{"id":"c3b876aa-dfae-4bf8-b8c2-81295c6ad1b0","shortId":"kggHWT","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 49. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/49/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 (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet. No API keys, accounts, or rate limits are advertised — access is purely payment-gated.\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 additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data format of portfolio holdings is unknown and must be discovered by making a paid request.","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","USDC micropayment API","Base network API","portfolio data endpoint","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","No request or response schema is published; callers must discover the payload format by trial.","The endpoint is for a specific portfolio ID (49); it is unclear whether other portfolio IDs are available or how they are discovered.","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none have visible documentation — the entire site may be a demo or early-stage project."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/49/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/49/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, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned is completely 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'0.02':11,24,68,119 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':114 '402':199 '49':37 '6':123 'Base network API' 'USDC micropayment API' 'accept':85 'access':144 'account':138 'across':56 'actual':203 'addit':174 'address':130 'advertis':143 'ai/ml':59 'analyt':58 'api':54,136,160 'attach':100 'avail':190 'base':9,22,79,116,133 'beyond':151 'broader':43 'call':53 'caller':99 'categori':64 'challeng':200 'confirm':194 'connect':169 'contain':106 'data':4,17,33,57,204 'decim':124 'detail':176 'discov':214 'doc':159 'document':150,185 'dozen':48 'endpoint':28,55,83,192 'exampl':188 'extrem':156 'finance/web3':61 'format':205 'gate':149 'handl':93 'header':105 'hold':3,16,32,208 'i.e':118 'id':36 'infer':60 'infrastructur':63 'inlin':94 'investment holdings' 'json':90 'json-response' 'key':137 'land':153 'limit':141 'live':195 'lowpaymentfee' 'lowpaymentfee.com':30,45 'mainnet':134 'make':216 'micropay':7,20 'must':212 'network':80 'no-api-key' 'offer':47 'openapi':180 'page':154,164 'paid':218 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'payload':189 'payment':91,104,110,126,148 'payment-g':147 'per':12,25,52,69 'platform':44 'portfolio':2,15,35,207 'portfolio data endpoint' 'portfolio holdings API' 'portfolio-holdings' 'post':86 'price':66,161 'prompt':171 'proper':198 'protocol':98 'pure':146 'rate':140 'readm':163 'render':166 'request':13,26,70,87,219 'request/response':183 'retriev':1,14 'return':31,89,196 'schema':184 'sent':128 'settl':72 'sign':108 'sinc':120 'spars':157 'spec':181 'specif':82 'technic':175 'unit':117 'unknown':210 'usdc':76,109,121 'usdc-base' 'use':75,122 'via':5,18,73,95 'wallet':170 'x':103 'x-payment':102 'x402':6,19,74,97 'x402 finance API' 'x402-payment'","prices":[{"id":"a6692c64-2f0d-422c-825c-bccb050e50cf","listingId":"c3b876aa-dfae-4bf8-b8c2-81295c6ad1b0","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/49/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":"2026-04-18T18:52:50.659Z"}],"sources":[{"listingId":"c3b876aa-dfae-4bf8-b8c2-81295c6ad1b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/49/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:50.659Z","lastSeenAt":"2026-04-27T22:33:20.992Z"}],"details":{"listingId":"c3b876aa-dfae-4bf8-b8c2-81295c6ad1b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/49/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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/49/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/49/holdings"},{"claim":"All endpoints 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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving holdings data for a specific investment portfolio","Integrating portfolio position data into trading dashboards or analytics tools","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 request/response schemas before integrating","Bulk data retrieval where per-request pricing would be cost-prohibitive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.081Z"},"updatedAt":"2026-04-27T22:33:20.992Z"}}