{"id":"634b7cb2-793f-4a27-afba-89f6c071290a","shortId":"rAh6zW","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","description":"This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 80) behind an x402 paywall. The endpoint accepts POST requests and returns 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). No API keys or rate limits are required — access is granted per-call via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broad 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. However, this specific endpoint (/api/v1/portfolios/80/performance) is not listed on the provider's landing page among the advertised API categories. Its exact response schema and the nature of the portfolio it tracks are undocumented. The endpoint is confirmed live via a valid 402 challenge, but no sample response or detailed documentation was found.\n\nBecause the crawled docs pages (docs, api, pricing, README) all returned only a \"Connect wallet\" stub with no substantive content, the actual data returned by this endpoint remains unknown. Users should expect a JSON response related to portfolio performance metrics, but the specific fields and data source cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","json-api","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","Base USDC API","pay-per-request portfolio data"],"warnings":["This specific endpoint (/api/v1/portfolios/80/performance) is not listed among the provider's advertised APIs — its purpose and data source are unclear.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' stubs with no content.","No response schema or example response is available; the structure of returned data is unknown.","The portfolio ID (80) is hardcoded in the path — it is unclear whether other portfolio IDs are available or what portfolio 80 represents."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/80/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/80/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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no response schema, no examples, and the endpoint is not even listed among the provider's advertised APIs. Docs pages are all 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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/80/performance","description":"Premium API 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<x402_payment_token>\"","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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/80/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, 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/80/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","On-demand financial data access without subscription or API key"],"bestFor":["Agents or apps needing one-off portfolio performance lookups","Developers wanting keyless, pay-per-call financial data","x402-compatible clients on the Base network"],"notFor":["Users needing documented response schemas before integration","High-frequency bulk data retrieval (no documented rate limits but per-call cost adds up)","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.17Z"},"updatedAt":"2026-04-27T15:34:26.138Z"}}