{"id":"8189c589-76ff-41d0-9737-0becb11f5abd","shortId":"gC2PmZ","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 7) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme micropayment of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint falls under the finance category and appears to return performance metrics for a portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no description of request parameters, and no sample response structure available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual payload format and response fields are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","micropayment","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","x402 finance API","micropayment portfolio data"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt","No request body schema or response schema documented; input/output formats are unknown","Portfolio ID 7 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are discovered","Provider appears to be a generic x402 demo site with many endpoints; actual data quality and reliability are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/7/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/7/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 schema, no request/response documentation, no examples, and the crawled pages are essentially empty beyond the landing page catalog. The purpose of this specific endpoint (portfolio 7 performance) is only inferable from the URL 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'0.02':10,23,78,110 '000':73 '0x8335':63 '20':72 '2913':64 '402':195 '6':83 '7':40 'accept':47 'access':138 'actual':199 'addit':168 'advertis':137 'ai/ml':100 'analyt':99 'api':96,131,154 'appear':122 'avail':186 'base':8,21,58,74 'behind':41 'broad':90 'call':112 'catalog':91 'categori':120 'challeng':196 'confirm':190 'connect':163 'contract':62 'crawl':152 'data':3,16,34,98,103 'decim':84 'descript':177 'detail':170 'doc':153 'document':147 'endpoint':28,46,115,188 'equal':77 'exact':68 'exact-schem':67 'extrem':149 'fall':116 'field':204 'financ':119 'finance/web3':102 'format':201 'gate':95 'grant':140 'host':88 'id':39 'infer':101 'infrastructur':105 'investment performance' 'json':52 'json-api' 'key':132 'limit':135 'live':191 'lowpaymentfee.com':30,87 'metric':126 'micropay':6,19,70 'micropayment' 'micropayment portfolio data' 'network':9,22,59 'no-api-key' 'openapi':174 'page':158 'paramet':180 'particular':114 'payload':200 'payment':53,145 'paywal':44 'per':79,111 'perform':2,15,33,125 'portfolio':1,14,32,38,129 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48 'price':108,155 'prompt':165 'proper':194 'protocol':146 'provid':31,86 'pure':141 'rate':134 'readm':157 'request':49,80,179 'respons':184,203 'return':51,124,160,192 'sampl':183 'schema':175 'scheme':69 'settl':55 'span':97 'spars':150 'specif':37 'structur':185 'technic':169 'unit':75 'unknown':206 'usdc':13,26,61,81 'usdc-base-network' 'use':60,82 'util':106 'via':4,17 'wallet':164 'x402':5,18,43,94,144 'x402 finance API' 'x402-gated':93 'x402-payment'","prices":[{"id":"1f83ea24-b2bf-4e28-91eb-05e4bd7fc554","listingId":"8189c589-76ff-41d0-9737-0becb11f5abd","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/7/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":"2026-04-18T18:53:18.830Z"}],"sources":[{"listingId":"8189c589-76ff-41d0-9737-0becb11f5abd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/7/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:18.830Z","lastSeenAt":"2026-04-27T18:36:24.704Z"}],"details":{"listingId":"8189c589-76ff-41d0-9737-0becb11f5abd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/7/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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/7/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/7/performance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units (= $0.02 with 6 decimal USDC)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/7/performance"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Integrating portfolio performance data into dashboards or agents","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with per-call payment","Developers who want keyless API access settled via Base USDC","Low-volume consumers who prefer pay-per-use over subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLA before integrating","High-frequency consumers who need bulk/subscription pricing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.658Z"},"updatedAt":"2026-04-27T18:36:24.704Z"}}