{"id":"d1384fa0-1d19-49f8-9627-b01dfa1e8cc3","shortId":"FFLJ5a","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 78. 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/78/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. 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 verified.\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 or what parameters the POST body accepts. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know the exact request format or response shape without experimentation.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","holdings endpoint","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format is unknown","The specific portfolio (ID 78) is hardcoded in the URL with no explanation of what it represents","Response format and fields are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/78/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/78/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, but there is zero documentation on request parameters, response schema, or what 'portfolio 78 holdings' actually contains. No OpenAPI spec, no examples, and all doc pages render only 'Connect wallet'. This is effectively a stub 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'pay-per-request' 'payment':71,108,126,131,147 'per':12,25,52,106 'platform':44 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':82,197 'price':86,159 'prompt':170 'proof':132 'proper':207 'protocol':72 'rate':136 'readm':162 'render':165 'request':13,26,83,222 'request/response':181 'requir':142 'respons':191,225 'retriev':1,14 'return':31,205 'schema':179 'scheme':118 'servic':65 'settl':110 'shape':226 'sign':130 'site':153 'span':56 'spars':156 'specif':78 'unit':94 'upfront':139 'usdc':96 'usdc-base' 'util':64 'verifi':149 'via':5,18,114 'wallet':169 'without':227 'x':125 'x-payment':124 'x402':6,19,70,116 'x402 finance API' 'x402-payment'","prices":[{"id":"642479af-63a4-4dd7-9b4d-946843c974f9","listingId":"d1384fa0-1d19-49f8-9627-b01dfa1e8cc3","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/78/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":"2026-04-18T18:53:25.475Z"}],"sources":[{"listingId":"d1384fa0-1d19-49f8-9627-b01dfa1e8cc3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/78/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:25.475Z","lastSeenAt":"2026-04-28T03:05:39.391Z"}],"details":{"listingId":"d1384fa0-1d19-49f8-9627-b01dfa1e8cc3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/78/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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/78/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/78/holdings"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio programmatically","Integrating portfolio data into dashboards or trading bots","Agents that need on-demand portfolio composition data without managing API keys"],"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 who need detailed API documentation or OpenAPI specs before integrating","Bulk data retrieval where per-request pricing would be cost-prohibitive","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.367Z"},"updatedAt":"2026-04-28T03:05:39.391Z"}}