{"id":"f2300109-d280-476e-927b-3c91e5703d60","shortId":"GFeGZD","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 provides portfolio performance data for a specific portfolio (ID 72) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broader 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. However, this specific endpoint is scoped to portfolio performance. The exact schema of the response body is not documented in the crawled material; the endpoint description is simply \"Premium API Access\" and no OpenAPI spec or detailed field-level documentation was found.\n\nBecause the endpoint returned a valid 402 challenge with a well-formed x402 v1 payload, it is confirmed live. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base mainnet USDC). The maximum timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","pay-per-request","json-response"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No OpenAPI or response schema available — response format is unknown","Documentation pages (/docs, /pricing, /README) returned no meaningful content","The specific portfolio ID (72) is hardcoded in the endpoint path; unclear if other portfolio IDs are available or how they are created","No information on what fields the performance response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/72/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/72/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema documentation, no example responses, and the crawled docs/pricing/README pages were all empty beyond a 'Connect wallet' prompt. The purpose ('portfolio performance') is only inferable from the URL path and generic 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'000':64 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':186 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':193 '20':63 '300':204 '402':168 '6':68 '72':38 'accept':44 'access':78,149 'address':184 'ai/ml':106 'analyt':105 'api':71,102,148 'asset':190 'base':8,20,57,65,194 'behind':39 'bodi':134 'broader':95 'call':62,101 'catalog':96 'challeng':169 'confirm':180 'contract':191 'crawl':140 'data':3,15,32,104,109 'decim':69 'descript':144 'detail':155 'document':137,159 'endpoint':26,122,143,164 'exact':129 'field':157 'field-level':156 'finance/web3':108 'financial data API' 'form':174 'found':161 'grant':80 'host':93 'howev':119 'id':37 'infer':107 'investment performance' 'json':49 'json-response' 'key':72 'level':158 'limit':75 'live':181 'lowpaymentfee.com':28,92 'mainnet':195 'materi':141 'maximum':198 'micropay':6,18 'network':9,21,58 'openapi':152 'pay':99 'pay-per-cal':98 'pay-per-request' 'payload':177 'payment':50,87,183,201 'paywal':42 'per':11,23,61,82,100,117 'per-request':81 'perform':2,14,31,127 'portfolio':1,13,30,36,126 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'premium':147 'price':114 'protocol':88 'provid':29,90 'rate':74 'request':12,24,46,83,118 'requir':77 'respons':133 'return':48,165 'schema':130 'scope':124 'second':205 'servic':112 'settl':52 'settlement':202 'simpli':146 'site':91 'span':103 'spec':153 'specif':35,121 'timeout':199 'unit':66 'usdc':54,189,196 'usdc-base' 'util':111 'v1':176 'valid':167 'via':4,16,84 'well':173 'well-form':172 'x402':5,17,41,86,175 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"486ef8b3-0d79-4f6d-b519-1b7783d76932","listingId":"f2300109-d280-476e-927b-3c91e5703d60","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/72/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":"2026-04-18T18:53:22.422Z"}],"sources":[{"listingId":"f2300109-d280-476e-927b-3c91e5703d60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/72/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:22.422Z","lastSeenAt":"2026-04-27T17:05:04.927Z"}],"details":{"listingId":"f2300109-d280-476e-927b-3c91e5703d60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/72/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/portfolios/72/performance","method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/72/performance"},{"claim":"Price is $0.02 per request (20000 base units USDC, 6 decimals) on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/72/performance"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve performance metrics for a tracked portfolio on-demand","Integrate portfolio performance data into an automated trading or reporting pipeline","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without API key management","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic access patterns where pay-per-call is cheaper than a subscription"],"notFor":["High-frequency polling where per-request costs would accumulate quickly","Users who need detailed API documentation or response schema guarantees before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.544Z"},"updatedAt":"2026-04-27T17:05:04.927Z"}}