{"id":"e17ee4a2-e0d4-4e00-a361-97a63ddfa50e","shortId":"yNAfp5","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/portfolios/48` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/48` resource is listed under \"Premium API Access\" but its exact data payload is not documented in the available crawl material — it likely returns portfolio-related data (possibly financial or analytical) in JSON format.\n\nThe endpoint is live and responds with a standard x402 payment challenge. It accepts payment via the \"exact\" scheme on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/portfolios/48` endpoint actually returns. The POST method is specified in the outputSchema. Without documentation of the request body format or response structure, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","portfolio-data","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","premium data access","x402 API","USDC micropayment API","Base network API","pay-per-call portfolio","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format is unknown","The exact data returned by /api/v1/portfolios/48 is undocumented and must be inferred or discovered experimentally","The '/portfolios/48' path suggests a specific resource ID; it is unclear if other portfolio IDs exist or what they represent"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/48","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/48","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 the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no documentation of what this endpoint actually returns, no request/response schema, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific purpose of /portfolios/48 is 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'/portfolios/48':61,214 '/request':149 '0.02':10,24,139,148 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':122 '20':128 '300':162 '6':136 'Base network API' 'USDC micropayment API' 'accept':109 'access':68,176 'across':151 'actual':216 'address':158 'advertis':167 'ai/ml':53 'amount':125 'analyt':52,92 'api':49,67,169,184 'avail':79 'base':8,22,117,130 'bodi':231 'call':48 'caller':236 'challeng':107 'collect':40 'connect':193 'consist':142 'contact':242 'content':199 'contract':121 'crawl':80 'data':5,19,51,72,88 'decim':137 'descript':210 'doc':183 'document':76,178,227 'endpoint':6,20,30,97,153,215 'equal':138 'exact':71,113 'exampl':207 'experi':240 'extrem':180 'finance/web3':55 'financi':90 'format':95,232 'gate':3,17 'howev':177 'infer':54 'infrastructur':57 'instant':175 'json':94 'json-response' 'key':170 'like':83 'limit':173 'list':64 'live':99 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':81 'maximum':124 'method':220 'need':238 'network':118 'no-api-key' 'openapi':203 'outputschema':225 'page':188 'part':34 'pay':9,23,46 'pay-per-cal':45 'pay-per-call portfolio' 'pay-per-request' 'payload':73 'payment':106,110,154 'per':11,25,47,140 'platform':38,166 'portfolio':4,18,86 'portfolio API' 'portfolio-data' 'portfolio-rel':85 'possibl':89 'post':219 'premium':66 'premium data access' 'price':150,185 'prompt':195 'protocol':44 'provid':244 'rate':172 'readm':187 'relat':87 'render':190 'request':12,26,141,230 'request/response':206 'requir':126 'resourc':62 'respond':101 'respons':234 'return':84,217 'schema':204 'scheme':114 'second':163 'sent':156 'site':145 'span':50 'specif':60 'specifi':222 'standard':104 'structur':235 'substant':198 'thin':181 'timeout':164 'uniform':147 'unit':131 'usdc':14,28,120,133 'usdc-base' 'use':119 'util':58 'via':111 'wallet':194 'without':226 'x402':2,16,43,105 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"a5600167-0054-49c9-89df-3bb6182b1763","listingId":"e17ee4a2-e0d4-4e00-a361-97a63ddfa50e","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:54.237Z"}],"sources":[{"listingId":"e17ee4a2-e0d4-4e00-a361-97a63ddfa50e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:54.237Z","lastSeenAt":"2026-04-27T22:33:21.191Z"}],"details":{"listingId":"e17ee4a2-e0d4-4e00-a361-97a63ddfa50e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/48 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/48"},{"claim":"The platform advertises $0.02/request pricing 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/48"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go data access into autonomous agents on Base","Accessing premium financial or analytical data without subscription commitments"],"bestFor":["Agents or apps that need on-demand portfolio data with no subscription","Developers experimenting with x402 pay-per-call protocols on Base","Low-volume consumers who prefer per-request pricing over monthly plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.846Z"},"updatedAt":"2026-04-27T22:33:21.191Z"}}