{"id":"c2edc537-f6df-4280-97eb-fd0212656d5e","shortId":"gLVFqM","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 #22 via a POST request, gated behind the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all priced at $0.02 per request and settled in USDC on Base. However, this specific listing covers only the `/api/v1/portfolios/22/holdings` route.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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 POST body (if any) is expected. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data contract is unknown.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-call","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","portfolio positions","asset allocation API","holdings data","x402 finance API"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","No request body schema or response schema provided; data contract is entirely unknown","The specific portfolio (ID 22) is hardcoded in the URL with no explanation of what it represents","Cannot verify whether the endpoint returns real, useful financial data or placeholder content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/22/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/22/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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The purpose of 'portfolio 22 holdings' is opaque — it is unclear whether this returns real financial data or demo/placeholder 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'0.02':11,24,50,74,129 '000':65 '20':64 '22':36 '402':204 '6':70 'actual':208 'advertis':60 'ai/ml':118 'analyt':117 'api':76,114,154 'asset allocation API' 'attach':85 'base':9,22,55,66,137 'behind':42 'bodi':191 'broader':103 'call':48,113 'caller':83 'challeng':59,205 'confirm':199 'connect':163 'contain':187 'content':169 'contract':210 'cost':49 'cover':142 'crawl':152 'data':4,17,33,116,122,209 'decim':71 'descript':180 'doc':153 'document':147 'dozen':108 'endpoint':28,98,197 'equal':73 'exampl':177 'expect':195 'extrem':149 'field':183 'finance/web3':120 'gate':41 'header':90 'hold':3,16,32,185 'holdings data' 'howev':138 'infer':119 'investment holdings' 'key':77 'limit':80 'list':141 'live':200 'lowpaymentfee.com':30,105 'market':121 'maxamountrequir':62 'micropay':7,20 'network':56 'no-api-key' 'offer':107 'openapi':173 'page':158 'part':100 'pay':111 'pay-per-cal':110 'pay-per-call' 'payment':45,89,95 'per':12,25,112,130 'platform':104 'portfolio':2,15,35 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':39,190 'price':127,155 'prompt':165 'proof':96 'proper':203 'protocol':46 'rate':79 'readm':157 'request':13,26,40,131 'request/response':176 'requir':82 'respons':186 'retriev':1,14 'return':31,160,201 'rout':146 'schema':174 'servic':125 'settl':133 'simpli':84 'span':115 'spars':150 'specif':140 'unit':67 'unknown':212 'usdc':52,69,135 'usdc-base' 'util':124 'valid':93 'via':5,18,37 'wallet':164 'x':88 'x-payment':87 'x402':6,19,44,58,94 'x402 finance API' 'x402-payment'","prices":[{"id":"56ed7ab2-e6fb-43c6-b845-5d60c7254b7a","listingId":"c2edc537-f6df-4280-97eb-fd0212656d5e","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/22/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":"2026-04-18T18:52:30.891Z"}],"sources":[{"listingId":"c2edc537-f6df-4280-97eb-fd0212656d5e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/22/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:30.891Z","lastSeenAt":"2026-04-28T16:10:29.212Z"}],"details":{"listingId":"c2edc537-f6df-4280-97eb-fd0212656d5e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/22/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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/22/holdings"},{"claim":"The platform advertises $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 contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/22/holdings"}],"useCases":["Fetching current holdings for a specific portfolio programmatically","Integrating portfolio position data into dashboards or trading bots","Automated portfolio monitoring with per-call micropayments"],"bestFor":["Developers who want keyless, pay-per-call access to portfolio data","Agents that need on-demand holdings lookups without subscription commitments","Web3-native applications settling API costs in USDC on Base"],"notFor":["Users needing detailed API documentation or guaranteed response schemas before integrating","High-frequency bulk data consumers who would prefer flat-rate pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.029Z"},"updatedAt":"2026-04-28T16:10:29.212Z"}}