{"id":"6f0dcd67-6bed-4319-a90c-8a286a92953c","shortId":"78z8ZG","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 27. 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 priced at $0.02 per request and settled via x402 micropayments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/27/holdings` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the payee address `0x1A2B…85F3` on Base. No API keys, accounts, or rate limits are required — access is granted per-payment.\n\nDocumentation on the site is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive 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 (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-micropayment","usdc-payment","base-network","portfolio-holdings","json-api","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","USDC micropayment API","Base network API","lowpaymentfee","crypto portfolio data"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all return only a wallet-connect prompt with no content.","No OpenAPI or JSON schema describing request body or response format for this endpoint.","The endpoint path /api/v1/portfolios/27/holdings is not listed among the site's advertised APIs; it may be an unlisted or experimental route.","Request body format is unknown — POST method is specified but no input schema is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/27/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/27/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 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint (portfolios/27/holdings) is not even listed on the site's own catalog. This is effectively a stub 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'/api/v1/portfolios/27/holdings':87 '/docs':159 '/pricing':161 '/readme':163 '0.02':11,24,70,121 '000':118 '0x1a2b':131 '20':117 '27':37 '402':207 '6':125 '85f3':132 'Base network API' 'USDC micropayment API' 'accept':88 'access':144 'account':138 'address':130 'ai/ml':59 'analyt':58 'api':54,136 'attach':103 'base':9,22,82,119,134 'base-network' 'bodi':197 'broader':43 'call':53 'caller':102 'captur':209 'challeng':208 'confirm':205 'connect':169 'contain':109,193 'content':175 'crawl':158 'crypto portfolio data' 'data':4,17,33,57,63 'decim':126 'descript':186 'difficult':217 'document':150,214 'dozen':48 'endpoint':28,55,86,203 'exampl':183 'expect':201 'experiment':221 'extrem':155 'field':189 'finance/web3':61 'grant':146 'handl':96 'header':108 'hold':3,16,32,191 'id':36 'infer':60 'infrastructur':65 'inlin':97 'investment holdings' 'json':93 'json-api' 'key':137 'lack':212 'limit':141 'live':206 'lowpaymentfee' 'lowpaymentfee.com':30,45 'make':215 'market':62 'micropay':7,20,77 'network':83 'offer':47 'openapi':179 'page':164 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'paye':129 'payment':94,107,113,149 'per':12,25,52,71,148 'per-pay':147 'platform':44 'portfolio':2,15,35 'portfolio holdings API' 'portfolio-holdings' 'post':89,196 'price':68 'prompt':171 'protocol':101 'rate':140 'request':13,26,72,90 'request/response':182 'requir':143 'respons':192 'retriev':1,14 'return':31,92,166 'schema':180 'settl':74 'sign':111 'sinc':122 'site':153 'span':56 'spars':156 'specif':85 'substant':174 'unit':120 'usdc':79,112,123 'usdc-payment' 'use':124,219 'util':66 'via':5,18,75,98 'wallet':170 'without':220 'x':106 'x-payment':105 'x402':6,19,76,100 'x402 finance API' 'x402-micropayment'","prices":[{"id":"c1e8bdfa-c4bc-4da5-b1e0-0e3f2125dd17","listingId":"6f0dcd67-6bed-4319-a90c-8a286a92953c","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/27/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":"2026-04-18T18:52:29.673Z"}],"sources":[{"listingId":"6f0dcd67-6bed-4319-a90c-8a286a92953c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/27/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:29.673Z","lastSeenAt":"2026-04-28T05:04:34.909Z"}],"details":{"listingId":"6f0dcd67-6bed-4319-a90c-8a286a92953c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/27/holdings \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/27/holdings"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and 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/27/holdings"}],"useCases":["Fetching holdings data for a specific portfolio programmatically","Integrating portfolio position data into trading dashboards or bots","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Users who prefer micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","Bulk data retrieval where per-call pricing would be expensive at scale","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.031Z"},"updatedAt":"2026-04-28T05:04:34.909Z"}}