{"id":"faa044d8-b00e-417a-8463-61a8d0d56f85","shortId":"zWdUPr","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 37) 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 request. This particular endpoint falls under the finance category and appears to return performance metrics for a tracked portfolio. No API keys or rate limits are advertised; access is granted purely via 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 content. There is no OpenAPI spec, no request/response schema documentation, 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 POST body fields are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key","pay-per-request"],"categories":["finance"],"synonyms":["portfolio tracker","investment performance","portfolio analytics","financial data API","portfolio returns","x402 finance API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No request body schema documented; unknown what POST body fields are expected","No response schema documented; the shape of the performance data is unknown","Portfolio ID 37 is hardcoded in the URL; unclear if other portfolio IDs are accessible or how portfolios are created","Provider appears to be a generic x402 demo site with many endpoints; quality and reliability of underlying data is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/37/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/37/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The purpose of the endpoint can only be inferred from the URL 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '37':40 '402':189 '6':81 'accept':47 'access':136 'actual':193 'advertis':135 'ai/ml':98 'analyt':97 'api':94,129,152 'appear':119 'avail':180 'base':8,21,58,72 'behind':41 'bodi':203 'broad':88 'catalog':89 'categori':117 'challeng':190 'confirm':184 'connect':160 'content':166 'contract':62 'cost':68 'data':3,16,34,96,198 'decim':82 'doc':150 'document':145,175 'endpoint':28,46,112,182 'equal':75 'exampl':178 'extrem':147 'fall':113 'field':204 'financ':116 'finance/web3':100 'financial data API' 'gate':93 'grant':138 'header':144 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':130 'limit':133 'live':185 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':170 'page':155 'particular':111 'pay-per-request' 'payload':179 'payment':53,143 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,127 'portfolio analytics' 'portfolio returns' 'portfolio tracker' 'portfolio-performance' 'post':48,202 'price':105,151 'prompt':162 'proper':188 'provid':31,84 'pure':139 'rate':132 'readm':154 'render':157 'request':49,78,109 'request/response':173 'requir':201 'respons':197 'return':51,121,186 'schema':174 'settl':55 'shape':194 'span':95 'spars':148 'spec':171 'specif':37 'track':126 'unit':73 'unknown':206 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'via':4,17,140 'wallet':161 'x402':5,18,43,92,142 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"9a94d01c-fc37-4108-b246-4279542c8ed9","listingId":"faa044d8-b00e-417a-8463-61a8d0d56f85","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/37/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":"2026-04-18T18:52:39.337Z"}],"sources":[{"listingId":"faa044d8-b00e-417a-8463-61a8d0d56f85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/37/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.337Z","lastSeenAt":"2026-04-28T15:06:24.378Z"}],"details":{"listingId":"faa044d8-b00e-417a-8463-61a8d0d56f85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/37/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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/37/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/37/performance"},{"claim":"Maximum amount required is 20000 base units ($0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/37/performance"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a tracked investment 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 finance APIs","Low-volume consumers who prefer pay-per-call pricing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-frequency trading systems requiring sub-second latency guarantees","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.637Z"},"updatedAt":"2026-04-28T15:06:24.378Z"}}