{"id":"7ef9c9e2-3133-4c6f-bcda-10d86311e7b6","shortId":"dEFcKy","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com exposes a portfolio resource at `/api/v1/portfolios/11` behind an x402 payment wall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific `/api/v1/portfolios/11` endpoint accepts POST requests and returns JSON. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 explanation of what the \"portfolios/11\" resource actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is difficult to know what data to POST or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","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 all render only 'Connect wallet' with no content","No OpenAPI or schema definition found for this endpoint","Unknown request body format — no input schema documented","Unknown response format — no output schema or examples available","The specific resource 'portfolios/11' is not listed on the landing page; only analytics, AI, finance, and utility endpoints are advertised"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/11","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/11","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 with clear pricing, but there is zero documentation on request format, response schema, or what 'portfolios/11' actually provides. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/api/v1/portfolios/11':44,90 '/docs':170 '/pricing':171 '/readme':174 '0.02':9,26,78,118 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '0x8335':112 '20':106 '2913':113 '300':132 '402':210 '6':122 'Base network API' 'USDC micropayment API' 'accept':92 'account':139 'actual':204 'address':128 'advertis':101 'ai/ml':68 'amount':104 'analyt':67 'api':15,32,64,136 'attach':144 'avail':164 'base':7,24,86,108,115 'base-network' 'behind':45 'broader':55 'call':63 'caller':142 'challeng':100,211 'confirm':212 'connect':180 'content':186 'crypto payment API' 'data':66,71,222 'decim':123 'difficult':218 'document':156,195,215 'dozen':58 'endpoint':5,22,36,91,165,207 'equal':117 'expect':229 'explan':198 'expos':39 'extrem':158 'finance/web3':70 'gate':3,20 'given':119 'header':149 'infer':69 'infrastructur':73 'json':97 'json-response' 'key':16,33,137 'know':220 'land':161 'list':163 'live':209 'lowpaymentfee' 'lowpaymentfee.com':38 'max':103 'need':17,34 'network':87 'no-api-key' 'offer':57 'openapi':190 'page':162,175 'part':52 'pay':8,25,61 'pay-per-cal':60 'pay-per-call API' 'pay-per-request' 'payment':48,124,148,154 'per':10,27,62,79 'platform':56 'portfolio':4,21,41 'portfolio API' 'portfolio-data' 'portfolios/11':202 'post':93,224 'price':76,167 'prompt':182 'proof':155 'render':177 'request':11,28,80,94 'request/response':193 'requir':141 'resourc':42,203 'respons':227 'return':96,205 'schema':194 'second':133 'sent':126 'settl':81 'simpli':143 'span':65 'spars':159 'spec':191 'specif':89 'timeout':134 'unit':109 'usdc':13,30,83,111,120 'usdc-settlement' 'util':74 'valid':152 'wall':49 'wallet':181 'without':214 'x':147 'x-payment':146 'x402':2,19,47,99,153 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"379b042f-4dfd-4d79-94f8-df4e4c280bd8","listingId":"7ef9c9e2-3133-4c6f-bcda-10d86311e7b6","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:24.891Z"}],"sources":[{"listingId":"7ef9c9e2-3133-4c6f-bcda-10d86311e7b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:24.891Z","lastSeenAt":"2026-04-28T04:34:05.314Z"}],"details":{"listingId":"7ef9c9e2-3133-4c6f-bcda-10d86311e7b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11"}],"useCases":["Fetching portfolio data via a single micropayment without needing an API key","Agent-driven programmatic access to portfolio resources with on-chain USDC settlement","Integrating low-cost pay-per-request data endpoints into automated workflows"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.324Z"},"updatedAt":"2026-04-28T04:34:05.314Z"}}