{"id":"16e0a877-0246-42bb-9412-e7c7de0a4925","shortId":"a6Vn8x","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 28) 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 market data, and utility/infrastructure services — all priced at $0.02 per request. The specific endpoint `/api/v1/portfolios/28/performance` is not listed on the provider's landing page catalog, but it is live and returns a valid x402 challenge. No API keys or rate limits are advertised; access is instant upon payment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint is confirmed live (402 challenge captured), but the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","fund performance API","portfolio tracking","x402 finance API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or response schema provided; the structure of the response after payment is unknown","This specific endpoint (/api/v1/portfolios/28/performance) is not listed in the provider's public API catalog","Cannot verify what data is actually returned after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/28/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/28/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, and no description of the data returned. The specific portfolio endpoint isn't even listed in the provider's own catalog. Score reflects a confirmed-live but undocumented 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'/request':11,24 '0.02':10,23,76,109 '000':71 '0x8335':63 '20':70 '28':40 '2913':64 '402':195 '6':81 'accept':47 'access':144 'actual':200 'advertis':143 'ai/ml':98 'analyt':97 'api':94,137,155 'base':8,21,58,72 'behind':41 'broad':88 'captur':197 'catalog':89,125 'challeng':135,196 'confirm':193 'connect':164 'contain':189 'content':170 'contract':62 'cost':68 'data':3,16,34,96,102,201 'decim':82 'descript':181 'doc':154 'document':149 'endpoint':28,46,114,191 'equal':75 'exampl':178 'extrem':151 'field':184 'finance/web3':100 'fund performance API' 'gate':93 'host':86 'id':39 'infer':99 'instant':146 'investment performance' 'json':52 'json-api' 'key':138 'land':123 'limit':141 'list':118 'live':129,194 'lowpaymentfee.com':30,85 'market':101 'maximum':67 'micropay':6,19 'micropayment' 'network':9,22,59 'openapi':174 'page':124,159 'pay-per-request' 'payment':53,148,204 'paywal':44 'per':77,110 'perform':2,15,33,187 'portfolio':1,14,32,38,186 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'price':107,156 'prompt':166 'provid':31,84,121 'rate':140 'readm':158 'render':161 'request':49,78,111 'request/response':177 'respons':188 'return':51,131,202 'schema':175 'servic':105 'settl':55 'span':95 'spars':152 'specif':37,113 'substant':169 'unit':73 'unknown':206 'upon':147 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'utility/infrastructure':104 'valid':133 'via':4,17 'wallet':165 'x402':5,18,43,92,134 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"f6e6d0c2-d5bf-4bc6-882d-e08175a9d7a5","listingId":"16e0a877-0246-42bb-9412-e7c7de0a4925","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/28/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":"2026-04-18T18:52:29.664Z"}],"sources":[{"listingId":"16e0a877-0246-42bb-9412-e7c7de0a4925","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/28/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:29.664Z","lastSeenAt":"2026-04-28T05:04:34.880Z"}],"details":{"listingId":"16e0a877-0246-42bb-9412-e7c7de0a4925","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/28/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/28/performance"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/28/performance"}],"useCases":["Retrieving performance metrics for portfolio #28 via a single micropayment","Programmatic portfolio performance monitoring by AI agents with USDC on Base","Integrating pay-per-call portfolio data into dashboards without API key management"],"bestFor":["Agents or apps that need on-demand portfolio performance data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Users who prefer crypto-native pay-per-request pricing over traditional API keys"],"notFor":["Users needing detailed API documentation or response schema before integrating","Bulk or high-frequency consumers who would benefit from subscription pricing","Anyone requiring portfolio data for IDs other than 28 (only this ID is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.089Z"},"updatedAt":"2026-04-28T05:04:34.880Z"}}