{"id":"5773ab75-5517-4943-86a5-7b002432f952","shortId":"ZhtwPs","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 68) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","micropayment","json-api","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","Base USDC micropayment","portfolio returns","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","Request body schema is unknown; no input parameters are documented","Response format is unknown; no output schema or example responses available","Endpoint is scoped to a single portfolio ID (68); unclear if other portfolio IDs are accessible at different paths"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/68/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/68/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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs pages are empty. This is effectively a stub listing with only the x402 challenge as 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'0.02':10,23,76,108 '000':71 '0x8335':63 '20':70 '2913':64 '402':192 '6':81 '68':40 'Base USDC micropayment' 'accept':47 'access':139 'advertis':138 'ai/ml':98 'analyt':97 'api':94,132,155 'appear':120 'base':8,21,58,72 'behind':41 'bodi':198 'broad':88 'catalog':89 'categori':118 'challeng':193 'confirm':187 'connect':163 'content':169 'contract':62 'cost':68 'data':3,16,34,96,101 'decim':82 'defin':129 'descript':176 'doc':153 'document':148 'endpoint':28,46,113,185 'equal':75 'exact':196 'exampl':182 'extrem':150 'fall':114 'financ':117 'finance/web3':100 'format':199 'gate':93 'grant':141 'host':86 'id':39 'infer':99 'infrastructur':103 'investment performance' 'json':52 'json-api' 'key':133 'limit':136 'live':188 'lowpaymentfee' 'lowpaymentfee.com':30,85 'maximum':67 'metric':124 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':173 'page':158 'paramet':179 'particular':112 'pay-per-request' 'payment':53,146 'paywal':44 'per':77,109 'perform':2,15,33,123 'portfolio':1,14,32,38,130 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48 'pre':128 'pre-defin':127 'price':106,154 'prompt':165 'proper':191 'protocol':147 'provid':31,84 'pure':142 'rate':135 'readm':157 'render':160 'request':49,78,110,178,197 'respons':183,201 'return':51,122,189 'schema':174 'settl':55 'span':95 'spars':151 'specif':37 'structur':202 'substant':168 'unit':73 'unknown':204 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':104 'via':4,17 'wallet':164 'x402':5,18,43,92,145 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"874a1489-1c1a-4f39-959c-4b45a216d936","listingId":"5773ab75-5517-4943-86a5-7b002432f952","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/68/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":"2026-04-18T18:53:17.016Z"}],"sources":[{"listingId":"5773ab75-5517-4943-86a5-7b002432f952","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/68/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:17.016Z","lastSeenAt":"2026-04-27T18:36:24.538Z"}],"details":{"listingId":"5773ab75-5517-4943-86a5-7b002432f952","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/68/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 network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68/performance"},{"claim":"All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve performance metrics for portfolio #68 on demand","Integrate portfolio performance data into trading dashboards","Automated agents querying portfolio returns via x402 micropayments"],"bestFor":["Agents that need on-demand portfolio performance data without API key management","Developers experimenting with x402 micropayment-gated finance APIs","Low-volume, pay-per-call access to portfolio analytics"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-frequency bulk data retrieval where per-request pricing adds up","Querying arbitrary portfolio IDs (this endpoint is fixed to portfolio 68)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.803Z"},"updatedAt":"2026-04-27T18:36:24.538Z"}}