{"id":"9aeed51f-185e-468d-abf0-70da8139a345","shortId":"C58Anb","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 provides portfolio performance data for a specific portfolio (ID 26) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint sits under the finance category and appears to return performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint is confirmed live (returns a valid 402 challenge), but the actual shape of the response and what inputs it expects in the POST body are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","portfolio returns","finance API","x402 finance endpoint","crypto portfolio data"],"warnings":["No OpenAPI or schema documentation available — request body and response shape are completely unknown","All doc/pricing/API pages return only a 'Connect wallet' prompt with no content","Portfolio ID 26 is hardcoded in the URL; unclear if other portfolio IDs are accessible or what they represent","No information on what 'performance' data is actually returned (returns, time series, benchmarks, etc.)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/26/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/26/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","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 are empty stubs. The purpose of the endpoint can only be inferred from the URL path. This is effectively a stub 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'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48,207 'pre':127 'pre-defin':126 'price':105,153 'prompt':164 'protocol':146 'provid':31,84 'pure':141 'rate':134 'readm':156 'render':159 'request':49,78,109,177 'respons':182,199 'return':51,121,188 'schema':173 'settl':55 'shape':196 'sit':113 'span':95 'spars':150 'specif':37 'substant':167 'unit':73 'unknown':210 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'valid':190 'via':4,17 'wallet':163 'x402':5,18,43,92,144 'x402 finance endpoint' 'x402-gated':91 'x402-payment'","prices":[{"id":"bc7adc23-4e1a-4e78-acb4-04d112a1b1da","listingId":"9aeed51f-185e-468d-abf0-70da8139a345","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/26/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":"2026-04-18T18:52:27.294Z"}],"sources":[{"listingId":"9aeed51f-185e-468d-abf0-70da8139a345","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/26/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:27.294Z","lastSeenAt":"2026-04-28T17:35:16.382Z"}],"details":{"listingId":"9aeed51f-185e-468d-abf0-70da8139a345","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/26/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","source_url":"https://lowpaymentfee.com/api/v1/portfolios/26/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/26/performance"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve performance data for a tracked portfolio via a single micropayment","Integrate portfolio performance metrics into an automated trading or reporting pipeline","Agent-driven portfolio monitoring without API key management"],"bestFor":["Developers wanting keyless, pay-per-call portfolio performance data","AI agents that can settle x402 payments on Base","Quick one-off portfolio performance lookups without subscription commitments"],"notFor":["Users needing detailed documentation or schema before integrating","Bulk historical portfolio backtesting (no evidence of batch support)","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.202Z"},"updatedAt":"2026-04-28T17:35:16.382Z"}}