{"id":"9ec1e15b-60ef-4f1a-88cf-164f3f30ce0d","shortId":"h8SQWp","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 71. 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 priced at $0.02 per request and settled via x402 micropayments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/71/holdings` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the payee address on Base. No API keys, accounts, or rate limits are advertised — access is purely payment-gated.\n\nDocumentation beyond the landing page is extremely thin. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned after payment and the expected POST body structure are unknown.","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","crypto micropayment API","Base USDC API","lowpaymentfee","portfolio data endpoint"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The meaning of 'portfolio 71' and the structure of the holdings response are completely unknown","No information on what POST body (if any) is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/71/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/71/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 no documentation, no request/response schema, no examples, and no explanation of what 'portfolio 71 holdings' actually contains. The listing is effectively a stub with only pricing and protocol details 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'0.02':11,24,69,120 '000':117 '20':116 '402':195 '6':124 '71':37 'Base USDC API' 'accept':87 'access':141 'account':135 'actual':199 'addit':171 'address':129 'advertis':140 'ai/ml':59 'analyt':58 'api':54,133,158 'attach':102 'avail':186 'base':9,22,81,118,131 'beyond':148 'bodi':208 'broader':43 'call':53 'caller':101 'challeng':196 'confirm':190 'connect':166 'contain':108 'crypto micropayment API' 'data':4,17,33,57,62,200 'decim':125 'detail':173 'doc':156 'document':147 'dozen':48 'endpoint':28,55,85,188 'exampl':184 'expect':206 'extrem':153 'finance/web3':61 'gate':146 'handl':95 'header':107 'hold':3,16,32 'id':36 'infer':60 'inlin':96 'investment holdings' 'json':92 'json-response' 'key':134 'land':150 'limit':138 'live':191 'lowpaymentfee' 'lowpaymentfee.com':30,45 'micropay':7,20,76 'network':82 'no-api-key' 'offer':47 'openapi':177 'page':151,161 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'paye':128 'payload':185 'payment':93,106,112,145,203 'payment-g':144 'per':12,25,52,70 'platform':44 'portfolio':2,15,35 'portfolio data endpoint' 'portfolio holdings API' 'portfolio-holdings' 'post':88,207 'price':67,157 'prompt':168 'proper':194 'protocol':100 'pure':143 'rate':137 'readm':160 'render':163 'request':13,26,71,89 'request/response':180 'retriev':1,14 'return':31,91,192,201 'schema':181 'servic':65 'settl':73 'sign':110 'sinc':121 'span':56 'spec':178 'specif':84 'structur':209 'technic':172 'thin':154 'unit':119 'unknown':211 'usdc':78,111,122 'usdc-base' 'use':123 'util':64 'via':5,18,74,97 'wallet':167 'x':105 'x-payment':104 'x402':6,19,75,99 'x402 finance API' 'x402-payment'","prices":[{"id":"0f30113c-0871-43e9-bbdc-679bc634ff21","listingId":"9ec1e15b-60ef-4f1a-88cf-164f3f30ce0d","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/71/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":"2026-04-18T18:53:21.815Z"}],"sources":[{"listingId":"9ec1e15b-60ef-4f1a-88cf-164f3f30ce0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/71/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:21.815Z","lastSeenAt":"2026-04-27T17:05:04.904Z"}],"details":{"listingId":"9ec1e15b-60ef-4f1a-88cf-164f3f30ce0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/71/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/71/holdings"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base (6 decimals), so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio data into automated trading or analytics pipelines","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Users who prefer no-subscription, usage-based pricing"],"notFor":["Users needing 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 USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.575Z"},"updatedAt":"2026-04-27T17:05:04.904Z"}}