{"id":"063fc734-1bb2-4311-bd61-bd8da7f4ae15","shortId":"6GmnRu","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 45) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under the Finance & Web3 category and is likely designed to return performance metrics (e.g., returns, time-series data) for a given investment portfolio.\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 without documentation it is difficult to know exactly what data is returned or what request body parameters are expected.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio returns","investment performance","portfolio analytics","portfolio tracking","financial performance API","portfolio metrics"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt","No OpenAPI or request/response schema provided; request body format and response fields are unknown","This specific endpoint (/portfolios/45) targets a hardcoded portfolio ID; unclear if other portfolio IDs are available or how to discover them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/45/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/45/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 with a valid x402 402 challenge and clear pricing ($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 is only inferable from the URL 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'payment':51 'paywal':42 'per':11,23,68,87,103 'perform':2,14,31,130,182 'portfolio':1,13,30,36,142,181 'portfolio analytics' 'portfolio metrics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'price':100 'prompt':161 'provid':78 'rate':110 'request':12,24,46,69,104,208 'request/response':172 'respond':48 'respons':183 'return':29,129,133,156,205 'schema':170 'seri':136 'settl':53 'span':90 'spars':146 'specif':35,116 'substant':164 'time':135 'time-seri':134 'unit':73 'usdc':59 'usdc-base' 'use':58 'util':98 'via':4,16 'wallet':160 'web3':122 'without':194 'x402':5,17,41 'x402-payment'","prices":[{"id":"845fee01-64a2-4780-a51a-31d9072d97f6","listingId":"063fc734-1bb2-4311-bd61-bd8da7f4ae15","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/45/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":"2026-04-18T18:52:53.661Z"}],"sources":[{"listingId":"063fc734-1bb2-4311-bd61-bd8da7f4ae15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/45/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:53.661Z","lastSeenAt":"2026-04-28T10:33:48.468Z"}],"details":{"listingId":"063fc734-1bb2-4311-bd61-bd8da7f4ae15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/45/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/45/performance"},{"claim":"Provider 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/45/performance"}],"useCases":["Retrieving performance data for a tracked investment portfolio","Integrating portfolio performance metrics into a dashboard or agent workflow","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Micropayment-based access to financial data on Base network","Developers who want keyless, pay-per-call financial APIs"],"notFor":["Users needing detailed API documentation or schema before integrating","Bulk historical data exports requiring thousands of calls (cost adds up at $0.02 each)","Non-crypto-native users who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.846Z"},"updatedAt":"2026-04-28T10:33:48.468Z"}}