{"id":"fc4fa2be-d4a3-444c-867f-ffd8e45630bb","shortId":"MyYcGc","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 70. It is part of a broader platform offering various paid API endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid.\n\nThe specific data returned by this holdings endpoint is not documented in detail. The platform's landing page lists this under a \"Finance & Web3\" umbrella alongside price feeds, exchange rates, token quotes, and gas estimates, but the exact schema of the holdings response is unknown. No OpenAPI spec or detailed documentation was found; the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","Base USDC API","micropayment API","pay-per-call holdings"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Docs, pricing, and README pages all return only a 'Connect wallet' prompt with no useful content","The specific meaning of 'portfolio 70' is undocumented; it is unclear what holdings data is returned","This endpoint path is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/70/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/70/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no example responses, and the docs pages are empty. The purpose of 'portfolio 70 holdings' is unexplained, making this effectively a stub 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'000':106 '20':105 '6':116 '70':36 'Base USDC API' 'accept':70 'across':49 'addit':203 'ai/ml':51 'alongsid':160 'amount':100 'api':47,121 'base':8,20,64,97,107 'broader':42 'call':103 'caller':84 'categori':55 'commit':129 'connect':198 'content':204 'crypto portfolio data' 'data':3,15,32,137 'data/analytics':50 'decim':117 'detail':147,184 'doc':189 'document':145,185 'endpoint':26,48,69,142 'estim':169 'exact':172 'exchang':163 'feed':162 'financ':157 'finance/web3':52 'found':187 'gas':168 'handl':78 'header':90 'hold':2,14,31,141,176 'id':35 'includ':85 'independ':133 'infrastructur':54 'inlin':79 'investment holdings' 'json':75 'json-response' 'key':122 'land':151 'limit':125 'list':153 'lowpaymentfee.com':28 'maximum':99 'micropay':6,18 'micropayment API' 'network':9,21,65 'no-api-key' 'offer':44 'openapi':181 'page':152,193 'paid':46,134 'part':39 'pay-per-call holdings' 'payment':76,89,95 'per':11,23,102 'per-request-pricing' 'platform':43,149 'portfolio':1,13,30,34 'portfolio holdings API' 'portfolio-holdings' 'post':71 'price':161,190 'prompt':200 'protocol':61,83 'quot':166 'rate':124,164 'readm':192 'render':195 'request':12,24,72,131 'requir':101 'respons':177 'return':29,74,138 'schema':173 'settl':57 'sign':93 'sinc':113 'spec':182 'specif':136 'subscript':128 'token':165 'umbrella':159 'unit':108 'unknown':179 'usd':112 'usdc':67,94,110,114 'usdc-base' 'use':66,115 'various':45 'via':4,16,58,80 'wallet':199 'web3':158 'x':88 'x-payment':87 'x402':5,17,60,82 'x402 finance API' 'x402-payment'","prices":[{"id":"ef6effc2-8124-4916-82ed-3bc1b37a3555","listingId":"fc4fa2be-d4a3-444c-867f-ffd8e45630bb","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/70/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":"2026-04-18T18:53:15.199Z"}],"sources":[{"listingId":"fc4fa2be-d4a3-444c-867f-ffd8e45630bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/70/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:15.199Z","lastSeenAt":"2026-04-27T18:36:24.444Z"}],"details":{"listingId":"fc4fa2be-d4a3-444c-867f-ffd8e45630bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/70/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 requiring 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/70/holdings"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages render only 'Connect wallet' with no additional documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve holdings data for a specific portfolio via a single paid API call","Integrate portfolio data into trading bots or dashboards without managing API keys","Agent-driven portfolio monitoring with per-request USDC micropayments"],"bestFor":["Agents or apps needing on-demand portfolio holdings without subscriptions","Developers who want keyless, pay-per-use financial data endpoints","x402-native workflows on the Base network"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-frequency bulk data retrieval where per-request pricing adds up","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.9Z"},"updatedAt":"2026-04-27T18:36:24.444Z"}}