{"id":"3eb57b11-8bc7-4b1b-9895-6f6cc9279e2a","shortId":"Rc4FG2","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network for $0.02/request","tagline":"Portfolio performance data via x402 micropayment on Base network for $0.02/request","description":"This endpoint at lowpaymentfee.com provides portfolio performance data behind an x402 paywall. The specific resource `/api/v1/portfolios/9/performance` returns JSON data related to portfolio #9's performance metrics. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request via the x402 protocol. The platform advertises no API keys, no rate limits, and instant access. Payment is made by including an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the portfolio performance response actually contains. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual data payload and input parameters are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","portfolio tracking","financial performance API"],"warnings":["No API documentation available — /docs, /api, /pricing, /README all return only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","Only portfolio #9 is referenced in this endpoint; unclear if other portfolio IDs are valid","The nature and source of the portfolio performance data is unspecified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/9/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/9/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The actual data returned and accepted input parameters are completely 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'/api/v1/portfolios/9/performance':40 '/docs':144 '/pricing':146 '/readme':148 '/request':12,24 '0.02':11,23,61,103 '000':65 '20':64 '402':187 '6':69 '9':47 'access':121 'actual':179,195 'advertis':112 'ai/ml':93 'analyt':92 'api':89,114 'base':8,20,58,66 'behind':33 'broader':77 'call':88 'challeng':192 'confirm':184 'connect':154 'contain':180 'content':160 'crawl':143 'data':3,15,32,43,91,96,196 'decim':70 'descript':172 'detail':171 'document':138 'endpoint':26,72,182 'exampl':168 'extrem':140 'finance/web3':95 'financial performance API' 'header':131 'includ':126 'infer':94 'input':199 'instant':120 'investment performance' 'json':42 'json-response' 'key':115 'limit':118 'live':185 'lowpaymentfee.com':28,79 'made':124 'metric':50 'micropay':6,18 'network':9,21,59 'offer':81 'openapi':164 'page':149 'paramet':200 'part':74 'pay':86 'pay-per-cal':85 'pay-per-request' 'payload':197 'payment':51,122,130,136 'paywal':36 'per':62,87,104 'perform':2,14,31,49,177 'platform':78,111 'portfolio':1,13,30,46,176 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'price':101 'prompt':156 'proof':137 'protocol':109 'provid':29 'rate':117 'relat':44 'request':63,105 'request/response':167 'resourc':39 'respons':178 'return':41,151,186 'schema':165 'servic':99 'settl':53 'span':90 'spars':141 'specif':38 'substant':159 'unit':67 'unknown':202 'usdc':55 'usdc-base-network' 'util':98 'valid':134,190 'varieti':83 'via':4,16,106 'wallet':155 'x':129 'x-payment':128 'x402':5,17,35,108,135,191 'x402-payment'","prices":[{"id":"ebdd8f57-064f-406b-a097-dc5e12e468ff","listingId":"3eb57b11-8bc7-4b1b-9895-6f6cc9279e2a","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/9/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":"2026-04-18T18:53:41.047Z"}],"sources":[{"listingId":"3eb57b11-8bc7-4b1b-9895-6f6cc9279e2a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/9/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:41.047Z","lastSeenAt":"2026-04-27T22:33:23.135Z"}],"details":{"listingId":"3eb57b11-8bc7-4b1b-9895-6f6cc9279e2a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/9/performance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/9/performance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/9/performance"}],"useCases":["Retrieving performance metrics for a specific 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 no subscription","Developers wanting frictionless pay-per-call finance APIs on Base","x402-compatible clients looking for low-cost financial data endpoints"],"notFor":["Users who need detailed API documentation or response schema before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio data for portfolios other than #9 (only this specific resource is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.66Z"},"updatedAt":"2026-04-27T22:33:23.135Z"}}