{"id":"10409235-e614-46ea-8bff-7752bfec7adf","shortId":"C2hPG3","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 27. 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/27/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 the x402 payment header.\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 path suggests it returns performance metrics (e.g., returns, gains/losses) for a specific portfolio, but the exact schema is unknown.","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 returns","x402 finance API","micropayment API","Base USDC API","portfolio analytics"],"warnings":["No OpenAPI or schema documentation available — response format is entirely unknown","All doc/pricing/README pages return only 'Connect wallet' with no content","Portfolio ID 27 is hardcoded in the path; unclear if other portfolio IDs are available or how they are discovered","No information on what POST body (if any) is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/27/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/27/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 and returns a valid x402 challenge with clear pricing, 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 path. Effectively a stub 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'/request':11,24 '0.02':10,23,81,111 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '20':105 '27':38 '6':116 'Base USDC API' 'accept':88 'access':132 'address':120 'advertis':131 'ai/ml':56 'analyt':55 'api':52,125,148 'base':8,21,78,107,123 'broader':44 'challeng':96 'confirm':97 'connect':157 'contain':182 'content':163 'crawl':146 'crypto':59 'data':3,16,34,54 'decim':117 'descript':174 'doc':147 'document':141 'e.g':191 'endpoint':28,64,86,184 'exact':200 'exampl':171 'extrem':143 'field':177 'financ':58 'gains/losses':193 'gate':134 'header':140 'id':37 'infer':57 'investment performance' 'json':93 'json-api' 'key':126 'limit':129 'live':100 'lowpaymentfee.com':30 'maximum':103 'metric':190 'micropay':6,19 'micropayment API' 'network':9,22,79 'no-api-key' 'offer':46 'openapi':167 'page':152 'paid':118 'part':41 'path':185 'pay':49 'pay-per-request':48 'payment':71,139 'per':50,82 'perform':2,15,33,180,189 'platform':45,67 'portfolio':1,14,32,36,179,197 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':89 'price':149 'prompt':159 'protocol':72 'pure':135 'rate':128 'readm':151 'request':51,83,90 'request/response':170 'requir':101 'respons':181 'return':31,92,154,188,192 'schema':168,201 'servic':62 'settl':73 'sinc':113 'span':53 'spars':144 'specif':85,196 'substant':162 'suggest':186 'unit':108 'unknown':203 'usd':112 'usdc':13,26,75,110,114 'usdc-base' 'use':68,115 'util':61 'various':47 'via':4,17 'wallet':158 'x402':5,18,70,95,138 'x402 finance API' 'x402-payment'","prices":[{"id":"ed2d2ed4-b76a-4ff7-8fca-17dcc4d6b621","listingId":"10409235-e614-46ea-8bff-7752bfec7adf","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/27/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":"2026-04-18T18:52:31.466Z"}],"sources":[{"listingId":"10409235-e614-46ea-8bff-7752bfec7adf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/27/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:31.466Z","lastSeenAt":"2026-04-28T03:33:43.510Z"}],"details":{"listingId":"10409235-e614-46ea-8bff-7752bfec7adf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/27/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 x402 challenge requiring 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/27/performance"},{"claim":"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/27/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Programmatic access to portfolio analytics without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Developers wanting x402-native pay-per-call finance endpoints","Crypto-native workflows settling micropayments in USDC on Base"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","Bulk historical portfolio data retrieval (no batch or streaming support documented)","Non-crypto payment workflows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.917Z"},"updatedAt":"2026-04-28T03:33:43.510Z"}}