{"id":"f042cffa-fe1f-4761-8d81-2c701c87d7f1","shortId":"usDWvQ","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at `/api/v1/portfolios/13` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/13` resource is listed under \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC on the Base network.\n\nThe x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required. The endpoint returns `application/json` responses.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/portfolios/13` resource actually returns. The endpoint name \"Premium API Access\" is generic and does not clarify the data served. Based on the site's category groupings (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), this portfolio endpoint likely returns some form of structured data, but its exact purpose cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","premium API access","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /portfolios/13","The endpoint name 'Premium API Access' is generic and does not describe the actual data returned","Cannot confirm what 'portfolios/13' represents — the resource purpose is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/13","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/13","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 what the /portfolios/13 resource actually returns. No OpenAPI schema, no request body specification, no response examples. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/portfolios/13':67,186 '/request':16,32,127 '0.02':15,31,115,126 '000':102 '0x8335':107 '20':101 '2913':108 '6':111 'Base network API' 'USDC micropayment API' 'accept':76 'access':74,195 'across':130 'actual':188 'advertis':97 'ai':214 'ai/ml':59 'analyt':58,213 'api':55,73,135,156,194 'application/json':148 'avail':237 'base':7,23,92,103,110,205 'call':11,27 'cannot':233 'categori':210 'challeng':84,96 'clarifi':201 'collect':46 'commit':143 'confirm':123,235 'connect':165 'content':171 'data':57,203,212,228 'decim':112 'descript':182 'doc':155 'document':150 'endpoint':5,21,34,132,146,191,221 'equal':114 'exact':231 'exampl':179 'extrem':152 'financ':216 'finance/web3':61 'flat':125 'form':225 'gate':3,19,79 'generic':197 'group':211 'infer':60 'infrastructur':63,218 'json-response' 'key':136 'land':121 'like':222 'limit':139 'list':70 'lowpaymentfee' 'lowpaymentfee.com':41 'materi':238 'maxamountrequir':99 'minimum':142 'ml':215 'model':129 'name':192 'network':93 'no-api-key' 'offer':44 'openapi':175 'page':122,160 'part':38 'pay':9,25,52 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request':51 'payment':83,85 'per':10,26,53,116 'platform':42,119 'portfolio':4,20,220 'portfolio API' 'post':77 'post-method' 'premium':72,193 'premium API access' 'price':128,157 'prompt':167 'protocol':50 'purpos':232 'rate':138 'readm':159 'render':162 'request':54,78,117 'request/response':178 'requir':144 'resourc':68,187 'respons':149 'return':147,189,223 'schema':176 'serv':204 'settl':87 'site':208 'span':56 'spars':153 'specif':66 'structur':227 'unit':104 'usdc':13,29,89,106 'usdc-base' 'util':64 'wallet':166 'web3':217 'x402':2,18,49,82,95 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':48","prices":[{"id":"1a3c55ce-9b0a-4839-9a7d-63998b09c48a","listingId":"f042cffa-fe1f-4761-8d81-2c701c87d7f1","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:20.648Z"}],"sources":[{"listingId":"f042cffa-fe1f-4761-8d81-2c701c87d7f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:20.648Z","lastSeenAt":"2026-04-28T05:34:35.184Z"}],"details":{"listingId":"f042cffa-fe1f-4761-8d81-2c701c87d7f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/13 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/13"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/13"},{"claim":"Platform pricing is $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing portfolio data via a single pay-per-request call without subscription or API key","Agent-driven workflows that need on-demand data retrieval with crypto micropayments","Integrating low-friction paid API calls settled on Base L2 in USDC"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.501Z"},"updatedAt":"2026-04-28T05:34:35.184Z"}}