{"id":"2fe72f34-472d-4970-912f-cbd005668266","shortId":"weSy3T","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 82) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call. This particular endpoint falls under the finance category. The site advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\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 the actual shape of the portfolio performance response is unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","micropayment","json-api","post-method"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","finance API","x402 finance endpoint","lowpaymentfee"],"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","Endpoint is hardcoded to portfolio ID 82; unclear if other portfolio IDs are available or how portfolios are created","No information on what 'performance' data fields are returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/82/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/82/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 402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint is scoped to a single portfolio ID with no explanation of what data it returns. Effectively a stub 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'000':69 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':60 '20':68 '402':178 '6':73 '82':38 'accept':44 'access':123 'actual':182 'advertis':114 'ai/ml':91 'analyt':90 'api':87,116,141 'attach':126 'avail':169 'base':8,20,55,70 'behind':39 'broad':81 'call':103 'caller':124 'catalog':82 'categori':111 'challeng':179 'confirm':173 'connect':149 'contract':59 'cost':63 'data':3,15,32,89,94 'decim':74 'detail':156 'doc':139 'document':134 'endpoint':26,106,171 'exampl':167 'extrem':136 'fall':107 'financ':110 'finance API' 'finance/web3':93 'gate':86 'header':130 'host':76 'id':37 'infer':92 'instant':122 'investment performance' 'json':49 'json-api' 'key':117 'limit':120 'live':174 'lowpaymentfee' 'lowpaymentfee.com':28,78 'micropay':6,18 'micropayment' 'network':9,21,56 'offer':79 'openapi':160 'page':144 'particular':105 'payload':168 'payment':50,129 'paywal':42 'per':11,23,66,102 'perform':2,14,31,187 'portfolio':1,13,30,36,186 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':45 'post-method' 'price':99,140 'prompt':151 'proper':177 'provid':29 'rate':119 'readm':143 'render':146 'request':12,24,46,67,133 'request/response':163 'respons':188 'return':48,175 'schema':164 'servic':97 'settl':52 'shape':183 'simpli':125 'site':77,113 'span':88 'spars':137 'spec':161 'specif':35 'technic':155 'unit':71 'unknown':190 'usdc':58 'usdc-base' 'use':57 'util':96 'via':4,16 'wallet':150 'x402':5,17,41,85,128 'x402 finance endpoint' 'x402-gated':84 'x402-payment'","prices":[{"id":"2ad2b5a8-0618-4d29-a989-1355b7f990dd","listingId":"2fe72f34-472d-4970-912f-cbd005668266","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/82/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":"2026-04-18T18:53:25.448Z"}],"sources":[{"listingId":"2fe72f34-472d-4970-912f-cbd005668266","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/82/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:25.448Z","lastSeenAt":"2026-04-28T03:05:39.393Z"}],"details":{"listingId":"2fe72f34-472d-4970-912f-cbd005668266","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/82/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/82/performance"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/82/performance"}],"useCases":["Retrieve performance metrics for a tracked investment portfolio","Integrate portfolio performance data into dashboards or reporting tools","Automate portfolio monitoring via agent-driven micropayments"],"bestFor":["Agents or apps needing on-demand portfolio performance data without API key management","Developers experimenting with x402 micropayment-gated finance APIs","Low-volume, pay-per-call portfolio analytics"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-frequency trading or latency-sensitive applications (no SLA or rate-limit info available)","Users who need portfolio data for arbitrary portfolio IDs (this endpoint is scoped to portfolio 82)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.367Z"},"updatedAt":"2026-04-28T03:05:39.393Z"}}