{"id":"7b64c9b9-f343-4407-a057-d9605b9a523b","shortId":"YXueJT","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 34) 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 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 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 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 response data and any required request body fields 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","x402 finance API","pay-per-call portfolio data","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The endpoint is hardcoded to portfolio ID 34 with no explanation of what this portfolio contains","No examples of successful responses exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/34/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/34/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 x402 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 purpose of the endpoint (portfolio 34 performance) is only inferable from the URL path and generic 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '34':40 '402':191 '6':81 'accept':47 'access':138 'actual':195 'advertis':137 'ai/ml':98 'analyt':97 'api':94,131,154 'appear':119 'avail':182 'base':8,21,58,72 'behind':41 'bodi':205 'broad':88 'call':109 'catalog':89 'categori':117 'challeng':192 'confirm':186 'connect':162 'contract':62 'cost':68 'data':3,16,34,96,200 'decim':82 'defin':128 'detail':169 'doc':152 'document':147 'endpoint':28,46,112,184 'equal':75 'exampl':180 'extrem':149 'fall':113 'field':206 'financ':116 'finance/web3':100 'gate':93 'grant':140 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':132 'limit':135 'live':187 'lowpaymentfee' 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':173 'page':157 'particular':111 'pay-per-call portfolio data' 'payload':181 'payment':53,145 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,129 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':48 'pre':127 'pre-defin':126 'price':105,153 'prompt':164 'proper':190 'protocol':146 'provid':31,84 'pure':141 'rate':134 'readm':156 'render':159 'request':49,78,204 'request/response':176 'requir':203 'respons':199 'return':51,121,188 'schema':177 'settl':55 'shape':196 'span':95 'spars':150 'spec':174 'specif':37 'technic':168 'unit':73 'unknown':208 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'via':4,17 'wallet':163 'x402':5,18,43,92,144 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"b3c147fb-d1cf-47a0-ae2a-ae778abb1aa7","listingId":"7b64c9b9-f343-4407-a057-d9605b9a523b","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/34/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":"2026-04-18T18:52:37.530Z"}],"sources":[{"listingId":"7b64c9b9-f343-4407-a057-d9605b9a523b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/34/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:37.530Z","lastSeenAt":"2026-04-28T15:06:24.329Z"}],"details":{"listingId":"7b64c9b9-f343-4407-a057-d9605b9a523b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/34/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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/performance"},{"claim":"Payment is 20,000 base units of USDC (USD Coin) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/performance"},{"claim":"All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Automated portfolio monitoring with per-request micropayments"],"bestFor":["Agents or apps needing on-demand portfolio performance data without subscription commitments","Developers experimenting with x402 micropayment-gated APIs","Low-volume consumers who prefer pay-per-call pricing"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-frequency bulk data consumers who need negotiated pricing or rate guarantees","Anyone requiring portfolio customization — this endpoint is fixed to portfolio ID 34"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.676Z"},"updatedAt":"2026-04-28T15:06:24.329Z"}}