{"id":"4ab92621-52d2-48bf-8b79-0613c07fbfd0","shortId":"Jd42wW","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 specific portfolio (ID 44) as JSON. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs, all gated behind x402 micropayments on the Base network using USDC.\n\nThe endpoint accepts POST requests and is priced at a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is made via the x402 protocol's X-PAYMENT header, settling on-chain to a specified address on Base. The platform advertises no API keys, no rate limits, and instant access — you pay per request with no minimums or commitments.\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 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 from available sources.","tags":[],"capabilities":["x402-micropayment","portfolio-performance","usdc-payment","base-network","pay-per-request","json-response"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","x402 finance endpoint","micropayment API","portfolio tracking"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all returned only 'Connect wallet' with no content.","No OpenAPI or output schema describing the response fields.","The specific portfolio (ID 44) is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what data this portfolio represents.","Request body schema for the POST method is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/44/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/44/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 schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The purpose of the endpoint (portfolio 44 performance) is only inferable from the URL path; no field-level detail is 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'/docs':142 '/pricing':144 '/readme':146 '0.02':10,22,90 '000':81 '20':80 '402':183 '44':38 '6':86 'accept':70 'access':126 'actual':188 'address':112 'advertis':117 'ai/ml':51 'analyt':50 'api':56,119 'avail':196 'base':8,20,64,82,114 'base-network' 'behind':59 'broader':46 'call':92 'captur':185 'chain':108 'challeng':184 'commit':135 'confirm':181 'connect':152 'contain':177 'content':158 'crawl':141 'data':3,15,32,49,189 'decim':87 'descript':169 'document':136 'endpoint':26,69,179 'equal':89 'exampl':166 'extrem':138 'field':172 'finance/web3':53 'financial data API' 'gate':58 'header':104 'id':37 'infer':52 'infrastructur':55 'instant':125 'investment performance' 'json':40 'json-response' 'key':120 'limit':123 'live':182 'lowpaymentfee.com':28 'made':95 'maximum':78 'micropay':6,18,61 'micropayment API' 'minimum':133 'network':9,21,65 'offer':48 'on-chain':106 'openapi':162 'page':147 'part':43 'pay':128 'pay-per-request' 'payment':93,103,192 'per':11,23,91,129 'perform':2,14,31,175 'platform':47,116 'portfolio':1,13,30,36,174 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':71 'price':75 'prompt':154 'protocol':99 'rate':122 'request':12,24,72,130 'request/response':165 'respons':176 'return':29,149,190 'schema':163 'settl':105 'sourc':197 'spars':139 'specif':35 'specifi':111 'substant':157 'unit':83 'unknown':194 'usdc':67,85 'usdc-payment' 'use':66 'via':4,16,96 'wallet':153 'x':102 'x-payment':101 'x402':5,17,60,98 'x402 finance endpoint' 'x402-micropayment'","prices":[{"id":"e7ab5545-24fc-41b6-90f4-5f580e586c8b","listingId":"4ab92621-52d2-48bf-8b79-0613c07fbfd0","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/44/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":"2026-04-18T18:52:51.273Z"}],"sources":[{"listingId":"4ab92621-52d2-48bf-8b79-0613c07fbfd0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/44/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:51.273Z","lastSeenAt":"2026-04-27T22:33:21.041Z"}],"details":{"listingId":"4ab92621-52d2-48bf-8b79-0613c07fbfd0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/44/performance \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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/44/performance"},{"claim":"Platform pricing is $0.02 per request 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/44/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Programmatic access to financial portfolio data without API key registration"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Developers who prefer pay-per-call crypto micropayments over subscription billing","Quick integration where no API key management is desired"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.055Z"},"updatedAt":"2026-04-27T22:33:21.041Z"}}