{"id":"174e3e96-6b11-4ca2-aa1f-35dbc5e688af","shortId":"GaPFfv","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 39. 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 data, and utility services — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/39/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 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 further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint path suggests it returns a list of asset holdings for a specific portfolio, but the exact schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-call","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","asset allocation","portfolio positions","crypto portfolio","holdings data","x402 finance API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format is unknown","The endpoint is for a hardcoded portfolio ID (39); unclear if other portfolio IDs are accessible or what they represent","No information on rate limits, uptime guarantees, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/39/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/39/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of this specific endpoint (portfolio 39 holdings) is only inferrable from the URL path. This is effectively a stub 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'0.02':11,24,69,122 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':111 '20':105 '2913':112 '300':138 '39':37 '6':118 'accept':86,188 'ai/ml':59 'analyt':58 'api':54,148 'asset':198 'asset allocation' 'base':9,22,80,107,114 'bodi':187 'broader':43 'call':53,124 'challeng':94 'confirm':95 'connect':157 'contain':181 'content':163 'crawl':146 'crypto portfolio' 'data':4,17,33,57,62 'decim':119 'descript':174 'doc':147 'document':141 'dozen':48 'endpoint':28,55,84,97,190 'equal':121 'exact':131,206 'exampl':171 'extrem':143 'field':177 'finance/web3':61 'hold':3,16,32,179,199 'holdings data' 'id':36 'infer':60 'investment holdings' 'json':91 'json-api' 'list':196 'live':99 'lowpaymentfee.com':30,45 'made':127 'maximum':102 'micropay':7,20 'network':81 'offer':47 'openapi':167 'page':152 'paramet':184 'part':40 'path':191 'pay':51 'pay-per-cal':50 'pay-per-call' 'payment':103,125 'per':12,25,52,70,123 'platform':44 'portfolio':2,15,35,203 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':87,186 'price':67,149 'prompt':159 'readm':151 'request':13,26,71,88 'request/response':170 'requir':100 'respons':180 'retriev':1,14 'return':31,90,154,194 'schema':168,207 'scheme':132 'second':139 'servic':65 'settl':73 'sinc':115 'span':56 'spars':144 'specif':83,202 'suggest':192 'timeout':140 'unit':108 'unknown':209 'usdc':77,110,116 'usdc-base' 'use':76,117 'util':64 'via':5,18,74,128 'wallet':134,158 'x402':6,19,75,93,130 'x402 finance API' 'x402-payment'","prices":[{"id":"27b77469-ee81-436e-8e03-6b6a1c503051","listingId":"174e3e96-6b11-4ca2-aa1f-35dbc5e688af","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/39/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":"2026-04-18T18:52:41.738Z"}],"sources":[{"listingId":"174e3e96-6b11-4ca2-aa1f-35dbc5e688af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/39/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:41.738Z","lastSeenAt":"2026-04-27T22:33:20.690Z"}],"details":{"listingId":"174e3e96-6b11-4ca2-aa1f-35dbc5e688af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/39/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 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/39/holdings"},{"claim":"The platform 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/39/holdings"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or analytics tools","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing on-demand portfolio holdings without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic portfolio data lookups at $0.02 per call"],"notFor":["High-frequency trading requiring sub-second latency and bulk data","Users who need detailed API documentation and guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.521Z"},"updatedAt":"2026-04-27T22:33:20.690Z"}}