625273411","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/3/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:30.280Z"}],"sources":[{"listingId":"b32be0a2-f831-4e33-9868-8e7625273411","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/3/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:30.280Z","lastSeenAt":"2026-04-28T04:34:05.577Z"}],"details":{"listingId":"b32be0a2-f831-4e33-9868-8e7625273411","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/3/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/3/holdings"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio","Integrating portfolio data into dashboards or trading bots","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing keyless, pay-per-call portfolio data access","AI agents that can settle x402 payments on Base","Users who want no-commitment API access without subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would prefer bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.03Z"},"updatedAt":"2026-04-28T04:34:05.577Z"}}