{"id":"271edadb-5aa4-4836-ba8f-31267d3caa81","shortId":"GYTRRe","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 46. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/46/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site's uniform $0.02/request pricing. No API keys are required; access is granted purely through the x402 payment header. The platform advertises no rate limits and instant access.\n\nDocumentation 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 accepts. The endpoint appears live (402 challenge returned successfully), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","portfolio positions","asset allocation API","holdings data","crypto portfolio"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No request body schema or response schema documented; callers must guess at the POST body format.","It is unclear what 'portfolio 46' refers to or whether other portfolio IDs are available.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/46/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/46/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, but there is zero documentation on request parameters, response schema, or what 'portfolio 46' represents. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/request':127 '0.02':10,22,117,126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20000':107 '402':203 '46':35 '6':112 'accept':82,198 'access':134,151 'advertis':103,145 'ai/ml':57 'analyt':56 'api':53,130,158 'appear':201 'asset allocation API' 'base':8,20,74,97,108 'behind':67 'bodi':197 'broader':41 'call':52 'chain':93 'challeng':102,204 'connect':167 'consist':120 'contain':191 'content':173 'contract':98 'crypto portfolio' 'data':31,55,61 'decim':113 'descript':184 'difficult':214 'doc':157 'document':152,211 'endpoint':26,80,200 'equal':116 'exampl':181 'experiment':218 'extrem':154 'field':187 'finance/web3':59 'gate':66 'grant':136 'header':142 'hold':3,15,30,189 'holdings data' 'id':34 'infer':58 'instant':150 'investment holdings' 'json':87 'key':131 'lack':209 'limit':148 'live':202 'lowpaymentfee.com':28,43 'make':212 'market':60 'maxamountrequir':105 'micropay':6,18 'network':75 'no-api-key' 'offer':45 'on-chain':91 'openapi':177 'page':162 'paramet':194 'part':38 'pay':50 'pay-per-cal':49 'pay-per-request' 'payment':70,88,141 'per':11,23,51,118 'platform':42,144 'portfolio':2,14,33 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':83,196 'price':128,159 'prompt':169 'protocol':71 'pure':137 'rate':147 'readm':161 'render':164 'request':12,24,84,119 'request/response':180 'requir':133 'respons':190 'retriev':1,13 'return':29,86,205 'schema':178 'servic':64 'settl':90 'site':123 'span':54 'spars':155 'specif':79 'success':206 'uniform':125 'unit':109 'usdc':77,95,115 'usdc-base' 'use':76,216 'util':63 'varieti':47 'via':4,16,94 'wallet':168 'without':217 'x402':5,17,69,101,140 'x402-payment'","prices":[{"id":"44271684-6717-41f6-85e9-aea585821e41","listingId":"271edadb-5aa4-4836-ba8f-31267d3caa81","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/46/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":"2026-04-18T18:52:59.021Z"}],"sources":[{"listingId":"271edadb-5aa4-4836-ba8f-31267d3caa81","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/46/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:59.021Z","lastSeenAt":"2026-04-28T09:06:26.098Z"}],"details":{"listingId":"271edadb-5aa4-4836-ba8f-31267d3caa81","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/46/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/46/holdings"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/46/holdings"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving current holdings for a specific portfolio","Integrating portfolio data into dashboards or trading bots","Automated portfolio monitoring and reporting"],"bestFor":["Developers wanting keyless, pay-per-call portfolio data access","Agents that can settle x402 payments on Base with USDC","Quick one-off portfolio lookups without subscription commitments"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who would prefer subscription-based pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.601Z"},"updatedAt":"2026-04-28T09:06:26.098Z"}}