{"id":"40f6cf78-ae94-4dd2-a417-c43536234798","shortId":"XRTjxs","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 53) behind an x402 paywall. It 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).\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 uniformly at $0.02 per call. This particular endpoint falls 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 instantly upon valid x402 payment.\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 the response structure looks like.","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 request body schema or response schema provided; callers must guess at the expected input","The endpoint targets a hardcoded portfolio ID (53) with no explanation of what this portfolio contains","No OpenAPI or ai-plugin manifest discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/53/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/53/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 examples. The specific purpose of 'portfolio 53 performance' is opaque. This is effectively a stub 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'000':70 '0x8335':60 '20':69 '2913':61 '402':184 '53':38 '6':74 'accept':44 'access':132 'advertis':131 'ai/ml':91 'analyt':90 'api':87,125,147 'appear':113 'avail':175 'base':8,20,55,71 'behind':39 'bodi':194 'broad':81 'call':103 'catalog':82 'categori':111 'challeng':185 'confirm':179 'connect':155 'contract':59 'cost':64 'data':3,15,32,89 'decim':75 'defin':122 'detail':162 'doc':145 'document':140,188 'endpoint':26,106,177 'exampl':173 'expect':197 'extrem':142 'fall':107 'field':195 'financ':110 'finance/web3':93 'financial data API' 'gate':86 'grant':134 'host':79 'id':37 'infer':92 'infrastructur':95 'instant':135 'investment performance' 'json':49 'json-api' 'key':126 'like':204 'limit':129 'live':180 'look':203 'lowpaymentfee.com':28,78 'metric':117 'micropay':6,18 'micropayment' 'network':9,21,56 'no-api-key' 'openapi':166 'page':150 'particular':105 'payload':174 'payment':50,139 'paywal':42 'per':11,23,67,102 'perform':2,14,31,116 'portfolio':1,13,30,36,123 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'pre':121 'pre-defin':120 'price':98,146 'prompt':157 'proper':183 'provid':29,77 'rate':128 'readm':149 'render':152 'request':12,24,46,68,193 'request/response':169 'respons':201 'return':48,115,181 'schema':170 'settl':52 'span':88 'spars':143 'spec':167 'specif':35 'structur':202 'technic':161 'unclear':191 'uniform':99 'unit':72 'upon':136 'usdc':58 'usdc-base-network' 'use':57 'util':96 'valid':137 'via':4,16 'wallet':156 'without':187 'x402':5,17,41,85,138 'x402 finance endpoint' 'x402-gated':84 'x402-payment'","prices":[{"id":"843c2d73-3a27-46f9-b7a7-cec0adaabce3","listingId":"40f6cf78-ae94-4dd2-a417-c43536234798","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/53/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":"2026-04-18T18:53:01.354Z"}],"sources":[{"listingId":"40f6cf78-ae94-4dd2-a417-c43536234798","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/53/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:01.354Z","lastSeenAt":"2026-04-28T09:06:26.152Z"}],"details":{"listingId":"40f6cf78-ae94-4dd2-a417-c43536234798","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53/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/53/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/53/performance"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Programmatic access to financial portfolio analytics without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with pay-per-call pricing","Developers who want keyless, instant API access settled via USDC on Base","Lightweight integrations that don't need subscription commitments"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.596Z"},"updatedAt":"2026-04-28T09:06:26.152Z"}}