{"id":"89d88040-a6b2-499a-9436-62d031c73583","shortId":"xHXSpL","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 67. 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/67/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 subscriptions are required — each request is independently paid.\n\nDocumentation on the site is extremely sparse. The docs, pricing, API, and README pages all render 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. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers must discover the request format and response shape experimentally.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","no-api-key","crypto-settlement"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","Base USDC API","micropayment API","portfolio data","holdings endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or JSON schema describing request parameters or response format.","The specific portfolio (ID 67) is hardcoded in the URL with no explanation of what it represents.","Response content and data freshness are unknown — callers must discover the schema experimentally."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/67/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/67/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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The purpose of 'portfolio 67 holdings' is unexplained — it is unclear whether this is real financial data or a demo. Effectively a stub 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'0.02':11,24,103 '000':92 '0x8335':97 '20':91 '2913':98 '402':200 '6':108 '67':37 'Base USDC API' 'accept':81 'ai/ml':59 'analyt':58 'api':54,136,159 'base':9,22,75,93,100 'behind':68 'broader':43 'call':53,105 'caller':123,208 'chain':115 'challeng':201 'confirm':195 'connect':167 'contain':191 'content':173 'crypto-settlement' 'data':4,17,33,57,62 'decim':109 'descript':184 'discov':210 'doc':157 'document':149,206 'dozen':48 'endpoint':28,55,79,193 'equal':102 'exact':119 'exampl':181 'experiment':217 'extrem':154 'field':187 'finance/web3':61 'format':213 'gate':67 'header':129 'hold':3,16,32,189 'holdings endpoint' 'id':36 'includ':124 'independ':147 'infer':60 'investment holdings' 'key':137 'lack':204 'limit':139 'live':196 'lowpaymentfee.com':30,45 'maximum':89 'mean':121,207 'micropay':7,20 'micropayment API' 'must':209 'network':76 'no-api-key' 'offer':47 'on-chain':113 'openapi':177 'page':162 'paid':148 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':71,110,128,133 'per':12,25,52,104 'platform':44 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':82 'price':86,158 'prompt':169 'proof':134 'proper':199 'protocol':72 'rate':138 'readm':161 'render':164 'request':13,26,83,145,212 'request/response':180 'requir':143 'respons':190,215 'retriev':1,14 'return':31,197 'schema':178 'scheme':120 'servic':65 'settl':112 'shape':216 'sign':132 'site':152 'span':56 'spars':155 'specif':78 'subscript':141 'unit':94 'usdc':96,106 'usdc-base' 'use':107 'util':64 'via':5,18,116 'wallet':168 'x':127 'x-payment':126 'x402':6,19,70,118 'x402 finance API' 'x402-payment'","prices":[{"id":"efeff566-b905-4cb8-b209-0cfbb1ff7fe0","listingId":"89d88040-a6b2-499a-9436-62d031c73583","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/67/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":"2026-04-18T18:53:17.017Z"}],"sources":[{"listingId":"89d88040-a6b2-499a-9436-62d031c73583","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/67/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:17.017Z","lastSeenAt":"2026-04-27T18:36:24.508Z"}],"details":{"listingId":"89d88040-a6b2-499a-9436-62d031c73583","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/67/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 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/67/holdings"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching holdings data for a specific portfolio via automated agent","Integrating portfolio position data into a trading dashboard","Programmatic access to portfolio composition without API key management"],"bestFor":["Agents or bots that can pay per-call with USDC on Base","Developers wanting keyless, on-demand portfolio data access","x402-compatible clients looking for low-cost financial data endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk data consumers who need thousands of calls at volume-discounted rates","Anyone without a Base-compatible wallet or x402 payment capability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.813Z"},"updatedAt":"2026-04-27T18:36:24.508Z"}}