{"id":"cbeb5d6e-3b34-4270-9639-fb24dc5599ae","shortId":"U6zFeA","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com exposes a portfolio resource (`/api/v1/portfolios/93`) behind an x402 payment challenge. It is part of a broader platform that offers data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utility endpoints, all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific `/api/v1/portfolios/93` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 exact-payment scheme: the caller includes an `X-PAYMENT` header containing a signed USDC transfer of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the provider's address on Base. No API keys, subscriptions, or rate limits are advertised — access is purely pay-per-call.\n\nDocumentation beyond the landing page is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the \"portfolios/93\" resource actually contains or what POST body it expects. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation the actual data returned and required input format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-data","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","USDC pay-per-call","lowpaymentfee","Base network API","crypto micropayment API","402 payment endpoint"],"warnings":["No OpenAPI or schema available — request body format and response structure are completely unknown.","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no technical content.","The specific resource '/api/v1/portfolios/93' is not listed on the provider's landing page; its purpose is unclear.","Cannot verify what data is actually returned without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the portfolios/93 resource returns, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed 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'0.02':9,26,71,122 '000':118 '20':117 '402':210 '402 payment endpoint' '6':126 'Base network API' 'USDC pay-per-call' 'accept':85 'access':144 'actual':194,216 'addit':175 'address':132 'advertis':143 'ai/ml':60 'analyt':59 'api':15,32,136,161 'application/json':90 'base':7,24,79,119,134 'behind':44 'beyond':152 'bodi':199 'broader':54 'call':150 'caller':102 'challeng':48,211 'confirm':205 'connect':170 'contain':109,195 'crypto micropayment API' 'data':58,63,217 'decim':127 'detail':177 'doc':160 'document':151,214 'endpoint':5,22,36,67,84,203 'exact':98 'exact-pay':97 'expect':201 'explan':188 'expos':39 'extrem':157 'finance/web3':62 'format':222 'gate':3,20 'handl':93 'header':108 'i.e':121 'includ':103 'infer':61 'infrastructur':65 'input':221 'json-api' 'key':16,33,137 'land':154 'limit':141 'live':206 'lowpaymentfee' 'lowpaymentfee.com':38 'network':80 'no-api-key' 'offer':57 'openapi':181 'page':155,165 'part':51 'pay':8,25,148 'pay-per-cal':147 'pay-per-request' 'payment':47,91,99,107 'per':10,27,72,149 'platform':55 'portfolio':4,21,41 'portfolio API' 'portfolio-data' 'portfolios/93':192 'post':86,198 'price':69,162 'prompt':172 'proper':209 'provid':130 'pure':146 'rate':140 'readm':164 'remain':223 'render':167 'request':11,28,73,87 'request/response':184 'requir':17,34,220 'resourc':42,193 'return':89,207,218 'schema':185 'scheme':100 'settl':74 'sign':111 'sinc':123 'spec':182 'specif':82 'subscript':138 'technic':176 'thin':158 'transfer':113 'unit':120 'unknown':224 'usdc':13,30,76,112,124 'usdc-base' 'use':125 'util':66 'via':94 'wallet':171 'without':213 'x':106 'x-payment':105 'x402':2,19,46,96 'x402 portfolio' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"55a0bb07-62a3-49ad-a7c1-dd43331a65d9","listingId":"cbeb5d6e-3b34-4270-9639-fb24dc5599ae","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:38.048Z"}],"sources":[{"listingId":"cbeb5d6e-3b34-4270-9639-fb24dc5599ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:38.048Z","lastSeenAt":"2026-04-27T14:05:19.359Z"}],"details":{"listingId":"cbeb5d6e-3b34-4270-9639-fb24dc5599ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/93 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/93"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/93"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-per-call financial data into autonomous agents","Accessing premium data without managing API keys or subscriptions"],"bestFor":["Agents or apps that can sign x402 USDC payments on Base","Developers wanting key-less, pay-as-you-go API access","Low-volume or sporadic consumers who prefer no subscription commitment"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.786Z"},"updatedAt":"2026-04-27T14:05:19.359Z"}}