{"id":"14cecd30-b1ac-4e18-ad02-877338a2f2f4","shortId":"JK5Jvm","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides access to a \"portfolios\" resource (specifically portfolio ID 5) behind an x402 payment wall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — access is granted purely via the x402 payment protocol.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (/api/v1/portfolios/5) is not explicitly described on the site's landing page among those categories, so its exact response payload and purpose are unclear.\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 spec, no example request/response documentation, and no schema beyond what the x402 challenge provides. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data the portfolio endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The /api/v1/portfolios/5 endpoint is not listed among the advertised APIs on the landing page; its purpose and response format are unknown.","No OpenAPI spec or response schema provided.","No example request or response data available to verify functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/5","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no example requests/responses, and the specific /portfolios/5 endpoint isn't even listed on the site's landing page. The response schema and purpose must be 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'/api/v1/portfolios/5':162 '/call':16,32 '/docs':190 '/pricing':192 '/readme':194 '0.02':15,31,83,152 '000':78 '0x8335':70 '20':77 '2913':71 '402':233 '5':46 '6':88 'Base network API' 'USDC micropayment API' 'accept':54 'access':38,98 'actual':250 'advertis':111 'ai/ml':123 'among':173 'amount':75 'analysi':126 'analyt':122 'api':91,119 'base':7,23,65,79 'behind':47 'beyond':219 'broader':108 'call':118 'categori':175 'challeng':223,234 'classif':128 'confirm':228 'connect':200 'content':206 'contract':69 'convers':145 'data':121,131,246 'decim':89 'describ':166 'difficult':242 'document':185,215,239 'embed':129 'endpoint':5,21,34,53,148,158,226,249 'equal':82 'estim':139 'exact':178 'exampl':213 'exchang':134 'explicit':165 'extrem':187 'feed':133 'finance/web3':130 'gas':138 'gate':3,19 'generat':146 'geocod':143 'grant':100 'howev':155 'id':45 'infer':124 'infrastructur':141 'json':59 'json-response' 'key':92 'know':244 'lack':237 'land':171 'limit':95 'list':150,160 'live':229 'lowpaymentfee' 'lowpaymentfee.com':36,109 'make':240 'maximum':74 'network':66 'no-api-key' 'openapi':210 'page':172,195 'pay':9,25,116 'pay-per-cal':115 'pay-per-call API' 'pay-per-request':8,24 'payload':180 'payment':50,60,105 'per':10,26,84,117,153 'platform':110 'portfolio':4,20,41,44,248 'portfolio API' 'portfolio-data' 'post':55 'price':132 'prompt':202 'proper':232 'protocol':106 'provid':37,224 'pure':101 'purpos':182 'quot':137 'rate':94,135 'render':197 'request':11,27,56,85,154 'request/response':214 'requir':97 'resourc':42 'respons':179 'return':58,230,251 'schema':218 'sentiment':125 'settl':62 'site':169 'span':120 'spars':188 'spec':211 'specif':43,157 'suit':113 'summar':127 'token':136 'unclear':184 'unit':80 'usdc':13,29,68,86 'usdc-base' 'use':67,87 'util':142 'valid':144 'via':102 'wall':51 'wallet':201 'x402':2,18,49,104,222 'x402 portfolio' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"a24ebf57-a970-4d56-8f01-6f212b883ee0","listingId":"14cecd30-b1ac-4e18-ad02-877338a2f2f4","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:55.426Z"}],"sources":[{"listingId":"14cecd30-b1ac-4e18-ad02-877338a2f2f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:55.426Z","lastSeenAt":"2026-04-27T22:33:21.170Z"}],"details":{"listingId":"14cecd30-b1ac-4e18-ad02-877338a2f2f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/5 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/5"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/5"},{"claim":"All listed APIs 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 advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go data access into autonomous agents","Accessing financial portfolio information without API key management"],"bestFor":["Agents that can settle x402 payments on Base with USDC","Developers wanting keyless, pay-per-request portfolio data access","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.846Z"},"updatedAt":"2026-04-27T22:33:21.170Z"}}