{"id":"77ea00c2-8c65-4c45-8e58-f8695cd596cd","shortId":"KU8w66","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 41. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/41/holdings` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint 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 address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a timeout of 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical documentation. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact structure of the holdings response and what request body parameters are accepted (if any) remain unknown.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio positions","asset allocation endpoint","holdings data","x402 finance API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No request body schema or response schema documented; callers must guess at the payload format","The endpoint references a hardcoded portfolio ID (41); it is unclear how to discover or specify other portfolios","The platform lists many endpoint categories but this specific endpoint (/portfolios/41/holdings) is not listed on the landing page, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/41/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/41/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 and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only 'Connect wallet'. The purpose of 'portfolio 41 holdings' is opaque — it is unclear whether this returns real financial data or placeholder 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'/api/v1/portfolios/41/holdings':82 '/docs':153 '/pricing':155 '/readme':157 '0.02':10,22,66,119 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':108 '20':102 '2913':109 '300':137 '41':35 '6':115 'accept':83,197 'across':54 'address':131 'ai/ml':57 'analyt':56 'api':52 'asset allocation endpoint' 'avail':147,183 'base':8,20,77,104,111 'bodi':194 'broader':41 'call':51,121 'categori':62 'challeng':91 'confirm':92 'connect':163 'data':31,55 'decim':116 'document':139,170 'dozen':46 'endpoint':26,53,81,94,148 'equal':118 'exact':128,185 'exampl':181 'extrem':141 'finance/web3':59 'hold':3,15,30,189 'holdings data' 'id':34 'infer':58 'infrastructur':61 'investment holdings' 'json':88 'json-api' 'land':144 'list':146 'live':96 'lowpaymentfee.com':28,43 'made':124 'maximum':99 'micropay':6,18 'network':78 'offer':45 'openapi':174 'page':145,158 'paramet':195 'part':38 'pay':49 'pay-per-cal':48 'pay-per-request' 'payload':182 'payment':100,122 'per':11,23,50,67,120 'platform':42 'portfolio':2,14,33 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':84 'price':64,150 'prompt':165 'remain':200 'render':160 'request':12,24,68,85,193 'request/response':177 'requir':97 'respons':190 'retriev':1,13 'return':29,87 'schema':178 'scheme':129 'second':138 'settl':70 'sinc':112 'spars':142 'spec':175 'specif':80 'structur':186 'technic':169 'timeout':135 'unit':105 'unknown':201 'usdc':74,107,113 'usdc-base' 'use':73,114 'via':4,16,71,125 'wallet':164 'x402':5,17,72,90,127 'x402 finance API' 'x402-payment'","prices":[{"id":"60f2f842-35a8-4e8e-a8c0-85942f7d79ef","listingId":"77ea00c2-8c65-4c45-8e58-f8695cd596cd","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/41/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":"2026-04-18T18:52:39.970Z"}],"sources":[{"listingId":"77ea00c2-8c65-4c45-8e58-f8695cd596cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/41/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.970Z","lastSeenAt":"2026-04-27T22:33:20.634Z"}],"details":{"listingId":"77ea00c2-8c65-4c45-8e58-f8695cd596cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/41/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/41/holdings"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio programmatically","Integrating portfolio data into dashboards or trading bots","Agents querying portfolio composition before making investment decisions"],"bestFor":["Developers needing on-demand portfolio holdings data without API key management","AI agents that can settle x402 micropayments on Base","Low-volume consumers who prefer pay-per-call over subscriptions"],"notFor":["Users needing high-frequency bulk portfolio data (no documented batch endpoint)","Anyone requiring detailed API documentation or guaranteed SLAs before integrating","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.563Z"},"updatedAt":"2026-04-27T22:33:20.634Z"}}