{"id":"64301985-e860-4704-98e9-3dd25461efdb","shortId":"wbMZsb","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a specified portfolio (portfolio ID 1 in this case). It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, and utility categories. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and is gated by the x402 payment protocol (version 1). When called without payment, it returns a 402 challenge specifying the accepted payment scheme (exact), the USDC asset contract on Base (0x8335…2913), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific fields returned by the portfolio performance endpoint are unknown. The endpoint is confirmed live via the captured 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","micropayment","pay-per-request","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only a 'Connect wallet' prompt with no technical content.","No request or response schema is documented; the fields returned by the portfolio performance endpoint are unknown.","No OpenAPI or ai-plugin manifest found.","The provider hosts many diverse endpoints (AI, finance, utilities) all at $0.02 — unclear whether these are production-quality services or demonstration/placeholder APIs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/1/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/1/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, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no example payloads, and documentation pages are empty beyond a wallet-connect prompt. The actual data returned is entirely 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'/docs':170 '/pricing':172 '/readme':174 '0.02':10,22,77,138 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':126 '1':39,104 '20':133 '2913':127 '300':152 '402':112,221 '6':142 'accept':92,116 'addit':185 'address':148 'ai/ml':63 'amount':131 'analyt':62 'api':54 'application/json':160 'asset':122 'avail':201 'base':8,20,88,125,135 'beyond':162 'broader':48 'call':106 'captur':220 'case':42 'categori':68 'challeng':113,222 'confirm':216 'connect':180 'contract':123 'data':3,15,32,61 'decim':143 'detail':187 'document':161,196 'enabl':53 'endpoint':26,70,91,210,214 'exact':119 'exampl':199 'extrem':167 'field':204 'financ':65 'financial data API' 'gate':97 'given':139 'i.e':137 'id':38 'infer':64 'investment performance' 'json-response' 'land':164 'live':217 'lowpaymentfee.com':28 'made':146 'maximum':130 'micropay':6,18 'micropayment' 'mime':157 'model':82 'network':9,21,89 'offer':55 'openapi':191 'page':165,175 'part':45 'pay-per-request' 'payload':200 'payment':101,108,117,144 'per':11,23,79 'per-request':78 'perform':2,14,31,209 'platform':73 'portfolio':1,13,30,36,37,208 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':93 'price':81 'prompt':182 'protocol':102 'provid':59 'render':177 'request':12,24,80,94 'request/response':194 'respons':156 'return':29,110,205 'schema':195 'scheme':118 'second':153 'settl':83 'share':74 'span':60 'spars':168 'spec':192 'specif':203 'specifi':35,114 'suit':49 'technic':186 'timeout':154 'type':158 'uniform':76 'unit':136 'unknown':212 'usdc':85,121,140 'usdc-base' 'util':67 'version':103 'via':4,16,218 'wallet':181 'without':107 'x402':5,17,52,100 'x402 finance API' 'x402-enabled':51 'x402-payment'","prices":[{"id":"36fa098e-47cc-4e6b-b1be-97ad484e8b3e","listingId":"64301985-e860-4704-98e9-3dd25461efdb","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/1/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":"2026-04-18T18:52:18.243Z"}],"sources":[{"listingId":"64301985-e860-4704-98e9-3dd25461efdb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/1/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:18.243Z","lastSeenAt":"2026-04-28T18:34:28.640Z"}],"details":{"listingId":"64301985-e860-4704-98e9-3dd25461efdb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/1/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 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/portfolios/1/performance"},{"claim":"The provider lists uniform $0.02/request pricing across all endpoints 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/1/performance"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Integrating portfolio performance data into dashboards or trading bots","Agents autonomously purchasing financial data without API keys"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 micropayments on Base","Prototyping financial dashboards without subscription commitments"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-frequency bulk data retrieval where per-request costs add up","Anyone without a Base-compatible wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.622Z"},"updatedAt":"2026-04-28T18:34:28.640Z"}}