{"id":"f17fd65e-fd59-400b-bfd6-d2f97311764a","shortId":"xqdGaH","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 41) as JSON. It is part of a broader platform offering data, analytics, AI, finance, and utility APIs, all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment settles on-chain to a specified address on Base. The platform advertises no API keys, no rate limits, and instant access — you pay per call with no subscription or commitment.\n\nDocumentation is extremely sparse. The landing page lists many endpoints across categories (analytics, AI/ML, finance/Web3, infrastructure) all at the same $0.02 price point, but no detailed schema, request parameters, or response examples are provided for any of them. The /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The specific portfolio performance endpoint is not listed on the homepage, suggesting it may be an unlisted or specialized route. Without documentation on request body format or response structure, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","micropayment","json-api","per-request-billing"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","pay-per-call portfolio data","Base USDC API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet connect prompt with no content","No request body schema or response schema documented; callers must guess or reverse-engineer","This specific endpoint (/portfolios/41/performance) is not listed on the provider's homepage among advertised APIs","The platform lists many diverse endpoints (AI, analytics, finance, utilities) all at $0.02 — unclear whether all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/41/performance","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/41/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request parameters, response schema, or what 'portfolio 41 performance' actually returns. The docs pages are empty. This is effectively a stub 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'/docs':173 '/pricing':174 '/readme':177 '0.02':10,22,92,154 '000':94 '20':93 '41':38 '6':100 'Base USDC API' 'accept':71 'access':124 'across':144 'address':110 'advertis':115 'ai':51 'ai/ml':147 'analyt':50,146 'api':55,117 'base':8,20,65,95,112 'behind':58 'bodi':214 'broader':46 'call':128 'caller':219 'categori':145 'chain':106 'commit':133 'connect':183 'contact':225 'contain':81 'content':189 'data':3,15,32,49 'decim':101 'detail':159 'document':134,211 'endpoint':26,70,143,194 'exampl':165 'experi':223 'extrem':136 'financ':52 'finance/web3':148 'format':215 'gate':57 'header':80 'homepag':200 'id':37 'infrastructur':149 'instant':123 'investment performance' 'json':40 'json-api' 'key':118 'land':139 'limit':121 'list':141,197 'lowpaymentfee.com':28 'mani':142 'may':203 'micropay':6,18 'micropayment' 'need':221 'network':9,21,66 'offer':48 'on-chain':104 'page':140,178 'paramet':162 'part':43 'pay':126 'pay-per-call portfolio data' 'payment':61,79,85,102 'per':11,23,89,127 'per-request-billing' 'perform':2,14,31,193 'platform':47,114 'point':156 'portfolio':1,13,30,36,192 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':72 'price':88,155 'prompt':185 'proof':86 'protocol':62 'provid':167,227 'rate':120 'request':12,24,73,90,161,213 'requir':75 'respons':164,217 'return':29,180 'rout':209 'schema':160 'settl':103 'spars':137 'special':208 'specif':35,191 'specifi':109 'structur':218 'subscript':131 'substant':188 'suggest':201 'unit':96 'unlist':206 'usdc':68,98 'usdc-base' 'use':67 'util':54 'valid':83 'via':4,16 'wallet':184 'without':210 'x':78 'x-payment':77 'x402':5,17,60,84 'x402 finance API' 'x402-payment'","prices":[{"id":"55fe001d-83e1-4099-9f67-6694806c5d3e","listingId":"f17fd65e-fd59-400b-bfd6-d2f97311764a","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/41/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:49.464Z"}],"sources":[{"listingId":"f17fd65e-fd59-400b-bfd6-d2f97311764a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/41/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:49.464Z","lastSeenAt":"2026-04-27T22:33:21.015Z"}],"details":{"listingId":"f17fd65e-fd59-400b-bfd6-d2f97311764a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/41/performance \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/41/performance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC, 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/41/performance"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio analytics into agent workflows with per-call payment","Accessing financial data without API key registration"],"bestFor":["Agents needing on-demand portfolio performance data with no signup","Developers prototyping x402 payment flows against a live endpoint","Users who want pay-per-use financial data without subscriptions"],"notFor":["Users needing detailed API documentation or response schema before integrating","High-volume consumers who need bulk pricing or rate-limited guarantees","Anyone requiring historical portfolio data across many portfolio IDs (only ID 41 is known)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.081Z"},"updatedAt":"2026-04-27T22:33:21.015Z"}}