{"id":"ca489456-8e35-4309-99f9-5c4de7aa16bb","shortId":"55kQ4v","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 94) 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 x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per call. This particular endpoint falls under the finance category and appears to deliver performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (402 challenge captured), but the actual shape of the response data is unknown. Callers should expect JSON output but will need to experiment to understand the exact fields returned.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","pay-per-call portfolio data","Base USDC API"],"warnings":["No OpenAPI spec or schema available for request or response","Documentation pages return only 'Connect wallet' with no technical content","This specific endpoint (/portfolios/94/performance) is not listed on the provider's homepage — its purpose and data source are unknown","Response format and fields are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/94/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/94/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 402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The portfolio endpoint (ID 94) is not listed on the provider's homepage, making its purpose and output entirely opaque. Effectively a stub 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'000':71 '0x8335':61 '20':70 '2913':62 '402':183 '6':75 '94':38 'Base USDC API' 'accept':44 'access':133 'actual':188 'addit':162 'advertis':132 'ai/ml':92 'analyt':91 'api':88,126,149 'appear':114 'avail':177 'base':8,20,56,72 'behind':39 'broad':82 'call':104 'caller':196 'captur':185 'catalog':83 'categori':112 'challeng':184 'confirm':181 'connect':157 'contract':60 'cost':65 'data':3,15,32,90,193 'decim':76 'defin':123 'deliv':116 'detail':164 'doc':147 'document':142 'endpoint':26,107,179 'exact':209 'exampl':175 'expect':198 'experi':205 'extrem':144 'fall':108 'field':210 'financ':111 'finance/web3':94 'gate':87 'grant':135 'header':141 'host':80 'id':37 'infer':93 'infrastructur':96 'investment performance' 'json':50,199 'json-api' 'key':127 'limit':130 'live':182 'lowpaymentfee.com':28,79 'metric':118 'micropay':6,18 'micropayment' 'need':203 'network':9,21,57 'no-api-key' 'openapi':168 'output':200 'page':152 'particular':106 'pay-per-call portfolio data' 'payload':176 'payment':51,140 'paywal':42 'per':11,23,68,103 'perform':2,14,31,117 'portfolio':1,13,30,36,124 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':45 'pre':122 'pre-defin':121 'price':99,148 'prompt':159 'provid':78 'pure':136 'rate':129 'readm':151 'render':154 'request':12,24,46,69 'request/response':171 'respond':48 'respons':192 'return':29,211 'schema':172 'settl':53 'shape':189 'span':89 'spars':145 'spec':169 'specif':35 'technic':163 'understand':207 'uniform':100 'unit':73 'unknown':195 'usdc':59 'usdc-base-network' 'use':58 'util':97 'via':4,16 'wallet':158 'x402':5,17,41,86,139 'x402 finance API' 'x402-gated':85 'x402-payment'","prices":[{"id":"0ee50cc0-8175-46ff-86a8-636290b7de48","listingId":"ca489456-8e35-4309-99f9-5c4de7aa16bb","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/94/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":"2026-04-18T18:53:44.090Z"}],"sources":[{"listingId":"ca489456-8e35-4309-99f9-5c4de7aa16bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/94/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:44.090Z","lastSeenAt":"2026-04-27T22:04:01.115Z"}],"details":{"listingId":"ca489456-8e35-4309-99f9-5c4de7aa16bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/94/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 402 with x402 challenge advertising USDC on Base at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/94/performance"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/94/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Developers experimenting with x402 micropayment protocols","Crypto-native workflows that can pay per call on Base"],"notFor":["Users needing detailed API documentation or response schemas before integrating","Bulk historical portfolio analysis requiring high-volume, low-latency access","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.483Z"},"updatedAt":"2026-04-27T22:04:01.115Z"}}