{"id":"0ddfbc19-0ce9-49be-a2ef-71a003fb3067","shortId":"KENFJV","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 47) 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 pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility/infrastructure services — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. This particular endpoint sits under the finance category and appears to return performance metrics for a pre-defined portfolio. However, the exact response schema, accepted request body fields, and the nature of the portfolio (crypto, equities, etc.) are not documented in any available material.\n\nBecause the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, the specifics of what fields the endpoint accepts or returns remain unknown. The x402 challenge confirms the endpoint is live and correctly advertising its payment terms, but users should expect to experiment with the request body to discover accepted parameters.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-call","json-api"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance API"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' prompt with no content","Response schema and accepted request body fields are completely unknown","The specific portfolio (ID 47) is unexplained; unclear what asset class or data it covers","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/47/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/47/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no response examples, and no description of what the endpoint actually returns or accepts. The portfolio context (ID 47) is opaque. This is effectively a stub 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'0.02':10,23,76,110 '000':71 '0x8335':63 '20':70 '2913':64 '47':40 '6':81 'accept':47,149,196,227 'advertis':211 'ai/ml':99 'analyt':98 'api':95,115,175 'appear':133 'avail':167 'base':8,21,58,72 'behind':41 'bodi':151,224 'broad':88 'call':94 'catalog':89 'categori':131 'challeng':203 'commit':123 'confirm':204 'connect':182 'content':188 'contract':62 'correct':210 'cost':68 'crawl':171 'crypto':159 'data':3,16,34,97,103 'decim':82 'defin':142 'discov':226 'doc':174 'document':164,172 'endpoint':28,46,126,195,206 'equal':75 'equiti':160 'etc':161 'exact':146 'expect':218 'experi':220 'field':152,193 'financ':130 'finance/web3':101 'financial data API' 'host':86 'howev':144 'id':39 'infer':100 'investment performance' 'json':52 'json-api' 'key':116 'limit':119 'live':208 'lowpaymentfee.com':30,85 'market':102 'materi':168 'maximum':67 'metric':137 'micropay':6,19 'minimum':122 'natur':155 'network':9,22,59 'page':173 'paramet':228 'particular':125 'pay':92 'pay-per-cal':91 'pay-per-call' 'payment':53,213 'paywal':44 'per':77,93,111 'perform':2,15,33,136 'portfolio':1,14,32,38,143,158 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'pre':141 'pre-defin':140 'price':108,176 'prompt':184 'provid':31,84 'rate':118 'readm':177 'remain':199 'request':49,78,112,150,223 'respons':147 'return':51,135,179,198 'schema':148 'servic':106 'settl':55 'sit':127 'span':96 'specif':37,190 'substant':187 'term':214 'unit':73 'unknown':200 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'user':216 'utility/infrastructure':105 'via':4,17 'wallet':183 'x402':5,18,43,202 'x402 finance API' 'x402-payment'","prices":[{"id":"de660ae0-56c0-4922-a4bd-17a0d3149911","listingId":"0ddfbc19-0ce9-49be-a2ef-71a003fb3067","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/47/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":"2026-04-18T18:52:50.080Z"}],"sources":[{"listingId":"0ddfbc19-0ce9-49be-a2ef-71a003fb3067","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/47/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:50.080Z","lastSeenAt":"2026-04-27T22:33:21.020Z"}],"details":{"listingId":"0ddfbc19-0ce9-49be-a2ef-71a003fb3067","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/47/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a tracked 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 no signup","Developers wanting pay-per-call financial data on Base/USDC","Automated workflows that need frictionless, keyless API access"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","Bulk historical data retrieval (no evidence of batch or export support on this endpoint)","Non-crypto-native users who cannot settle payments on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.08Z"},"updatedAt":"2026-04-27T22:33:21.020Z"}}