{"id":"8db0a302-bc23-4905-883a-2fb643e723a8","shortId":"5cLPrn","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 48) 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 a maximum cost 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, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint falls under the finance category and appears to return performance metrics for a portfolio. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause no request or response schema is documented, the exact fields accepted or returned are unknown. The endpoint is confirmed live (HTTP 402 challenge captured) and uses x402 version 1 with the \"exact\" payment scheme. There are no API keys or rate limits advertised by the provider.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","finance API","x402 finance endpoint","crypto portfolio data"],"warnings":["No request or response schema documented — input/output fields are unknown","Docs, pricing, and API pages all return only 'Connect wallet' with no substantive content","Portfolio ID 48 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are discovered","No examples of actual response data found in crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/48/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/48/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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and no example data. The docs pages returned only wallet-connect prompts. This is effectively a stub listing with verified liveness but minimal usable 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'0.02':10,23,76,107 '000':71 '0x8335':63 '1':186 '20':70 '2913':64 '402':179 '48':40 '6':81 'accept':47,168 'advertis':200 'ai/ml':98 'analyt':97 'api':94,144,195 'appear':119 'base':8,21,58,72 'behind':41 'broad':88 'captur':181 'catalog':89 'categori':117 'challeng':180 'confirm':176 'connect':150 'content':156 'contract':62 'cost':68 'crawl':139 'crypto portfolio data' 'data':3,16,34,96 'decim':82 'detail':130 'doc':141 'document':131,164 'endpoint':28,46,112,174 'equal':75 'exact':166,189 'exampl':133 'fall':113 'field':167 'financ':116 'finance API' 'finance/web3':100 'found':136 'gate':93 'host':86 'http':178 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':196 'limit':199 'live':177 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':128 'page':145 'particular':111 'payment':53,190 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,126 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48 'price':105,142 'prompt':152 'provid':31,84,203 'rate':198 'request':49,78,109,159 'respons':134,161 'return':51,121,147,170 'schema':129,162 'scheme':191 'settl':55 'span':95 'specif':37 'substant':155 'unit':73 'unknown':172 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80,183 'util':103 'version':185 'via':4,17 'wallet':151 'x402':5,18,43,92,184 'x402 finance endpoint' 'x402-gated':91 'x402-payment'","prices":[{"id":"2f41de3b-5b73-4b6e-817a-b2a41cee74d6","listingId":"8db0a302-bc23-4905-883a-2fb643e723a8","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/48/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":"2026-04-18T18:52:50.660Z"}],"sources":[{"listingId":"8db0a302-bc23-4905-883a-2fb643e723a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/48/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:50.660Z","lastSeenAt":"2026-04-28T11:33:49.514Z"}],"details":{"listingId":"8db0a302-bc23-4905-883a-2fb643e723a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/48/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 HTTP 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/48/performance"},{"claim":"Payment is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/48/performance"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider hosts APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve performance metrics for a tracked portfolio","Integrate 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 micropayments","Developers who want keyless, pay-per-call finance APIs on Base","Automated portfolio monitoring workflows"],"notFor":["Users needing detailed API documentation or response schemas before integrating","Bulk historical portfolio data downloads (no evidence of batch support)","Non-crypto-native users unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.056Z"},"updatedAt":"2026-04-28T11:33:49.514Z"}}