{"id":"c0be5a70-c0a3-41ca-a172-2ebb78158e99","shortId":"TkYtcb","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 returns portfolio performance data for a specific portfolio (ID 46) 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 data, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint falls under the finance category and appears to deliver portfolio performance metrics. 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/response schema is documented beyond the x402 challenge metadata, callers will need to experiment with POST body formats. The endpoint is confirmed live (402 challenge returned successfully). There are no API keys or rate limits advertised — access is purely pay-per-call via the x402 protocol.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No API documentation found — docs, pricing, and API pages all return only a 'Connect wallet' prompt with no content.","No request body schema or response schema documented; callers must guess the POST format.","Portfolio ID 46 is hardcoded in the URL; unclear if other portfolio IDs are accessible or how they are created.","The provider hosts many endpoints but none appear to have public documentation beyond the landing page catalog."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/46/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/46/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 402 challenge, but there is no OpenAPI schema, no documented request/response format, no example payloads, and the docs pages are empty. The listing is effectively a stub with only the x402 challenge metadata and the landing page catalog to work 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'0.02':10,23,76,108 '000':71 '0x8335':63 '20':70 '2913':64 '402':181 '46':40 '6':81 'accept':47 'access':194 'advertis':193 'ai/ml':98 'analyt':97 'api':94,143,188 'appear':120 'base':8,21,58,72 'behind':41 'beyond':162 'bodi':174 'broad':88 'call':200 'caller':167 'catalog':89 'categori':118 'challeng':165,182 'confirm':179 'connect':149 'content':155 'contract':62 'cost':68 'crawl':138 'data':3,16,34,96,101 'decim':82 'deliv':122 'detail':129 'doc':140 'document':130,161 'endpoint':28,46,113,177 'equal':75 'exampl':132 'experi':171 'fall':114 'financ':117 'finance/web3':100 'financial data API' 'format':175 'found':135 'gate':93 'host':86 'id':39 'infer':99 'infrastructur':103 'investment performance' 'json':52 'json-response' 'key':189 'limit':192 'live':180 'lowpaymentfee.com':30,85 'maximum':67 'metadata':166 'metric':125 'micropay':6,19 'need':169 'network':9,22,59 'openapi':127 'page':144 'particular':112 'pay':198 'pay-per-cal':197 'pay-per-request' 'payment':53 'paywal':44 'per':77,109,199 'perform':2,15,33,124 'portfolio':1,14,32,38,123 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48,173 'price':106,141 'prompt':151 'protocol':204 'provid':84 'pure':196 'rate':191 'request':49,78,110 'request/response':158 'respons':133 'return':31,51,146,183 'schema':128,159 'settl':55 'span':95 'specif':37 'substant':154 'success':184 'unit':73 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':104 'via':4,17,201 'wallet':150 'x402':5,18,43,92,164,203 'x402 finance endpoint' 'x402-gated':91 'x402-payment'","prices":[{"id":"c41ba8e7-bb84-4c1c-bb12-d6fb967394e4","listingId":"c0be5a70-c0a3-41ca-a172-2ebb78158e99","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/46/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":"2026-04-18T18:52:48.885Z"}],"sources":[{"listingId":"c0be5a70-c0a3-41ca-a172-2ebb78158e99","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/46/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:48.885Z","lastSeenAt":"2026-04-28T11:33:49.398Z"}],"details":{"listingId":"c0be5a70-c0a3-41ca-a172-2ebb78158e99","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/46/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/46/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/46/performance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Programmatic portfolio monitoring by AI agents with crypto wallets","Integrating portfolio performance data into dashboards or reports"],"bestFor":["Agents or apps that need on-demand portfolio performance data without API key management","Micropayment-based access to financial data on Base network","Developers experimenting with x402 pay-per-call APIs"],"notFor":["Users who need detailed API documentation or guaranteed schema stability","High-frequency bulk data retrieval where per-call pricing adds up","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.114Z"},"updatedAt":"2026-04-28T11:33:49.398Z"}}