{"id":"feb79961-ecc7-4fb7-9fe1-40bc86a07b12","shortId":"WVPFKN","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" at the path `/api/v1/portfolios/35`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/portfolios/35` endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, 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 documentation, and no description of what the \"portfolios/35\" resource actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific portfolio endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for this endpoint","The purpose and response format of /api/v1/portfolios/35 is completely undocumented","No agents.txt or robots.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/35","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/35","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the portfolios/35 resource actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/portfolios/35':38,78 '/docs':153 '/pricing':154 '/readme':157 '0.02':101 '000':105 '0x8335':92 '20':104 '2913':93 '300':137 '402':197 '6':109 'Base network API' 'USDC micropayment API' 'accept':80 'access':34,122 'actual':187 'advertis':113 'ai/ml':58 'analyt':57 'api':33,53,115 'attach':125 'avail':147 'base':7,20,74,95,106 'base-network' 'broader':44 'call':52,132 'challeng':198 'confirm':192 'connect':163 'content':169 'contract':91 'cost':99 'crypto payment API' 'data':56,61,206 'decim':110 'descript':181 'document':139,178,201 'dozen':47 'endpoint':5,18,28,54,79,148,190,212 'extrem':141 'finance/web3':60 'function':208 'gate':3,16,66 'header':129 'infer':59 'infrastructur':63 'instant':121 'json':85 'json-api' 'key':116 'land':144 'limit':119 'list':146 'live':193 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':98 'network':75 'offer':46 'openapi':173 'page':145,158 'part':41 'path':37 'pay':9,22,50 'pay-per-cal':49 'pay-per-call API' 'pay-per-request':8,21 'payment':70,86,128,134 'per':10,23,51,102 'platform':45,112 'portfolio':4,17,211 'portfolio API' 'portfolio-data' 'portfolios/35':185 'post':81 'premium':32 'price':150 'prompt':165 'proper':196 'protocol':71 'provid':31,213 'rate':118 'render':160 'request':11,24,82,103 'request/response':176 'resourc':186 'return':84,188,194 'schema':177 'second':138 'settl':88 'simpli':124 'span':55 'spars':142 'spec':174 'specif':77,210 'timeout':135 'unclear':204 'unit':107 'usdc':13,26,90 'usdc-settlement' 'util':64 'via':67 'wallet':164 'without':200 'x402':2,15,69,127 'x402 API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"5018b2f4-e1e5-41ba-a667-242adc1f5e9e","listingId":"feb79961-ecc7-4fb7-9fe1-40bc86a07b12","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:36.930Z"}],"sources":[{"listingId":"feb79961-ecc7-4fb7-9fe1-40bc86a07b12","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:36.930Z","lastSeenAt":"2026-04-28T03:05:37.631Z"}],"details":{"listingId":"feb79961-ecc7-4fb7-9fe1-40bc86a07b12","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/35 \\\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 x402Version 1, accepting USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/35"},{"claim":"The platform advertises $0.02/request pricing 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/35"}],"useCases":["Fetching portfolio data via a single micropayment without API key registration","Integrating pay-per-request portfolio access into an autonomous agent workflow","Accessing premium data endpoints using on-chain USDC payments on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.742Z"},"updatedAt":"2026-04-28T03:05:37.631Z"}}