{"id":"557272de-0c0c-4b56-9435-ed495674d351","shortId":"qRAzGY","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 provides access to a specific portfolio resource (`/api/v1/portfolios/65`) behind an x402 paywall. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific `/api/v1/portfolios/65` endpoint is listed as \"Premium API Access\" with a maximum payment of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nDocumentation beyond the landing page is extremely sparse — 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 description of what the portfolio resource actually contains or what parameters it accepts. The endpoint name \"portfolios/65\" suggests a specific portfolio record, but its contents and structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto payment API"],"warnings":["No OpenAPI or schema available — request parameters and response structure are completely unknown","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no content","The specific resource '/api/v1/portfolios/65' is not listed on the provider's landing page catalog — its purpose is unclear","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/65","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/65","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 via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the portfolio resource contains, and all doc pages render only a wallet-connect prompt. The listing is essentially a stub with verified liveness and pricing but no usable technical 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'0.02':9,26,76,128,131 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':161 '20':122 'Base network API' 'USDC micropayment API' 'accept':142,211 'access':40,116 'actual':205 'addit':186 'address':153 'ai/ml':66 'analyt':65 'api':15,32,62,88,115,172 'application/json':147 'attach':99 'base':7,24,85,124,160 'behind':47 'beyond':163 'broad':55 'call':61,133 'caller':97 'catalog':56 'challeng':136 'commit':94 'confirm':137 'connect':181 'contain':206 'content':223 'contract':158 'crypto payment API' 'data':64,69 'descript':199 'detail':188 'doc':171 'document':162 'endpoint':5,22,36,110,139,213 'extrem':168 'finance/web3':68 'gate':3,20 'header':103 'i.e':130 'infer':67 'infrastructur':71 'json-response' 'key':16,33,89 'land':165 'limit':91 'list':112 'live':141 'lowpaymentfee' 'lowpaymentfee.com':38 'maximum':119 'name':214 'network':86 'no-api-key' 'openapi':192 'oper':53 'page':166,176 'paramet':209 'pay':8,25,59 'pay-per-cal':58 'pay-per-call API' 'pay-per-request' 'payment':102,120,149 'paywal':50 'per':10,27,60,77,132 'portfolio':4,21,44,203,219 'portfolio API' 'portfolio-data' 'portfolios/65':215 'post':143 'premium':114 'premium API access' 'price':74,173 'prompt':183 'provid':39,52 'rate':90 'readm':175 'record':220 'render':178 'request':11,28,78,106,144 'request/response':195 'requir':17,34,96 'resourc':45,204 'return':146 'schema':196 'sent':151 'settl':80 'simpli':98 'span':63 'spars':169 'spec':193 'specif':43,108,218 'structur':225 'suggest':216 'technic':187 'unit':125 'unknown':227 'upfront':93 'usdc':13,30,82,127,129,157 'usdc-base' 'use':155 'util':72 'wallet':182 'x402':2,19,49,101,135 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"dd468eed-4f62-450e-a656-875f11e9161a","listingId":"557272de-0c0c-4b56-9435-ed495674d351","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:13.980Z"}],"sources":[{"listingId":"557272de-0c0c-4b56-9435-ed495674d351","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:13.980Z","lastSeenAt":"2026-04-27T20:08:58.582Z"}],"details":{"listingId":"557272de-0c0c-4b56-9435-ed495674d351","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/65 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65"},{"claim":"All 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Agent-driven data retrieval without pre-registration or API key management","Programmatic access to portfolio information settled on Base L2"],"bestFor":["Agents or services that need keyless, pay-as-you-go API access","Developers experimenting with x402 payment protocol integrations","Use cases requiring low-friction, per-call billing in stablecoins"],"notFor":["Users who need detailed documentation or well-defined schemas before integrating","High-volume consumers who prefer subscription or bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.918Z"},"updatedAt":"2026-04-27T20:08:58.582Z"}}