{"id":"0b116512-73bb-4999-9489-488534a11729","shortId":"uT4bne","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 returns portfolio performance data for portfolio ID 64. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and responds with a standard x402 payment challenge (HTTP 402). It accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified wallet address. No API keys or rate limits are advertised; access is gated purely by micropayment. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"portfolio performance\" data actually contains. The endpoint path suggests it returns performance metrics (e.g., returns, time series) for a specific portfolio (ID 64), but the exact fields and semantics are unknown. The platform advertises simple pricing at $0.02/request with no minimums, no commitments, and instant access.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","portfolio-performance","json-response","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio returns","x402 finance API","micropayment API","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response structure","Unknown what 'portfolio 64 performance' data actually contains — field names, data types, and semantics are undocumented","The endpoint path is specific to portfolio ID 64; it is unclear if other portfolio IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/64/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/64/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data is actually returned. The portfolio ID 64 is hardcoded in the path with no context. This is effectively a stub 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'0.02':10,23,101,215 '000':96 '20':95 '402':85 '6':108 '64':38,200 'Base network API' 'USDC API' 'accept':87 'access':131,224 'across':52 'actual':181 'address':122 'advertis':130,211 'ai/ml':55 'analyt':54 'api':51,124,150 'application/json':142 'base':8,21,68,97 'base-network' 'broader':44 'categori':59 'challeng':83 'charg':91 'commit':221 'connect':158 'contain':182 'content':164 'data':3,16,34,53,180 'decim':109 'descript':175 'doc':148 'document':143 'e.g':191 'endpoint':28,73,184 'exact':116,203 'exampl':172 'extrem':145 'field':204 'finance/web3':56 'gate':133 'http':84 'id':37,199 'infrastructur':58 'instant':223 'investment performance' 'json-response' 'key':125 'limit':128 'live':75 'lowpaymentfee' 'lowpaymentfee.com':30 'made':112 'maximum':93 'metric':190 'micropay':6,19,136 'micropayment API' 'mime':139 'minimum':219 'network':9,22,69 'offer':46 'openapi':168 'page':153 'part':41 'path':185 'pay':48 'pay-per-request':47 'payment':82,110 'per':49,103 'perform':2,15,33,179,189 'platform':45,210 'portfolio':1,14,32,36,178,198 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':88 'price':149,213 'prompt':160 'protocol':65 'pure':134 'rate':127 'readm':152 'render':155 'request':50,89,104 'request/response':171 'respond':77 'respons':138 'return':31,188,192 'schema':169 'scheme':117 'semant':206 'seri':194 'settl':61 'simpl':212 'sinc':105 'spars':146 'specif':197 'specifi':120 'standard':80 'suggest':186 'time':193 'type':140 'unit':98 'unknown':208 'usd':102 'usdc':13,26,71,100,106 'usdc-micropayment' 'use':70,107 'via':4,17,62,113 'wallet':121,159 'x402':5,18,64,81,115 'x402 finance API' 'x402-payment'","prices":[{"id":"487ac96e-0eb6-4ab5-b99e-98089d297cc2","listingId":"0b116512-73bb-4999-9489-488534a11729","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/64/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":"2026-04-18T18:53:17.638Z"}],"sources":[{"listingId":"0b116512-73bb-4999-9489-488534a11729","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/64/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:17.638Z","lastSeenAt":"2026-04-27T18:36:24.538Z"}],"details":{"listingId":"0b116512-73bb-4999-9489-488534a11729","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/64/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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64/performance"},{"claim":"Maximum amount required is 20000 base units of USDC (USD Coin, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64/performance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64/performance"}],"useCases":["Retrieving performance data for a specific investment portfolio","Integrating portfolio analytics into agent workflows via micropayment","Programmatic access to portfolio metrics without API key management"],"bestFor":["Agents needing on-demand portfolio performance data with no signup","Developers experimenting with x402 micropayment-gated APIs","Automated financial dashboards that pay per data fetch"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","Bulk historical portfolio data retrieval (no batch endpoint documented)","Non-crypto-native users who cannot send USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.804Z"},"updatedAt":"2026-04-27T18:36:24.538Z"}}