{"id":"d5626a50-b630-4903-914f-033169a0edb9","shortId":"7NfWfB","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 38. 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 using USDC.\n\nThe specific endpoint `/api/v1/portfolios/38/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. No API keys are required; access is granted purely through the x402 payment header. The platform advertises no rate limits and instant access.\n\nDocumentation 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 parameters the POST body accepts. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know exactly what data is returned or how to structure a request body.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","USDC micropayment API","Base network API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt","No request body schema or response schema documented anywhere","Unknown what data portfolio 38 actually contains or whether the portfolio ID is meaningful to external users","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/38/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/38/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 parameters or response schema. The docs pages are empty (wallet-connect only). The endpoint path suggests portfolio holdings data but nothing confirms what fields are returned. Effectively a stub 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'/request':128 '0.02':11,24,118,127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20000':108 '38':37 '402':205 '6':113 'Base network API' 'USDC micropayment API' 'accept':83,199 'access':135,152 'advertis':104,146 'ai/ml':59 'analyt':58 'api':54,131,159 'base':9,22,75,98,109 'behind':68 'bodi':198,229 'broader':43 'call':53 'captur':207 'chain':94 'challeng':103,206 'confirm':203 'connect':168 'consist':121 'contain':192 'content':174 'contract':99 'crypto portfolio' 'data':4,17,33,57,62,220 'decim':114 'descript':185 'difficult':215 'doc':158 'document':153,212 'dozen':48 'endpoint':28,55,81,201 'equal':117 'exact':218 'exampl':182 'extrem':155 'field':188 'finance/web3':61 'gate':67 'grant':137 'header':143 'hold':3,16,32,190 'id':36 'infer':60 'instant':151 'investment holdings' 'json':88 'json-response' 'key':132 'know':217 'lack':210 'limit':149 'live':204 'lowpaymentfee.com':30,45 'make':213 'maxamountrequir':106 'micropay':7,20 'network':76 'no-api-key' 'offer':47 'on-chain':92 'openapi':178 'page':163 'paramet':195 'part':40 'pay':51 'pay-per-cal':50 'pay-per-call' 'payment':71,89,142 'per':12,25,52,119 'platform':44,124,145 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':84,197 'price':129,160 'prompt':170 'protocol':72 'pure':138 'rate':148 'readm':162 'render':165 'request':13,26,85,120,228 'request/response':181 'requir':134 'respons':191 'retriev':1,14 'return':31,87,222 'schema':179 'servic':65 'settl':91 'span':56 'spars':156 'specif':80 'structur':226 'substant':173 'uniform':126 'unit':110 'usdc':78,96,116 'usdc-base' 'use':77 'util':64 'via':5,18,95 'wallet':169 'x402':6,19,70,102,141 'x402 finance API' 'x402-payment'","prices":[{"id":"e3210a9c-6379-4993-aed8-613b0f99e59a","listingId":"d5626a50-b630-4903-914f-033169a0edb9","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/38/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":"2026-04-18T18:52:39.364Z"}],"sources":[{"listingId":"d5626a50-b630-4903-914f-033169a0edb9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/38/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.364Z","lastSeenAt":"2026-04-27T22:33:20.595Z"}],"details":{"listingId":"d5626a50-b630-4903-914f-033169a0edb9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/38/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38/holdings"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38/holdings"}],"useCases":["Fetching current holdings for a specific portfolio programmatically","Integrating portfolio data into dashboards or trading bots","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers who want keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Users who prefer on-chain 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 cost-prohibitive","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.636Z"},"updatedAt":"2026-04-27T22:33:20.595Z"}}