{"id":"e3d3c33d-e27c-407b-8f2d-55240aa41ab2","shortId":"sc88Jh","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 returns portfolio performance data for a specific portfolio (ID 97) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This particular endpoint falls under the finance category and appears to deliver portfolio performance metrics, though the exact response schema is not documented.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no example request/response payloads, and no description of what fields the portfolio performance response contains. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is difficult to know what input parameters are expected or what output is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No API documentation available; docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or response schema provided — response format is unknown","This specific endpoint (/api/v1/portfolios/97/performance) is not listed on the provider's homepage catalog of available APIs","Portfolio ID 97 is hardcoded in the URL; unclear if other portfolio IDs are supported or how they are obtained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/97/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/97/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 x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no example requests or responses, no description of the portfolio performance payload. The specific endpoint (portfolios/97) is not even listed on the provider's homepage catalog. This is effectively a stub 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'000':71 '0x8335':61 '20':70 '2913':62 '402':190 '6':75 '97':38 'accept':44 'ai/ml':93 'analyt':92 'api':89,108,145 'appear':125 'base':8,20,56,72 'behind':39 'broad':82 'call':88 'catalog':83 'categori':123 'challeng':191 'commit':115 'confirm':184 'connect':154 'contain':180 'content':160 'contract':60 'cost':65 'data':3,15,32,91,96 'decim':76 'deliv':127 'descript':172 'difficult':197 'doc':144 'document':138,139,194 'endpoint':26,118,182 'exact':133 'exampl':167 'expect':204 'extrem':141 'fall':119 'field':175 'financ':122 'finance/web3':95 'financial data API' 'host':80 'id':37 'infer':94 'input':201 'investment performance' 'json':50 'json-response' 'key':109 'know':199 'limit':112 'live':185 'lowpaymentfee.com':28,79 'metric':130 'micropay':6,18 'network':9,21,57 'no-api-key' 'openapi':164 'output':207 'page':149 'paramet':202 'particular':117 'pay':86 'pay-per-cal':85 'pay-per-request' 'payload':169 'payment':51 'paywal':42 'per':11,23,68,87,104 'perform':2,14,31,129,178 'portfolio':1,13,30,36,128,177 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'price':101,146 'prompt':156 'provid':78 'rate':111 'readm':148 'render':151 'request':12,24,46,69,105 'request/response':168 'respond':48 'respons':134,179 'return':29,186,209 'schema':135 'servic':99 'settl':53 'span':90 'spars':142 'spec':165 'specif':35 'though':131 'unit':73 'usdc':59 'usdc-base-network' 'use':58 'util':98 'valid':188 'via':4,16 'wallet':155 'without':193 'x402':5,17,41,189 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"25c88864-1d3c-417a-b57e-e3021383f838","listingId":"e3d3c33d-e27c-407b-8f2d-55240aa41ab2","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/97/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":"2026-04-18T18:53:46.500Z"}],"sources":[{"listingId":"e3d3c33d-e27c-407b-8f2d-55240aa41ab2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/97/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:46.500Z","lastSeenAt":"2026-04-27T20:35:16.998Z"}],"details":{"listingId":"e3d3c33d-e27c-407b-8f2d-55240aa41ab2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/97/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":"The endpoint returns a 402 x402 challenge with USDC on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/97/performance"},{"claim":"The 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/97/performance"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into a dashboard or agent workflow","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with micropayments","Developers who want keyless, pay-per-call financial data access on Base"],"notFor":["Users needing detailed API documentation or response schema before integrating","Bulk historical portfolio data retrieval (no documented batch or pagination support)","Non-crypto users who cannot pay via USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.365Z"},"updatedAt":"2026-04-27T20:35:16.998Z"}}