{"id":"17c3fead-ea0a-4d5c-a0d9-b20f4d2170a3","shortId":"cjmZjU","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 97. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header.\n\nDocumentation beyond the landing page is extremely sparse. The /docs, /api, /pricing, and /README pages all render 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-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","Base USDC micropayment API","lowpaymentfee portfolio","crypto portfolio data"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.","No request body schema documented; unclear what POST body (if any) is expected.","No response schema or example; the contents of the holdings response are unknown.","The endpoint is hardcoded to portfolio ID 97; it is unclear whether other portfolio IDs are available or how they are obtained.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/97/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/97/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request format, response schema, or what 'portfolio 97 holdings' actually contains. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/docs':142 '/pricing':144 '/readme':146 '0.02':11,24,103 '000':98 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':91 '20':97 '402':190 '6':108 '97':37 'Base USDC micropayment API' 'accept':77 'ai/ml':57 'analyt':56 'api':52,113 'base':9,22,73,89,99 'behind':66 'beyond':134 'bodi':180 'broader':43 'call':51,123 'captur':192 'challeng':191 'commit':121 'confirm':188 'connect':152 'contain':176 'content':158 'contract':90 'cost':95 'crypto portfolio data' 'data':4,17,33,55,60 'decim':109 'descript':169 'difficult':200 'document':133,197 'dozen':46 'endpoint':28,53,76,186 'equal':102 'exampl':166 'expect':184 'experiment':204 'extrem':139 'field':172 'finance/web3':59 'gate':65 'header':132 'hold':3,16,32,174 'id':36 'individu':126 'infer':58 'infrastructur':62 'investment holdings' 'json':82 'json-response' 'key':114 'lack':195 'land':136 'limit':117 'live':189 'lowpaymentfee portfolio' 'lowpaymentfee.com':30 'make':198 'maximum':94 'micropay':7,20 'network':74 'no-api-key' 'offer':45 'openapi':162 'page':137,147 'paid':125 'part':40 'pay':49 'pay-per-cal':48 'pay-per-request' 'payment':69,83,131 'per':12,25,50,104 'platform':44 'portfolio':2,15,35 'portfolio holdings API' 'portfolio-holdings' 'post':78,179 'prompt':154 'protocol':70 'rate':116 'render':149 'request':13,26,79,105 'request/response':165 'respons':175 'retriev':1,14 'return':31,81 'schema':163 'settl':85 'span':54 'spars':140 'subscript':120 'substant':157 'unit':100 'usdc':87,106 'usdc-base' 'use':107,202 'util':63 'via':5,18,127 'wallet':153 'without':203 'x':130 'x-payment':129 'x402':6,19,68 'x402 finance API' 'x402-payment'","prices":[{"id":"b13f9b4a-5351-4c33-b7a7-1872f7cbd8b9","listingId":"17c3fead-ea0a-4d5c-a0d9-b20f4d2170a3","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/97/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":"2026-04-18T18:53:44.714Z"}],"sources":[{"listingId":"17c3fead-ea0a-4d5c-a0d9-b20f4d2170a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/97/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:44.714Z","lastSeenAt":"2026-04-27T12:34:56.553Z"}],"details":{"listingId":"17c3fead-ea0a-4d5c-a0d9-b20f4d2170a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/97/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/97/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/97/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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching holdings data for a specific portfolio programmatically","Integrating portfolio position data into dashboards or trading bots","Agent-driven portfolio analysis 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":["Anyone needing detailed API documentation or request/response schemas before integrating","Bulk data retrieval where per-request fees would accumulate significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.42Z"},"updatedAt":"2026-04-27T12:34:56.553Z"}}