{"id":"7bc1d322-c30f-485c-b1e2-e957f721aea2","shortId":"U4HVxh","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 34. 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 gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/34/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme, meaning the caller attaches a one-shot USDC payment in the X-PAYMENT header. No API keys, rate limits, or subscriptions are required — access is instant once payment is included.\n\nDocumentation on the platform 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 POST body (if any) is expected. The endpoint is confirmed live (HTTP 402 challenge captured), but the lack of documentation makes it difficult to know exactly what data is returned or how to structure a request body.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","Base USDC API","pay-per-call holdings","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The endpoint is for a hardcoded portfolio ID (34); unclear if other portfolio IDs are available or what this portfolio represents","Response content and structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/34/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/34/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 'Connect wallet' with no content. The purpose of portfolio 34 specifically is unexplained. This is effectively a stub 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'/api/v1/portfolios/34/holdings':80 '/docs':162 '/pricing':164 '/readme':166 '0.02':11,24,103 '000':92 '0x8335':97 '20':91 '2913':98 '34':37 '402':211 '6':108 'Base USDC API' 'accept':81 'access':146 'ai/ml':59 'analyt':58 'api':54,138 'attach':124 'base':9,22,75,93,100 'behind':68 'bodi':200,235 'broader':43 'call':53,105 'caller':123 'captur':213 'chain':115 'challeng':212 'confirm':208 'connect':172 'contain':196 'content':178 'crawl':161 'crypto portfolio data' 'data':4,17,33,57,62,226 'decim':109 'descript':189 'difficult':221 'document':153,218 'dozen':48 'endpoint':28,55,79,206 'equal':102 'exact':119,224 'exampl':186 'expect':204 'extrem':158 'field':192 'finance/web3':61 'gate':67 'header':136 'hold':3,16,32,194 'http':210 'id':36 'includ':152 'infer':60 'instant':148 'investment holdings' 'key':139 'know':223 'lack':216 'limit':141 'live':209 'lowpaymentfee' 'lowpaymentfee.com':30,45 'make':219 'maximum':89 'mean':121 'micropay':7,20 'network':76 'no-api-key' 'offer':47 'on-chain':113 'one':127 'one-shot':126 'openapi':182 'page':167 'part':40 'pay':51 'pay-per-cal':50 'pay-per-call holdings' 'pay-per-request' 'payment':71,110,130,135,150 'per':12,25,52,104 'platform':44,156 'portfolio':2,15,35 'portfolio holdings API' 'portfolio-holdings' 'post':82,199 'price':86 'prompt':174 'protocol':72 'rate':140 'request':13,26,83,234 'request/response':185 'requir':145 'respons':195 'retriev':1,14 'return':31,169,228 'schema':183 'scheme':120 'servic':65 'settl':112 'shot':128 'span':56 'spars':159 'specif':78 'structur':232 'subscript':143 'unit':94 'usdc':96,106,129 'usdc-base' 'use':107 'util':64 'via':5,18,116 'wallet':173 'x':134 'x-payment':133 'x402':6,19,70,118 'x402 finance API' 'x402-payment'","prices":[{"id":"17da5f1d-2c88-4741-aceb-da7852466238","listingId":"7bc1d322-c30f-485c-b1e2-e957f721aea2","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/34/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":"2026-04-18T18:52:48.262Z"}],"sources":[{"listingId":"7bc1d322-c30f-485c-b1e2-e957f721aea2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/34/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:48.262Z","lastSeenAt":"2026-04-27T22:33:20.944Z"}],"details":{"listingId":"7bc1d322-c30f-485c-b1e2-e957f721aea2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/34/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":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/holdings"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/holdings"},{"claim":"Platform advertises $0.02/request pricing 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) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio on-demand","Integrating portfolio data into trading bots or dashboards without API key management","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers wanting keyless, pay-per-use portfolio data access","AI agents that can settle x402 payments on Base","Users who need occasional portfolio lookups without subscription commitments"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-frequency bulk data retrieval where per-call pricing becomes expensive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.197Z"},"updatedAt":"2026-04-27T22:33:20.944Z"}}