{"id":"fe7bbb6b-1c08-469b-8747-235afc5a99d7","shortId":"5EEbBD","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 90) 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 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 substantive content. There is no OpenAPI schema, no description of request parameters, and no example of the response payload. The exact fields returned by the portfolio performance endpoint are unknown. Callers should expect a JSON response but will need to experiment to understand the schema.","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 OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The specific portfolio ID 90 is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what this portfolio represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/90/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/90/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 OpenAPI schema, no documentation of request/response fields, and no examples. The docs pages are empty. This is effectively a stub listing with confirmed liveness but minimal usable 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '6':81 '90':40 'accept':47 'access':138 'advertis':137 'ai/ml':98 'analyt':97 'api':94,131,154 'appear':119 'base':8,21,58,72 'behind':41 'broad':88 'caller':197 'catalog':89 'categori':117 'connect':162 'content':168 'contract':62 'cost':68 'data':3,16,34,96 'decim':82 'defin':128 'descript':175 'doc':152 'document':147 'endpoint':28,46,112,194 'equal':75 'exact':187 'exampl':181 'expect':199 'experi':207 'extrem':149 'fall':113 'field':188 'financ':116 'finance/web3':100 'financial data API' 'gate':93 'grant':140 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52,201 'json-api' 'key':132 'limit':135 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'need':205 'network':9,22,59 'no-api-key' 'openapi':172 'page':157 'paramet':178 'particular':111 'payload':185 'payment':53,145 'paywal':44 'per':77,108 'perform':2,15,33,122,193 'portfolio':1,14,32,38,129,192 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'pre':127 'pre-defin':126 'price':105,153 'prompt':164 'protocol':146 'provid':31,84 'pure':141 'rate':134 'readm':156 'render':159 'request':49,78,109,177 'respons':184,202 'return':51,121,189 'schema':173,211 'settl':55 'span':95 'spars':150 'specif':37 'substant':167 'understand':209 'unit':73 'unknown':196 '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 endpoint' 'x402-gated':91 'x402-payment'","prices":[{"id":"c08905a7-ce02-4c06-a021-8b124510d481","listingId":"fe7bbb6b-1c08-469b-8747-235afc5a99d7","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/90/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":"2026-04-18T18:53:36.248Z"}],"sources":[{"listingId":"fe7bbb6b-1c08-469b-8747-235afc5a99d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/90/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:36.248Z","lastSeenAt":"2026-04-27T22:33:23.011Z"}],"details":{"listingId":"fe7bbb6b-1c08-469b-8747-235afc5a99d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/90/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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked portfolio via automated agent","Integrating portfolio performance data into a dashboard without API key management","Pay-per-call access to financial portfolio data on Base L2"],"bestFor":["Agents needing on-demand portfolio performance data without subscription commitments","Developers experimenting with x402 micropayment-gated finance APIs","Low-volume consumers who prefer pay-per-request pricing"],"notFor":["Users needing detailed API documentation or guaranteed response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.825Z"},"updatedAt":"2026-04-27T22:33:23.011Z"}}