{"id":"9d62c1b8-3504-4b7b-8e5d-fc78de11d84d","shortId":"bQpPuc","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 12) behind an x402 paywall. It accepts POST requests and returns 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 minimum commitments. The specific endpoint probed here sits under the finance category and appears to return performance metrics for a portfolio resource.\n\nDocumentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual response format and required request body are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","micropayment API","pay-per-call portfolio data","Base USDC API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","This specific endpoint (/api/v1/portfolios/12/performance) is not listed among the provider's advertised APIs on the homepage","Request body format is unknown — no examples or field descriptions available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/12/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/12/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty. The portfolio endpoint is not even listed on the provider's homepage catalog, making its purpose and data format entirely 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'000':70 '0x8335':60 '12':38 '20':69 '2913':61 '402':181 '6':74 'Base USDC API' 'accept':44 'actual':185 'ai/ml':92 'analyt':91 'api':88,107,142 'appear':127 'avail':171 'base':8,20,55,71 'behind':39 'bodi':191 'broad':81 'call':87 'catalog':82 'categori':125 'challeng':182 'commit':115 'confirm':175 'connect':151 'content':157 'contract':59 'cost':64 'data':3,15,32,90,95 'decim':75 'doc':141 'document':136,166 'endpoint':26,118,173 'exampl':169 'extrem':138 'financ':124 'finance/web3':94 'format':187 'host':79 'id':37 'infer':93 'investment performance' 'json':49 'json-api' 'key':108 'limit':111 'live':176 'lowpaymentfee.com':28,78 'metric':131 'micropay':6,18 'micropayment API' 'minimum':114 'network':9,21,56 'no-api-key' 'openapi':161 'page':146 'pay':85 'pay-per-cal':84 'pay-per-call portfolio data' 'pay-per-request' 'payload':170 'payment':50 'paywal':42 'per':11,23,67,86,103 'perform':2,14,31,130 'portfolio':1,13,30,36,134 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':45 'price':100,143 'probe':119 'prompt':153 'provid':29,77 'rate':110 'readm':145 'render':148 'request':12,24,46,68,104,190 'request/response':164 'requir':189 'resourc':135 'respons':186 'return':48,129,177 'schema':165 'servic':98 'settl':52 'sit':121 'span':89 'spec':162 'specif':35,117 'thin':139 'unit':72 'unknown':193 'usdc':58 'usdc-base-network' 'use':57 'util':97 'valid':179 'via':4,16 'wallet':152 'x402':5,17,41,180 'x402 finance API' 'x402-payment'","prices":[{"id":"b0b9a190-927c-4968-9e6d-074ee092c1e7","listingId":"9d62c1b8-3504-4b7b-8e5d-fc78de11d84d","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/12/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":"2026-04-18T18:52:18.215Z"}],"sources":[{"listingId":"9d62c1b8-3504-4b7b-8e5d-fc78de11d84d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/12/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:18.215Z","lastSeenAt":"2026-04-28T06:34:17.330Z"}],"details":{"listingId":"9d62c1b8-3504-4b7b-8e5d-fc78de11d84d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/12/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/12/performance"},{"claim":"Payment is 20,000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/12/performance"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a tracked investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","On-demand portfolio analytics without subscription or API key management"],"bestFor":["Agents needing one-off portfolio performance lookups via crypto micropayment","Developers who want keyless, pay-per-use access to financial data","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","Bulk or high-frequency portfolio data retrieval where per-call pricing adds up","Users without USDC on Base network or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.643Z"},"updatedAt":"2026-04-28T06:34:17.330Z"}}