{"id":"5c986630-95ee-4b3d-bf99-87e72b932623","shortId":"4m9k6x","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 `/api/v1/portfolios/66` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/66` resource is listed under \"Premium API Access\" but its exact data payload is not documented in the available crawl material. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 exact-payment scheme. The probe confirmed a live 402 challenge with `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found; the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the actual response schema and the meaning of \"portfolios/66\" are undocumented, agents should treat this as a low-information endpoint. The platform appears to be a demonstration or early-stage x402 API marketplace. Use with caution until richer documentation is available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","premium data access","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and README pages only show 'Connect wallet' with no content","Response schema for /api/v1/portfolios/66 is completely undocumented; actual payload is unknown","The platform appears to be early-stage or a demo; reliability and data quality are unverified","The specific meaning of 'portfolios/66' (what portfolio, what data) is not described anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/66","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/66","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 402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example responses, and the purpose of '/portfolios/66' is unexplained. Docs pages are empty beyond a wallet-connect prompt. Effectively a stub 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'/portfolios/66':63 '0.02':10,24,89,142 '000':134 '0x8335':114 '20':133 '2913':115 '402':128 '6':139 'Base network API' 'USDC micropayment API' 'accept':152 'access':70,103 'actual':187 'advertis':86,148 'agent':197 'ai/ml':55 'analyt':54 'api':51,69,96,219 'appear':209 'application/json':157 'avail':81,228 'base':8,22,109,135 'caution':223 'challeng':129 'collect':42 'confirm':125 'connect':178 'consist':143 'content':184 'contract':113 'crawl':82 'data':5,19,53,74 'decim':140 'demonstr':213 'detail':161 'doc':169 'document':78,162,226 'earli':216 'early-stag':215 'endpoint':6,20,30,151,206 'equal':141 'exact':73,120 'exact-pay':119 'exampl':164 'finance/web3':57 'flat':88 'found':167 'gate':3,17 'infer':56 'inform':205 'infrastructur':59 'instant':102 'json-response' 'key':97 'limit':100 'list':66 'live':127 'low':204 'low-inform':203 'lowpaymentfee' 'lowpaymentfee.com':37 'marketplac':220 'materi':83 'maxamountrequir':131 'mean':192 'model':93 'network':110 'no-api-key' 'offer':40 'openapi':159 'page':173 'part':34 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payload':75 'payment':104,121 'per':11,25,49,90 'platform':38,85,208 'portfolio':4,18 'portfolio API' 'portfolio-data' 'portfolios/66':194 'post':153 'post-method' 'premium':68 'premium data access' 'price':92,149,170 'probe':124 'prompt':180 'protocol':46 'rate':99 'readm':172 'render':175 'request':12,26,50,91,154 'resourc':64 'respons':165,188 'return':156 'richer':225 'schema':160,189 'scheme':122 'settl':106 'site':146 'span':52 'specif':62 'stage':217 'substant':183 'treat':199 'undocu':196 'unit':136 'usdc':14,28,112 'usdc-base' 'use':111,221 'util':60 'via':116 'wallet':179 'x402':2,16,45,118,218 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"ca565e71-934d-420f-bb0e-cbe7daec3fe8","listingId":"5c986630-95ee-4b3d-bf99-87e72b932623","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:13.392Z"}],"sources":[{"listingId":"5c986630-95ee-4b3d-bf99-87e72b932623","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:13.392Z","lastSeenAt":"2026-04-27T20:08:58.549Z"}],"details":{"listingId":"5c986630-95ee-4b3d-bf99-87e72b932623","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/66 \\\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":"Flat $0.02 per request pricing with no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66"}],"useCases":["Fetching portfolio data behind a per-request USDC paywall","Demonstrating x402 payment protocol integration on Base","Agent-driven data retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base","Low-cost per-request data access without subscriptions"],"notFor":["Production use requiring documented response schemas","High-throughput bulk data retrieval where per-call cost adds up","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.993Z"},"updatedAt":"2026-04-27T20:08:58.549Z"}}