{"id":"fb1f88b4-9c47-4904-9c24-5b0289c0d7ab","shortId":"hxQx5D","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 lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 22) behind an x402 paywall. The provider operates a broad suite 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 subscriptions are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/portfolios/22` is listed under \"Premium API Access\" and accepts HTTP POST. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no description of what the portfolio resource actually contains or what POST body it expects. The endpoint is confirmed live via the 402 challenge, but without documentation it is difficult to know what data is returned or what input parameters are accepted.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-data","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response bodies","Unknown what data the /api/v1/portfolios/22 endpoint returns or what POST body it expects","The 'portfolios' category is not listed on the provider's homepage; it may be a test or unlisted resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/22","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/22","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no indication of what data the portfolio endpoint actually returns. This is effectively a stub 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'0.02':10,24,72,139 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':133 '20':127 '22':42 '2913':134 '300':153 '402':216 '6':143 'Base network API' 'USDC micropayment API' 'accept':113,235 'access':34,111 'actual':201 'address':149 'ai/ml':62 'analyt':61 'api':58,84,110,169 'application/json':161 'attach':94 'base':8,22,81,129,136 'base-network' 'behind':43 'bodi':206 'broad':51 'call':57 'caller':92 'challeng':118,217 'confirm':119,212 'connect':177 'contain':202 'content':183 'crypto-paid API' 'data':5,19,60,65,227 'decim':144 'descript':195 'difficult':223 'doc':167 'document':162,192,220 'endpoint':6,20,30,104,210 'equal':138 'expect':208 'extrem':164 'finance/web3':64 'gate':3,17 'given':140 'header':98 'http':114 'id':41 'infer':63 'infrastructur':67 'input':232 'json-response' 'key':85 'know':225 'limit':87 'list':107 'live':122,213 'lowpaymentfee' 'lowpaymentfee.com':32 'made':147 'maximum':125 'mime':158 'network':82 'no-api-key' 'openapi':187 'oper':49 'page':172 'paramet':233 'pay':9,23,55 'pay-per-cal':54 'pay-per-call API' 'pay-per-request' 'payment':97,145 'paywal':46 'per':11,25,56,73 'portfolio':4,18,38,40,199 'portfolio API' 'portfolio-data' 'post':115,205 'premium':109 'premium API access' 'price':70,168 'prompt':179 'provid':33,48 'rate':86 'readm':171 'render':174 'request':12,26,74,101,123 'request/response':190 'requir':91 'resourc':39,200 'respons':157 'return':229 'schema':191 'second':154 'settl':76 'simpli':93 'span':59 'spars':165 'spec':188 'specif':37,103 'subscript':89 'suit':52 'timeout':155 'type':159 'unit':130 'usdc':14,28,78,132,141 'usdc-settlement' 'util':68 'via':214 'wallet':178 'without':219 'x402':2,16,45,96,117 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e4ffa380-30d0-4270-8c71-be58ad071a04","listingId":"fb1f88b4-9c47-4904-9c24-5b0289c0d7ab","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:36.329Z"}],"sources":[{"listingId":"fb1f88b4-9c47-4904-9c24-5b0289c0d7ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:36.329Z","lastSeenAt":"2026-04-28T03:33:43.646Z"}],"details":{"listingId":"fb1f88b4-9c47-4904-9c24-5b0289c0d7ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/22 \\\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 requesting 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/22"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data for portfolio ID 22 via a single paid API call","Integrating pay-per-request data access into autonomous agent workflows","Accessing financial or portfolio information without subscription or API key management"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call data access","x402-compatible clients on the Base network","Use cases requiring no rate limits or API key overhead"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Bulk or high-volume consumers who would benefit from subscription pricing","Anyone not set up to make USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.786Z"},"updatedAt":"2026-04-28T03:33:43.646Z"}}