{"id":"413575b6-bf15-4a03-ad53-48a2a9269b4e","shortId":"9WpFFM","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network for $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint provides portfolio performance data for a specific portfolio (ID 63) hosted on lowpaymentfee.com. It uses the x402 payment protocol, accepting USDC payments on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe provider lowpaymentfee.com offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all priced at $0.02 per call with no API keys, no rate limits, and no commitments required. This particular endpoint falls under the Finance & Web3 category and returns JSON data about portfolio performance.\n\nThe endpoint is live and responds with a proper x402 challenge (HTTP 402) when called without payment. It accepts POST requests and settles payments via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. No OpenAPI schema or detailed documentation was found beyond the landing page listing, so the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No OpenAPI or request/response schema available","No documentation beyond the landing page listing","The specific portfolio (ID 63) purpose and data contents are undocumented","Docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/63/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/63/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live with a valid x402 challenge and clear pricing, but there is no OpenAPI schema, no documentation of request/response formats, and the crawled docs/pricing/README pages are empty beyond a wallet-connect prompt. The specific purpose of 'portfolio 63 performance' is 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'0.02':11,23,56,91 '000':58 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':148 '20':57 '402':133 '6':64 '63':36 'accept':46,139 'ai/ml':82 'analyt':81 'api':78,96 'base':8,20,51,59,150 'beyond':159 'bodi':168 'broad':71 'call':93,135 'catalog':72 'categori':113 'challeng':131 'commit':103 'contract':147 'cost':55 'data':3,15,30,80,117 'decim':65 'detail':155 'document':156 'endpoint':26,107,122 'exact':166 'fall':108 'financ':111 'finance/web3':84 'financial data API' 'format':169 'found':158 'host':37 'http':132 'id':35 'infer':83 'infrastructur':86 'investment performance' 'json':116 'json-response' 'key':97 'land':161 'limit':100 'list':163 'live':124 'lowpaymentfee.com':39,68 'micropay':6,18 'network':9,21,52 'no-api-key' 'offer':69 'openapi':152 'page':162 'particular':106 'pay':75 'pay-per-request':74 'payment':44,48,137,144 'per':76,92 'perform':2,14,29,120 'portfolio':1,13,28,34,119 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':140 'price':89 'proper':129 'protocol':45 'provid':27,67 'rate':99 'request':54,77,141,167 'requir':104 'respond':126 'respons':171 'return':115 'schema':153 'settl':143 'span':79 'specif':33 'structur':172 'unit':60 'unknown':174 'usdc':47,62,146 'usdc-base-network' 'use':41 'util':87 'via':4,16,145 'web3':112 'without':136 'x402':5,17,43,130 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"4e7a8f76-fe71-4854-800d-b15225851cea","listingId":"413575b6-bf15-4a03-ad53-48a2a9269b4e","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/63/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":"2026-04-18T18:53:04.961Z"}],"sources":[{"listingId":"413575b6-bf15-4a03-ad53-48a2a9269b4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/63/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:04.961Z","lastSeenAt":"2026-04-28T07:34:41.592Z"}],"details":{"listingId":"413575b6-bf15-4a03-ad53-48a2a9269b4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/63/performance \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63/performance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63/performance"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Integrating portfolio performance data into dashboards or agents","Programmatic access to portfolio returns without subscription commitments"],"bestFor":["Agents needing on-demand portfolio performance data without API key management","Developers wanting pay-per-use financial data on Base network","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing high-frequency bulk data pulls (no documented batch endpoint)","Anyone without USDC on Base network for payment","Users requiring detailed API documentation or schema guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.369Z"},"updatedAt":"2026-04-28T07:34:41.592Z"}}