{"id":"71407ef7-fd23-4e3b-a14d-9bade327a140","shortId":"tCfHB3","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 portfolio ID 62. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/portfolios/62/performance` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys or rate limits are advertised; access is gated purely by micropayment.\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 description of request parameters, and no example of the response payload. The portfolio ID 62 is hardcoded in the URL, and it is unclear whether other portfolio IDs are available or what fields the performance response contains. Use with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","micropayment portfolio data","Base USDC API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt with no content.","No request body schema or response schema documented; request parameters and response fields are unknown.","Portfolio ID 62 is hardcoded in the URL; it is unclear what this portfolio represents or whether other IDs exist.","The broader platform lists many API categories but this specific endpoint's data source and accuracy are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/62/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/62/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of the endpoint can only be inferred from the URL 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'/request':11,24 '0.02':10,23,81,111 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '20':105 '6':116 '62':38,181 'Base USDC API' 'accept':88 'access':132 'address':120 'advertis':131 'ai/ml':56 'analyt':55 'api':52,125,145 'avail':196 'base':8,21,78,107,123 'broader':44 'caution':206 'challeng':96 'confirm':97 'connect':154 'contain':203 'content':160 'crawl':143 'crypto':59 'data':3,16,34,54 'decim':117 'descript':167 'doc':144 'document':138,209 'endpoint':28,64,86 'exampl':173 'extrem':140 'field':199 'financ':58 'gate':134 'hardcod':183 'id':37,180,194 'infer':57 'investment performance' 'json':93 'json-api' 'key':126 'limit':129 'live':100 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':103 'micropay':6,19,137 'micropayment portfolio data' 'network':9,22,79 'no-api-key' 'offer':46 'openapi':164 'page':149 'paid':118 'paramet':170 'part':41 'pay':49 'pay-per-request':48 'payload':177 'payment':71 'per':50,82 'perform':2,15,33,201 'platform':45,67 'portfolio':1,14,32,36,179,193 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':89 'price':146 'prompt':156 'protocol':72 'pure':135 'rate':128 'readm':148 'request':51,83,90,169 'requir':101 'respons':176,202 'return':31,92,151 'schema':165 'servic':62 'settl':73 'sinc':113 'span':53 'spars':141 'specif':85 'substant':159 'surfac':210 'unclear':190 'unit':108 'url':186 'usd':112 'usdc':13,26,75,110,114 'usdc-base' 'use':68,115,204 'util':61 'various':47 'via':4,17 'wallet':155 'whether':191 'x402':5,18,70,95 'x402 finance API' 'x402-payment'","prices":[{"id":"fe28df51-2a9a-45d6-a8de-d7de0b02ec5c","listingId":"71407ef7-fd23-4e3b-a14d-9bade327a140","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/62/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":"2026-04-18T18:53:08.525Z"}],"sources":[{"listingId":"71407ef7-fd23-4e3b-a14d-9bade327a140","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/62/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:08.525Z","lastSeenAt":"2026-04-27T20:08:58.329Z"}],"details":{"listingId":"71407ef7-fd23-4e3b-a14d-9bade327a140","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/62/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 requiring 20,000 base units of USDC (0.02 USD) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/62/performance"},{"claim":"The platform 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/62/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Paying per-request for financial data without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no subscription","Developers experimenting with x402 micropayment-gated APIs","Scenarios where pay-per-call is preferred over monthly billing"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","Bulk historical portfolio data retrieval (no batch endpoint documented)","Non-crypto-native users unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.148Z"},"updatedAt":"2026-04-27T20:08:58.329Z"}}