{"id":"3880b534-77fa-4d61-8005-6fb78e6546b6","shortId":"nBj8Uf","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 77) behind an x402 paywall. The endpoint 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 endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety 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, the specific endpoint being listed here is scoped to portfolio performance. No detailed documentation, request schema, or response schema was found in the crawl — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint path includes a hardcoded portfolio ID (77), it is unclear whether this is a demo/sample portfolio or whether other portfolio IDs are available. The lack of input/output schema documentation means callers will need to experiment to determine the expected POST body and response format.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking"],"warnings":["No request or response schema documented — callers must guess the POST body format","Hardcoded portfolio ID 77 in the URL; unclear if other portfolios are accessible","All documentation pages (docs, API, pricing, README) returned no substantive content","No OpenAPI spec or AI plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/77/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/77/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 request/response schema, no documentation beyond a landing page, and the portfolio ID is hardcoded with no explanation. Docs pages returned only 'Connect wallet' with no 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'000':65 '20':64 '6':69 '77':38,177 'accept':45 'access':79 'ai/ml':112 'analyt':111 'api':72,108,152 'avail':193 'base':8,20,58,66 'behind':39 'bodi':211 'broader':96 'call':63,107 'caller':201 'connect':161 'content':167 'crawl':149 'data':3,15,32,110,115 'decim':70 'demo/sample':185 'detail':138 'determin':207 'doc':151 'document':139,199 'endpoint':26,44,91,128,170 'expect':209 'experi':205 'finance/web3':114 'financial data API' 'format':214 'found':146 'grant':81 'hardcod':174 'howev':125 'id':37,176,191 'includ':172 'infer':113 'input/output':197 'investment performance' 'json':50 'json-api' 'key':73 'lack':195 'limit':76 'list':130 'lowpaymentfee.com':28,98 'mean':200 'micropay':6,18 'need':203 'network':9,21,59 'offer':100 'page':156 'part':93 'path':171 'pay':105 'pay-per-cal':104 'pay-per-request' 'payment':51,88 'paywal':42 'per':11,23,62,83,106,123 'per-request':82 'perform':2,14,31,136 'platform':97 'portfolio':1,13,30,36,135,175,186,190 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':46,210 'price':120,153 'prompt':163 'protocol':89 'provid':29 'rate':75 'readm':155 'request':12,24,47,84,124,140 'requir':78 'respons':143,213 'return':49,158 'schema':141,144,198 'scope':133 'servic':118 'settl':53 'span':109 'specif':35,127 'substant':166 'unclear':180 'unit':67 'usdc':55 'usdc-base' 'util':117 'varieti':102 'via':4,16,85 'wallet':162 'whether':181,188 'x402':5,17,41,87 'x402-payment'","prices":[{"id":"95244c79-3f75-46fa-a565-b62e52d2eb16","listingId":"3880b534-77fa-4d61-8005-6fb78e6546b6","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 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\\\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 accepting USDC on Base network at 20,000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/77/performance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/77/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Programmatic portfolio monitoring by AI agents with micropayments","Integrating portfolio performance data into dashboards or reports"],"bestFor":["Agents needing on-demand 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