{"id":"178eb2fa-c8a1-4cb7-b4a6-95fd5fa2e58b","shortId":"YdSWVr","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 `/api/v1/portfolios/51` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/51` resource is listed under \"Premium API Access\" but its exact data payload is not documented beyond the generic description.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" payment scheme. The response MIME type is `application/json` and the method is POST. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The landing page lists many endpoints at $0.02 each across categories (analytics, AI, finance, utilities), but 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, and no usage examples available. The actual data returned by `/api/v1/portfolios/51` is unknown from the available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","premium data access","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The actual data returned by /api/v1/portfolios/51 is completely undocumented","Cannot verify what 'Premium API Access' actually provides beyond a JSON response"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/51","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/51","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 returns a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and no explanation of what data the /portfolios/51 resource actually returns. The docs pages render only a wallet-connect prompt. This is effectively a stub 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'/portfolios/51':67 '0.02':9,26,116,179 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x8335':108 '20':102 '2913':109 '402':98 '6':121 'Base network API' 'USDC micropayment API' 'access':74 'across':181 'actual':220 'address':127 'ai':184 'ai/ml':59 'analyt':58,183 'api':15,32,55,73,146,191 'application/json':139 'attach':156 'avail':218,229 'base':7,24,104,112 'beyond':83 'caller':154 'categori':182 'challeng':96 'collect':46 'connect':199 'content':205 'data':57,78,221 'decim':122 'descript':86 'doc':189 'document':82,168 'endpoint':5,22,36,88,177 'equal':115 'exact':77,131 'exampl':217 'extrem':170 'financ':185 'finance/web3':61 'gate':3,20 'generic':85 'header':161 'http':97 'infer':60 'infrastructur':63 'json-api' 'key':16,33,147 'land':173 'limit':149 'list':70,175 'live':90 'lowpaymentfee' 'lowpaymentfee.com':43 'mani':176 'materi':230 'method':142 'mime':136 'network':113 'no-api-key' 'openapi':209 'page':174,194 'part':40 'pay':8,25,52 'pay-per-call API' 'pay-per-request':51 'payload':79 'payment':100,123,132,160,166 'per':10,27,53,117 'platform':44 'portfolio':4,21 'portfolio API' 'portfolio-data' 'post':144 'premium':72 'premium data access' 'price':190 'prompt':201 'proof':167 'protocol':50 'rate':148 'readm':193 'render':196 'request':11,28,54,99,118 'request/response':212 'requir':17,34,153 'resourc':68 'respons':135 'return':92,222 'schema':213 'scheme':133 'sent':125 'simpli':155 'span':56 'spars':171 'spec':210 'specif':66 'subscript':151 'type':137 'unit':105 'unknown':226 'usag':216 'usdc':13,30,107,119 'usdc-base' 'use':120,129 'util':64,186 'valid':94,164 'wallet':200 'x':159 'x-payment':158 'x402':2,19,49,95,165 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"50b5e43e-354f-4fcd-9e90-9ffc40a0c1b5","listingId":"178eb2fa-c8a1-4cb7-b4a6-95fd5fa2e58b","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:56.651Z"}],"sources":[{"listingId":"178eb2fa-c8a1-4cb7-b4a6-95fd5fa2e58b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:56.651Z","lastSeenAt":"2026-04-27T22:33:21.404Z"}],"details":{"listingId":"178eb2fa-c8a1-4cb7-b4a6-95fd5fa2e58b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/51 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/51"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing portfolio data via a single paid API call without needing an account or API key","Integrating pay-per-request data endpoints into autonomous agent workflows","Programmatic retrieval of portfolio information settled on-chain via USDC on Base"],"bestFor":["Agents or scripts that need keyless, on-demand API access with crypto micropayments","Developers experimenting with x402-protocol pay-per-request patterns","Use cases where avoiding subscription commitments and rate limits is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.726Z"},"updatedAt":"2026-04-27T22:33:21.404Z"}}