{"id":"d4ae6dc1-dbce-4307-943d-fd739424dabd","shortId":"8pRexM","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/portfolios/77` 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, and infrastructure utilities. The specific `/portfolios/77` resource is listed under \"Premium API Access\" but its exact functionality is not documented in the available crawl material — it does not appear on the site's main API listing page, which focuses on analytics, AI, finance, and utility endpoints.\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract `0x8335...2913`). The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each POST request.\n\nBecause the `/portfolios/77` endpoint is not described on the landing page or in any crawled documentation, its input schema and response format are unknown. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Treat this as a stub listing until the provider publishes documentation for this specific resource.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","premium API access","lowpaymentfee","x402 API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The /api/v1/portfolios/77 endpoint is not listed on the provider's main API catalog page — its purpose is unclear.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No input or output schema is available for this endpoint; request format must be guessed or discovered experimentally.","The provider site lists many endpoints but none under a 'portfolios' category — this may be a test or unlisted resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/77","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/77","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, but the specific /portfolios/77 resource has no documentation, no input/output schema, and does not appear on the provider's own API listing. Docs pages returned only 'Connect wallet' with no content. This is effectively a 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'/portfolios/77':63,175 '/request':148 '0.02':138,147 '000':130 '0x8335':124 '20':129 '2913':125 '6':135 'Base network API' 'USDC micropayment API' 'access':70,161 'advertis':152 'ai':99 'ai/ml':55 'analyt':54,98 'api':5,19,51,69,92,154 'appear':86 'attach':164 'avail':80 'base':8,22,119,131 'base-network' 'call':50 'caller':162 'challeng':113 'collect':42 'connect':207 'consist':141 'content':213 'contract':123 'crawl':81,187 'data':53 'decim':136 'describ':179 'doc':198 'document':77,188,224 'endpoint':6,20,30,103,105,176 'equal':137 'exact':73 'financ':100 'finance/web3':57 'focus':96 'format':194 'function':74 'gate':3,17 'header':168 'infer':56 'infrastructur':59 'input':190 'instant':160 'json-response' 'key':155 'land':182 'limit':158 'list':66,93,219 'live':107 'lowpaymentfee' 'lowpaymentfee.com':37 'main':91 'materi':82 'maxamountrequir':127 'network':120 'offer':40 'page':94,183,202 'part':34 'pay':10,24,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request':9,23 'payment':114,167 'per':11,25,49,139 'platform':38,144,151 'portfolio API' 'post':171 'post-endpoint' 'premium':4,18,68 'premium API access' 'price':149,199 'prompt':209 'protocol':46 'provid':222 'publish':223 'rate':157 'readm':201 'request':12,26,140,172 'resourc':64,228 'respons':193 'return':109,204 'schema':191 'settl':116 'simpli':163 'site':89 'span':52 'specif':62,227 'stub':218 'substant':212 'treat':214 'uniform':146 'unit':132 'unknown':196 'usdc':14,28,122 'usdc-settlement' 'use':121 'util':60,102 'valid':111 'wallet':208 'x402':2,16,45,112,166 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"209764a6-060e-42a1-9b2d-1eb09c5884aa","listingId":"d4ae6dc1-dbce-4307-943d-fd739424dabd","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:33.860Z"}],"sources":[{"listingId":"d4ae6dc1-dbce-4307-943d-fd739424dabd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:33.860Z","lastSeenAt":"2026-04-27T15:34:26.266Z"}],"details":{"listingId":"d4ae6dc1-dbce-4307-943d-fd739424dabd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/77 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/portfolios/77"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/77"}],"useCases":["Accessing a premium portfolio data resource via a single micropayment","Integrating pay-per-request API calls into agent workflows without API keys","Settling API access costs on-chain via USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","Agent systems that can handle x402 payment challenges natively","Users who prefer on-chain USDC micropayments over subscriptions"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume batch consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.006Z"},"updatedAt":"2026-04-27T15:34:26.266Z"}}