{"id":"e36b94b9-321a-447f-a187-a596ceae29d7","shortId":"8jQKVG","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 11) via the x402 payment protocol. 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 site 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 call. This particular endpoint sits under the finance category and serves portfolio performance metrics. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body fields are expected or what shape the response takes.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The specific portfolio ID (11) is hardcoded in the URL; unclear if other portfolio IDs exist or how they are created","No information on what fields the response contains or what POST body parameters are accepted"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/11/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/11/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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The purpose ('portfolio performance') is only inferable from the URL path and generic 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'post':46 'price':101,142 'prompt':153 'proper':179 'protocol':43 'provid':79 'pure':130 'rate':123 'readm':145 'render':148 'request':12,24,47,70,189 'request/response':165 'respond':49 'respons':198 'return':29,177 'schema':166 'serv':115 'settl':54 'shape':196 'sit':109 'site':80 'span':91 'spars':139 'spec':163 'specif':35 'take':199 'technic':157 'unclear':187 'unit':74 'usdc':60 'usdc-base-network' 'use':59 'util':99 'via':4,16,39 'wallet':152 'without':183 'x402':5,17,41,88,133 'x402 finance endpoint' 'x402-gated':87 'x402-payment'","prices":[{"id":"1dff75e8-4746-4e92-9518-62714b1ae504","listingId":"e36b94b9-321a-447f-a187-a596ceae29d7","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/11/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":"2026-04-18T18:52:16.450Z"}],"sources":[{"listingId":"e36b94b9-321a-447f-a187-a596ceae29d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/11/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:16.450Z","lastSeenAt":"2026-04-28T19:34:06.417Z"}],"details":{"listingId":"e36b94b9-321a-447f-a187-a596ceae29d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11/performance"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Programmatic portfolio monitoring by AI agents paying per-request via x402","Integrating portfolio performance data into dashboards or trading bots"],"bestFor":["Agents or apps that need on-demand portfolio performance data without API key management","Developers experimenting with x402 micropayment-gated finance APIs","Low-volume consumers who prefer pay-per-call over subscriptions"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-frequency consumers who need bulk pricing or subscription tiers","Anyone needing portfolio data for portfolio IDs other than 11 (no evidence other IDs are supported)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.739Z"},"updatedAt":"2026-04-28T19:34:06.417Z"}}