{"id":"b50c173c-4de1-4432-b39b-150ea411712f","shortId":"uewrPB","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 60) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider site lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per call. This particular endpoint falls under the finance category and appears to deliver performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are entirely unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific portfolio (ID 60) is hardcoded in the URL with no explanation of what it represents","No information on error handling, response fields, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/60/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/60/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of 'portfolio 60 performance' is opaque — it is unclear what portfolio this refers to or what fields are 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'000':71 '0x8335':61 '20':70 '2913':62 '402':187 '6':75 '60':38 'accept':44 'access':134 'advertis':133 'ai/ml':93 'analyt':92 'api':89,127,150 'appear':115 'avail':178 'base':8,20,56,72 'behind':39 'bodi':193 'broad':83 'call':105 'catalog':84 'categori':113 'challeng':188 'confirm':182 'connect':158 'contract':60 'cost':65 'data':3,15,32,91 'decim':76 'defin':124 'deliv':117 'detail':165 'doc':148 'document':143 'endpoint':26,108,180 'exact':191 'exampl':176 'extrem':145 'fall':109 'financ':112 'finance/web3':95 'financial data API' 'format':194 'gate':88 'grant':136 'header':142 'host':81 'id':37 'infer':94 'infrastructur':97 'investment performance' 'json':50 'json-api' 'key':128 'limit':131 'live':183 'lowpaymentfee.com':28,80 'metric':119 'micropay':6,18 'micropayment' 'network':9,21,57 'no-api-key' 'openapi':169 'page':153 'particular':107 'payload':177 'payment':51,141 'paywal':42 'per':11,23,68,104 'perform':2,14,31,118 'portfolio':1,13,30,36,125 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'pre':123 'pre-defin':122 'price':100,149 'prompt':160 'proper':186 'provid':78 'pure':137 'rate':130 'readm':152 'render':155 'request':12,24,46,69,192 'request/response':172 'respond':48 'respons':196 'return':29,184 'schema':173 'settl':53 'site':79 'span':90 'spars':146 'spec':170 'specif':35 'structur':197 'technic':164 'uniform':101 'unit':73 'unknown':199 'usdc':59 'usdc-base-network' 'use':58 'util':98 'via':4,16,138 'wallet':159 'x402':5,17,41,87,140 'x402 finance endpoint' 'x402-gated':86 'x402-payment'","prices":[{"id":"0504c43a-9019-41b0-860e-db3474879366","listingId":"b50c173c-4de1-4432-b39b-150ea411712f","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/60/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":"2026-04-18T18:53:06.172Z"}],"sources":[{"listingId":"b50c173c-4de1-4432-b39b-150ea411712f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/60/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:06.172Z","lastSeenAt":"2026-04-28T07:34:41.681Z"}],"details":{"listingId":"b50c173c-4de1-4432-b39b-150ea411712f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/60/performance \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/performance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Paying per-request for financial data without subscription commitments"],"bestFor":["Agents or apps needing on-demand portfolio performance data","Developers wanting keyless, pay-per-call financial APIs","x402-compatible clients on the Base network"],"notFor":["Users needing detailed API documentation or schemas before integrating","Bulk historical portfolio data retrieval (no batch endpoint documented)","Non-crypto payment workflows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.259Z"},"updatedAt":"2026-04-28T07:34:41.681Z"}}