{"id":"b5fb2996-e21d-40cc-930f-aa3b4db52b49","shortId":"PHLRUv","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 provides portfolio performance data for a specific portfolio (ID 50) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with USDC's 6 decimals = $0.02). No API keys or rate limits are required; access is granted per-request via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. This specific endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. However, the exact response schema and input parameters are not documented; the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further detail.\n\nBecause there is no OpenAPI spec, no response schema, and no documentation beyond the landing page listing, the precise fields returned by this endpoint are unknown. Agents should expect a JSON response containing portfolio performance data, but the structure must be discovered empirically after payment.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","financial performance data","x402 finance API","Base USDC API"],"warnings":["No OpenAPI or response schema available — response structure is unknown","Documentation pages (docs, pricing, API, README) all returned only 'Connect wallet' with no usable content","The specific portfolio ID (50) is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what they represent","No input body schema documented for the POST request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/50/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/50/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no documentation, and no example responses. The docs/pricing/API pages all render only a wallet-connect prompt. This is effectively a stub listing with verified 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'portfolio':1,13,30,36,143,206 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':45 'pre':141 'pre-defin':140 'precis':191 'price':119,158 'prompt':168 'protocol':93 'provid':29,95 'rate':79 'request':12,24,46,88,123 'requir':82 'respons':147,180,204 'return':48,135,163,193 'schema':148,181 'servic':117 'settl':52 'site':96 'span':108 'spec':178 'specif':35,125 'structur':211 'unit':68 'unknown':198 'usdc':54,70 'usdc-base-network' 'util':116 'via':4,16,89 'wallet':167 'x402':5,17,41,91 'x402 finance API' 'x402-payment'","prices":[{"id":"b750c62c-4abf-4085-aa6c-4b0b807f1176","listingId":"b5fb2996-e21d-40cc-930f-aa3b4db52b49","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd 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<x402-payment-token>\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/portfolios/50/performance","method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/50/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/50/performance"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or trading bots","Agents autonomously purchasing financial analytics without API key provisioning"],"bestFor":["Developers wanting frictionless pay-per-call portfolio data","AI agents that can settle x402 payments on Base","Quick one-off portfolio performance lookups without subscription commitments"],"notFor":["Users needing bulk historical portfolio data at scale (no documented batch endpoint)","Anyone requiring detailed API documentation or guaranteed response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.601Z"},"updatedAt":"2026-04-28T09:06:26.093Z"}}