{"id":"a48ed92d-3b9e-40c4-a2e1-c8b38f0ade4b","shortId":"g35SAJ","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02/request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 8. 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 market data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/8/holdings` accepts POST requests and is priced at $0.02 per call (20,000 base units of USDC on Base, which uses 6 decimals). Payment is settled on-chain via USDC (contract 0x8335…2913) to the payee address 0x1A2B…85F3. No API keys or rate limits are required; access is granted instantly upon valid x402 payment. The endpoint returns JSON.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render 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 expects. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data is returned or how to structure a request body.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request body schema or response schema provided; callers must guess at the POST body format","The endpoint is for a specific portfolio ID (8) with no explanation of what this portfolio represents","No OpenAPI or machine-readable schema discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/8/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/8/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 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and the site's docs pages are empty stubs. The purpose of 'portfolio 8 holdings' is not explained anywhere. This is effectively a stub 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'/request':12,24 '0.02':11,23,87 '000':91 '0x1a2b':117 '0x8335':111 '20':90 '2913':112 '402':197 '6':100 '8':35 '85f3':118 'accept':80 'access':127 'address':116 'ai/ml':57 'analyt':56 'api':52,120,148 'base':9,21,74,92,97 'behind':67 'bodi':187,220 'broader':41 'call':51,89 'chain':107 'challeng':198 'confirm':192 'connect':157 'contain':181 'content':163 'contract':110 'crypto portfolio' 'data':4,16,31,55,61,211 'decim':101 'descript':174 'difficult':206 'doc':147 'document':139,203 'dozen':46 'endpoint':26,53,78,136,190 'exact':209 'exampl':171 'expect':188 'extrem':144 'field':177 'finance/web3':59 'gate':66 'grant':129 'hold':3,15,30,179 'holdings endpoint' 'id':34 'infer':58 'infrastructur':63 'instant':130 'investment holdings' 'json':138 'json-api' 'key':121 'know':208 'lack':201 'limit':124 'live':193 'lowpaymentfee.com':28,43 'make':204 'market':60 'micropay':7,19 'network':75 'offer':45 'on-chain':105 'openapi':167 'page':152 'paramet':184 'part':38 'pay':49 'pay-per-cal':48 'pay-per-request' 'paye':115 'payment':70,102,134 'per':50,88 'platform':42 'portfolio':2,14,33 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':81,186 'price':85,149 'prompt':159 'proper':196 'protocol':71 'rate':123 'readm':151 'render':154 'request':82,219 'request/response':170 'requir':126 'respons':180 'retriev':1,13 'return':29,137,194,213 'schema':168 'settl':104 'site':142 'span':54 'spars':145 'specif':77 'structur':217 'unit':93 'upon':131 'usdc':95,109 'usdc-base' 'use':99 'util':64 'valid':132 'via':5,17,108 'wallet':158 'x402':6,18,69,133 'x402 finance API' 'x402-payment'","prices":[{"id":"310788a4-9097-4de4-a2f4-dc09a615834a","listingId":"a48ed92d-3b9e-40c4-a2e1-c8b38f0ade4b","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/8/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":"2026-04-18T18:53:36.257Z"}],"sources":[{"listingId":"a48ed92d-3b9e-40c4-a2e1-c8b38f0ade4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/8/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:36.257Z","lastSeenAt":"2026-04-27T15:34:26.348Z"}],"details":{"listingId":"a48ed92d-3b9e-40c4-a2e1-c8b38f0ade4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/8/holdings"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, 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/8/holdings"}],"useCases":["Fetching current holdings for a specific portfolio","Integrating portfolio data into trading dashboards","Automated portfolio monitoring by AI agents"],"bestFor":["Agents needing on-demand portfolio holdings without API key signup","Developers wanting pay-per-call access to portfolio data on Base","Micropayment-gated financial data retrieval"],"notFor":["Users who need detailed API documentation before integrating","Bulk historical portfolio data downloads (no evidence of batch support)","Non-crypto-native users unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.901Z"},"updatedAt":"2026-04-27T15:34:26.348Z"}}