{"id":"37010110-f55d-4ebe-bea7-64dc18363d36","shortId":"HvQRLz","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 58) 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 specific endpoint falls under the finance category and appears to return performance metrics for a 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 additional technical detail. 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 request body fields are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response bodies","The specific data returned by the portfolio performance endpoint is undocumented and unknown","Portfolio ID 58 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/58/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/58/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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual data returned is completely unknown, making this effectively a stub 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '402':189 '58':40 '6':81 'accept':47 'access':135 'actual':193 'addit':164 'advertis':134 'ai/ml':98 'analyt':97 'api':94,128,151 'appear':119 'avail':180 'base':8,21,58,72 'behind':41 'bodi':203 'broad':88 'call':109 'catalog':89 'categori':117 'challeng':190 'confirm':184 'connect':159 'contract':62 'cost':68 'data':3,16,34,96,198 'decim':82 'detail':166 'doc':149 'document':144,175 'endpoint':28,46,112,182 'equal':75 'exampl':178 'extrem':146 'fall':113 'field':204 'financ':116 'finance/web3':100 'financial data API' 'gate':93 'grant':137 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':129 'limit':132 'live':185 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':170 'page':154 'pay-per-request' 'payload':179 'payment':53,142 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,126 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'price':105,150 'prompt':161 'proper':188 'protocol':143 'provid':31,84 'pure':138 'rate':131 'readm':153 'render':156 'request':49,78,202 'request/response':173 'requir':201 'respons':197 'return':51,121,186 'schema':174 'settl':55 'shape':194 'span':95 'spars':147 'spec':171 'specif':37,111 'technic':165 'unit':73 'unknown':206 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'via':4,17 'wallet':160 'x402':5,18,43,92,141 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"e58ecaa6-b012-4604-96e7-d9c37f165af3","listingId":"37010110-f55d-4ebe-bea7-64dc18363d36","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/58/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":"2026-04-18T18:53:09.708Z"}],"sources":[{"listingId":"37010110-f55d-4ebe-bea7-64dc18363d36","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/58/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:09.708Z","lastSeenAt":"2026-04-27T20:08:58.404Z"}],"details":{"listingId":"37010110-f55d-4ebe-bea7-64dc18363d36","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/58/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/58/performance"},{"claim":"Payment is 20,000 base units of USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/58/performance"},{"claim":"All APIs on the site are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Paying per-request for financial data without subscription commitments"],"bestFor":["Agents needing on-demand portfolio performance data with no signup","Developers prototyping finance dashboards with micropayment-gated APIs","x402-compatible clients on the Base network"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.127Z"},"updatedAt":"2026-04-27T20:08:58.404Z"}}