{"id":"a1d69a54-5ab9-49cf-909b-5355f5c991e8","shortId":"f7z6t6","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 portfolio ID 24. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The max amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is independently paid. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional 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 returned), but the actual data contract is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","portfolio returns","financial performance data","x402 finance API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt","No request or response schema provided; the data contract is unknown","Only portfolio ID 24 is referenced at this specific endpoint; unclear if other portfolio IDs are supported","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/24/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/24/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The actual data returned is completely unknown, and only a single portfolio ID (24) is referenced. This is effectively a stub 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'000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '20':98 '24':36 '300':137 '402':187 '6':109 'accept':72 'across':50 'actual':192 'addit':161 'address':133 'ai/ml':53 'amount':95 'analyt':52 'api':49,114,147 'base':8,20,66,100 'broader':42 'call':124 'categori':57 'challeng':188 'commit':122 'confirm':185 'connect':156 'contain':181 'content':162 'contract':194 'crawl':145 'data':3,15,32,51,193 'decim':110 'descript':173 'doc':146 'document':140 'endpoint':26,71,183 'exact':91 'exampl':170 'extrem':142 'field':176 'finance/web3':54 'financial performance data' 'handl':80 'header':87 'id':35 'independ':126 'infrastructur':56 'inlin':81 'investment performance' 'json':77 'json-response' 'key':115 'limit':118 'live':186 'lowpaymentfee.com':28 'max':94 'micropay':6,18 'network':9,21,67 'no-api-key' 'offer':44 'openapi':166 'page':151 'paid':127 'part':39 'pay':46 'pay-per-request':45 'payment':78,86,129 'per':11,23,47 'perform':2,14,31,179 'platform':43 'portfolio':1,13,30,34,178 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':73 'price':148 'prompt':158 'protocol':63 'rate':117 'readm':150 'request':12,24,48,74 'request/response':169 'requir':96 'respons':180 'return':29,76,153,189 'schema':167 'scheme':92 'second':138 'sent':131 'settl':59 'sinc':106 'spars':143 'subscript':121 'timeout':139 'unit':101 'unknown':196 'usd':105 'usdc':69,103,107 'usdc-base-network' 'use':68,88,108 'via':4,16,60,82 'wallet':157 'x':85 'x-payment':84 'x402':5,17,62,90 'x402 finance API' 'x402-payment'","prices":[{"id":"9ff04f63-4734-4913-a03b-90057edfbd31","listingId":"a1d69a54-5ab9-49cf-909b-5355f5c991e8","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/24/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":"2026-04-18T18:52:32.055Z"}],"sources":[{"listingId":"a1d69a54-5ab9-49cf-909b-5355f5c991e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/24/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:32.055Z","lastSeenAt":"2026-04-28T03:33:43.491Z"}],"details":{"listingId":"a1d69a54-5ab9-49cf-909b-5355f5c991e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/24/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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/24/performance"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/24/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","On-demand portfolio analytics without subscription overhead"],"bestFor":["Agents needing one-off portfolio performance lookups via micropayment","Developers who want keyless, pay-per-call access to financial data","Crypto-native workflows already on the Base network"],"notFor":["Users needing bulk or historical portfolio data across many portfolios (only portfolio 24 is exposed at this path)","Anyone requiring detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.982Z"},"updatedAt":"2026-04-28T03:33:43.491Z"}}