{"id":"c7e733e4-06d5-4635-82c9-9df37df46da3","shortId":"8nnzM9","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 52) 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, and infrastructure utilities — all priced at $0.02 per request. The specific endpoint listed here (/api/v1/portfolios/52/performance) is not featured on the provider's landing page catalog, suggesting it may be a specialized or less-publicized route. No OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content.\n\nBecause there is no schema describing what fields the POST body should contain or what the response looks like, agents calling this endpoint will need to experiment or obtain documentation out-of-band. The endpoint is confirmed live (returns a proper x402 402 challenge), and the pricing is clear and low.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","Base USDC API","portfolio returns","lowpaymentfee"],"warnings":["No OpenAPI or input/output schema available — request body format is unknown","No documentation beyond the x402 challenge; docs pages return only 'Connect wallet'","This specific endpoint (/api/v1/portfolios/52/performance) is not listed in the provider's public API catalog","Portfolio ID 52 is hardcoded in the path; unclear if other portfolio IDs are available or what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/52/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/52/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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages only show a wallet-connect prompt. The endpoint path is not listed in the provider's own catalog, adding uncertainty about its purpose and expected 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'/request':11,24 '0.02':10,23,76,108 '000':71 '0x8335':63 '20':70 '2913':64 '402':210 '52':40 '6':81 'Base USDC API' 'accept':47 'addit':165 'agent':186 'ai/ml':98 'analyt':97 'api':94,154 'band':200 'base':8,21,58,72 'behind':41 'bodi':177 'broad':88 'call':187 'catalog':89,126 'challeng':211 'clear':216 'confirm':204 'connect':160 'contain':179 'content':166 'contract':62 'cost':68 'crawl':149 'data':3,16,34,96 'decim':82 'describ':172 'detail':144 'doc':151 'document':145,196 'endpoint':28,46,113,189,202 'equal':75 'exampl':142 'experi':193 'featur':119 'field':174 'financ':100 'found':147 'gate':93 'host':86 'id':39 'infer':99 'infrastructur':103 'investment performance' 'json':52 'json-api' 'land':124 'less':135 'less-public':134 'like':185 'list':114 'live':205 'look':184 'low':218 'lowpaymentfee' 'lowpaymentfee.com':30,85 'maximum':67 'may':129 'micropay':6,19 'micropayment' 'need':191 'network':9,22,59 'obtain':195 'openapi':139 'out-of-band':197 'page':125,155 'pay-per-request' 'payment':53 'paywal':44 'per':77,109 'perform':2,15,33 'portfolio':1,14,32,38 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48,176 'price':106,152,214 'prompt':162 'proper':208 'provid':31,84,122 'public':136 'request':49,78,110 'request/response':141 'respons':183 'return':51,157,206 'rout':137 'schema':140,171 'settl':55 'span':95 'special':132 'specif':37,112 'suggest':127 'unit':73 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':104 'via':4,17 'wallet':161 'web3':101 'x402':5,18,43,92,209 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"9a9102fd-0930-4f99-b2ac-cb5c5c3132bb","listingId":"c7e733e4-06d5-4635-82c9-9df37df46da3","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/52/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":"2026-04-18T18:52:53.056Z"}],"sources":[{"listingId":"c7e733e4-06d5-4635-82c9-9df37df46da3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/52/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:53.056Z","lastSeenAt":"2026-04-27T22:33:21.088Z"}],"details":{"listingId":"c7e733e4-06d5-4635-82c9-9df37df46da3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/52/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/52/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/52/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages all returned only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or reporting tools","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without API key management","AI agents that can settle x402 payments on Base in USDC","Low-volume or sporadic access to portfolio analytics at $0.02/call"],"notFor":["High-frequency bulk data retrieval where per-request costs add up","Users who need detailed API documentation or 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":"2026-02-17T23:13:59.97Z"},"updatedAt":"2026-04-27T22:33:21.088Z"}}