{"id":"dacf5e16-bdf6-4d9a-80e8-e79fb3178d93","shortId":"9Exxu7","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/portfolios/9` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific `/portfolios/9` resource is listed under \"Premium API Access\" and returns JSON via POST. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe x402 challenge advertises a `maxAmountRequired` of 20000 base units. USDC uses 6 decimals, so the cost per request is $0.02 (two cents), consistent with the site's uniform $0.02/request pricing across all endpoints. The platform emphasizes simplicity: no API keys, no rate limits, no commitments — just attach an x402 payment header to each call.\n\nNote that the `/portfolios/9` endpoint is not listed on the site's main landing page among the documented API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). Its exact response payload and purpose are unclear — the name \"Premium API Access\" is generic and no schema or example response is documented. The docs, pricing, and README pages all rendered as empty wallet-connect prompts, so no additional technical documentation was available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","premium API access","x402 portfolio","lowpaymentfee","USDC micropayment API","pay-per-call API","Base network API"],"warnings":["The /portfolios/9 endpoint is not listed among the site's documented APIs — its purpose and response format are unknown.","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, response schema, or example responses are available.","The generic name 'Premium API Access' provides no insight into what data is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, the specific /portfolios/9 resource is not documented on the site, no response schema or example is available, and all documentation pages rendered as empty wallet-connect stubs. The purpose and output of this endpoint remain 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'/portfolios/9':62,145 '/request':116 '0.02':106,115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20000':93 '6':98 'Base network API' 'USDC micropayment API' 'access':69,181 'across':118 'addit':208 'advertis':89 'ai':164 'ai/ml':53 'among':157 'analyt':52,163 'api':49,68,126,160,180 'attach':134 'avail':212 'base':7,20,80,94 'base-network' 'call':48,141 'categori':161 'cent':108 'challeng':88 'collect':40 'commit':132 'connect':204 'consist':109 'contract':84 'cost':102 'data':51,56,162 'decim':99 'doc':193 'document':159,191,210 'emphas':123 'empti':201 'endpoint':5,18,28,120,146 'exact':170 'exampl':188 'financ':166 'finance/web3':55 'gate':3,16 'generic':183 'header':138 'infer':54 'infrastructur':58,168 'json':72 'json-api' 'key':127 'land':155 'limit':130 'list':65,149 'lowpaymentfee' 'lowpaymentfee.com':35 'main':154 'maxamountrequir':91 'ml':165 'name':178 'network':81 'note':142 'offer':38 'page':156,197 'part':32 'pay':9,22,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request':8,21 'payload':172 'payment':75,137 'per':10,23,47,103 'platform':36,122 'portfolio':4,17 'portfolio API' 'portfolio-data' 'post':74 'premium':67,179 'premium API access' 'price':117,194 'prompt':205 'protocol':44 'purpos':174 'rate':129 'readm':196 'render':199 'request':11,24,104 'resourc':63 'respons':171,189 'return':71 'schema':186 'settl':77 'simplic':124 'site':112,152 'span':50 'specif':61 'technic':209 'two':107 'unclear':176 'uniform':114 'unit':95 'usdc':13,26,83,96 'usdc-settlement' 'use':82,97 'util':59 'via':73 'wallet':203 'wallet-connect':202 'web3':167 'x402':2,15,43,87,136 'x402 portfolio' 'x402-gated':1,14 'x402-payment' 'x402-protocol':42","prices":[{"id":"2dc8201b-9d9f-477e-b2e6-515d6ab19dc8","listingId":"dacf5e16-bdf6-4d9a-80e8-e79fb3178d93","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:43.471Z"}],"sources":[{"listingId":"dacf5e16-bdf6-4d9a-80e8-e79fb3178d93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:43.471Z","lastSeenAt":"2026-04-27T14:05:19.555Z"}],"details":{"listingId":"dacf5e16-bdf6-4d9a-80e8-e79fb3178d93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/9 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units on Base network using USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/9"},{"claim":"The site lists uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data via a single micropayment-gated API call","Integrating pay-per-request data access into autonomous agents","Accessing premium content without API key registration"],"bestFor":["Agents or services that need keyless, pay-per-call API access","Developers experimenting with x402 payment protocol on Base","Use cases requiring low-friction micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.541Z"},"updatedAt":"2026-04-27T14:05:19.555Z"}}