{"id":"d796d3af-2c88-4d6b-9e4b-ed37ffb767b3","shortId":"8mJ2sg","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 69) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) on Base. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nThe specific portfolio endpoint (`/api/v1/portfolios/69/performance`) likely returns performance metrics for a tracked portfolio, though the exact response schema is not documented. The platform's docs, pricing, and API pages are behind a wallet-connect gate and provide no additional detail. Because there is no OpenAPI spec, no response schema, and no example payloads, the precise fields and semantics of the response remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","micropayment","pay-per-request","json-api"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance endpoint","x402 finance API","USDC micropayment API","Base network API","portfolio analytics","lowpaymentfee"],"warnings":["No OpenAPI or response schema available — response format is unknown","All documentation pages (docs, pricing, API, README) are behind a wallet-connect gate and returned no useful content","This endpoint is specific to portfolio ID 69; it is unclear whether other portfolio IDs are supported or what portfolio 69 represents","The platform lists many API categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/69/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/69/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example request/response, and all documentation pages are gated behind wallet-connect with no content. The purpose of the specific portfolio 69 endpoint is only inferrable from the URL 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'/request':11,22 '0.02':10,21,60,107 '000':103 '20':102 '6':111 '69':36 'Base network API' 'USDC micropayment API' 'accept':73 'addit':171 'ai/ml':52 'analyt':51 'api':56,118,159 'base':8,19,69,104,114 'behind':162 'broader':47 'call':128 'caller':87 'commit':126 'connect':166 'data':3,14,30,50 'decim':112 'detail':172 'doc':156 'document':152 'endpoint':24,72,135 'exact':147 'exampl':184 'field':188 'finance/web3':53 'gate':167 'handl':81 'header':93 'i.e':106 'id':35 'includ':88 'independ':130 'infrastructur':55 'inlin':82 'investment performance endpoint' 'json':78 'json-api' 'key':119 'like':137 'limit':122 'lowpaymentfee' 'lowpaymentfee.com':26 'metric':140 'micropay':6,17 'micropayment' 'network':9,20,70 'offer':49 'openapi':177 'page':160 'paid':131 'part':44 'pay-per-request' 'payload':185 'payment':40,79,92,98 'per':61 'perform':2,13,29,139 'platform':48,154 'portfolio':1,12,28,34,134,144 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':74 'precis':187 'price':58,157 'protocol':41,86 'provid':169 'rate':121 'remain':194 'request':62,75 'respons':148,180,193 'return':27,77,138 'schema':149,181 'semant':190 'settl':64 'sign':96 'sinc':108 'spec':178 'specif':33,133 'subscript':125 'though':145 'track':143 'unit':105 'unknown':195 'usdc':66,97,109 'usdc-base' 'use':110 'via':4,15,37,83 'wallet':165 'wallet-connect':164 'x':91 'x-payment':90 'x402':5,16,39,85 'x402 finance API' 'x402-payment'","prices":[{"id":"fb27594a-25e5-44d1-bdce-b55fcb9b1a65","listingId":"d796d3af-2c88-4d6b-9e4b-ed37ffb767b3","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/69/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":"2026-04-18T18:53:13.402Z"}],"sources":[{"listingId":"d796d3af-2c88-4d6b-9e4b-ed37ffb767b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/69/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:13.402Z","lastSeenAt":"2026-04-27T20:08:58.555Z"}],"details":{"listingId":"d796d3af-2c88-4d6b-9e4b-ed37ffb767b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/69/performance \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/69/performance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/69/performance"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/69/performance"}],"useCases":["Retrieve performance data for a tracked portfolio on demand","Integrate portfolio analytics into an agent workflow without API key management","Pay-per-call portfolio monitoring from automated trading bots"],"bestFor":["Agents or bots that need on-demand portfolio performance data without subscriptions","Developers prototyping x402 micropayment integrations on Base","Scenarios where keyless, pay-per-request access is preferred"],"notFor":["Users who need detailed documentation or guaranteed response schemas before integrating","High-frequency polling where per-request costs would accumulate quickly","Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 69)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.929Z"},"updatedAt":"2026-04-27T20:08:58.555Z"}}