{"id":"8a59ccd9-c9d9-4433-99b0-2aaa80ad00bb","shortId":"ZTkQqm","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 53. 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 utility services — all gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/53/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 includes an X-PAYMENT header with a signed payment proof. No API keys, rate limits, or upfront commitments are required — access is instant once payment is attached.\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 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 is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","no-api-key","micropayment"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","lowpaymentfee","Base USDC API","pay-per-call portfolio"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or JSON schema describing request parameters or response format.","The endpoint is hardcoded to portfolio ID 53; it is unclear whether other portfolio IDs are accessible or what this portfolio represents.","No request or response examples could be sourced."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/53/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/53/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 with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the specific portfolio 53 holdings endpoint is unclear beyond its URL path. Effectively a stub 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'/api/v1/portfolios/53/holdings':81 '/docs':162 '/pricing':164 '/readme':166 '0.02':11,24,104 '000':93 '0x8335':98 '20':92 '2913':99 '402':212 '53':37 '6':109 'Base USDC API' 'accept':82,203 'access':146 'ai/ml':59 'analyt':58 'api':54,137 'attach':152 'base':9,22,76,94,101 'behind':69 'bodi':202 'broader':43 'call':53,106 'caller':124 'chain':116 'challeng':214 'commit':143 'confirm':207 'connect':172 'contain':196 'content':178 'crawl':161 'crypto portfolio data' 'data':4,17,33,57,63 'decim':110 'descript':189 'difficult':222 'document':153,219 'dozen':48 'endpoint':28,55,80,205 'equal':103 'exact':120 'exampl':186 'experiment':226 'extrem':158 'field':192 'finance/web3':61 'gate':68 'header':130 'hold':3,16,32,194 'id':36 'includ':125 'infer':60 'instant':148 'investment holdings' 'key':138 'lack':217 'limit':140 'live':208 'lowpaymentfee' 'lowpaymentfee.com':30,45 'make':220 'market':62 'maximum':90 'mean':122 'micropay':7,20 'micropayment' 'network':77 'no-api-key' 'offer':47 'on-chain':114 'openapi':182 'page':167 'paramet':199 'part':40 'pay':51 'pay-per-cal':50 'pay-per-call portfolio' 'pay-per-request' 'payment':72,111,129,134,150 'per':12,25,52,105 'platform':44 'portfolio':2,15,35 'portfolio holdings API' 'portfolio-holdings' 'post':83,201 'price':87 'prompt':174 'proof':135 'proper':211 'protocol':73 'rate':139 'request':13,26,84 'request/response':185 'requir':145 'respons':195 'retriev':1,14 'return':31,169,209 'schema':183 'scheme':121 'servic':66 'settl':113 'sign':133 'site':156 'span':56 'spars':159 'specif':79 'unit':95 'upfront':142 'usdc':97,107 'usdc-base' 'use':108,224 'util':65 'via':5,18,117 'wallet':173 'without':225 'x':128 'x-payment':127 'x402':6,19,71,119,213 'x402 finance API' 'x402-payment'","prices":[{"id":"4ed3064e-43ce-4470-b931-670db8f99355","listingId":"8a59ccd9-c9d9-4433-99b0-2aaa80ad00bb","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/53/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":"2026-04-18T18:53:04.354Z"}],"sources":[{"listingId":"8a59ccd9-c9d9-4433-99b0-2aaa80ad00bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/53/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:04.354Z","lastSeenAt":"2026-04-27T21:34:10.150Z"}],"details":{"listingId":"8a59ccd9-c9d9-4433-99b0-2aaa80ad00bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53/holdings"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio in an automated trading or analytics pipeline","Agents that need on-demand portfolio composition data without managing API keys","Integrating portfolio data into dashboards or reporting tools via micropayment-gated access"],"bestFor":["Developers or agents wanting frictionless, key-free access to portfolio holdings data","Micropayment-based workflows on the Base network","Low-volume, on-demand portfolio data retrieval"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume bulk portfolio data ingestion (no documented batch endpoint)","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.369Z"},"updatedAt":"2026-04-27T21:34:10.150Z"}}