{"id":"2362889d-f017-4b7e-a7ac-c00bff48d0ce","shortId":"wE9Pje","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 portfolio holdings data for a specified portfolio (portfolio ID 1 in this case). It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. There are no API keys, no rate limits, and no subscription commitments — each request is paid individually.\n\nThe platform advertises a uniform $0.02/request pricing across all its endpoints. Documentation beyond the landing page is extremely thin; the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the holdings response and the expected POST body are unknown.","tags":[],"capabilities":["portfolio-holdings","x402-micropayment","usdc-payment","base-network","json-api","per-request-billing"],"categories":["finance","data"],"synonyms":["portfolio API","holdings endpoint","investment holdings","portfolio data","crypto portfolio","x402 finance API","micropayment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt","No OpenAPI or JSON schema for request or response bodies","The actual content and structure of the holdings response is unknown","Portfolio ID '1' is hardcoded in the endpoint path; unclear if other portfolio IDs are accessible or how they are obtained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/1/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/1/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no example payloads. The actual data returned is entirely unknown, making this effectively a stub 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'/docs':157 '/pricing':158 '/readme':161 '/request':142 '0.02':10,22,117,141 '000':108 '1':39 '20':107 '402':197 '6':113 'accept':74 'across':144 'actual':201 'addit':172 'advertis':138 'ai/ml':53 'amount':102 'analyt':52 'api':59,122 'avail':188 'base':8,20,70,109 'base-network' 'behind':62 'beyond':149 'bodi':211 'broader':48 'call':105 'caller':87 'case':42 'challeng':198 'commit':130 'confirm':192 'connect':167 'crypto portfolio' 'data':32,51 'decim':114 'detail':174 'document':148,183 'endpoint':26,73,147,190 'equal':116 'exampl':186 'expect':209 'extrem':154 'finance/web3':55 'gate':61 'handl':82 'header':94 'hold':3,15,31,205 'holdings endpoint' 'id':38 'includ':89 'individu':135 'infer':54 'infrastructur':57 'investment holdings' 'json':79 'json-api' 'key':123 'land':151 'limit':126 'live':193 'lowpaymentfee.com':28 'maximum':101 'micropay':6,18,64 'micropayment API' 'must':88 'network':71 'offer':50 'openapi':178 'page':152,162 'paid':134 'part':45 'payload':187 'payment':80,93,98 'per':11,23,104 'per-request-billing' 'platform':49,137 'portfolio':2,14,30,36,37 'portfolio API' 'portfolio data' 'portfolio-holdings' 'post':75,210 'price':143 'prompt':169 'proof':99 'proper':196 'protocol':86 'rate':125 'render':164 'request':12,24,76,132 'request/response':181 'requir':103 'respons':206 'retriev':1,13 'return':29,78,194 'schema':182 'settl':65 'shape':202 'spec':179 'specifi':35 'subscript':129 'technic':173 'thin':155 'uniform':140 'unit':110 'unknown':213 'usd':118 'usdc':67,112 'usdc-payment' 'util':58 'valid':97 'via':4,16,83 'wallet':168 'x':92 'x-payment':91 'x402':5,17,63,85 'x402 finance API' 'x402-micropayment'","prices":[{"id":"26ea2b8f-4ac3-4c45-8944-70099fbbbe5b","listingId":"2362889d-f017-4b7e-a7ac-c00bff48d0ce","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/1/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":"2026-04-18T18:52:17.045Z"}],"sources":[{"listingId":"2362889d-f017-4b7e-a7ac-c00bff48d0ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/1/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:17.045Z","lastSeenAt":"2026-04-28T06:34:17.279Z"}],"details":{"listingId":"2362889d-f017-4b7e-a7ac-c00bff48d0ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/1/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/1/holdings"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings for a portfolio in an automated trading or analytics pipeline","Agent-driven portfolio monitoring with per-request micropayments","Integrating portfolio data into dashboards without API key management"],"bestFor":["Agents or bots that need on-demand portfolio holdings data without subscription overhead","Developers wanting frictionless pay-per-call access to financial data on Base","Low-volume or sporadic consumers who prefer micropayments over monthly plans"],"notFor":["High-frequency consumers who need bulk or streaming portfolio data at lower marginal cost","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.666Z"},"updatedAt":"2026-04-28T06:34:17.279Z"}}