{"id":"add210c5-d3ae-4de5-a39c-c7ae312f19d8","shortId":"sbPr3a","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 a specific portfolio (ID 20) 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 an exact-scheme micropayment 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 market data, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint sits 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, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available from the crawl. The exact fields returned by the portfolio performance endpoint are unknown and must be discovered by making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","micropayment","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial performance API","portfolio tracking","x402 finance API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","Endpoint is hardcoded to portfolio ID 20; unclear if other portfolio IDs are supported","Provider hosts many diverse API categories (AI, analytics, finance, utils) all at $0.02 — unclear what backing services actually power these endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/20/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/20/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 and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The purpose of the endpoint can only be inferred from its URL 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'0.02':10,23,78,111 '000':73 '0x8335':63 '20':40,72 '2913':64 '6':83 'accept':47 'access':142 'advertis':141 'ai/ml':100 'analyt':99 'api':96,135,157 'appear':123 'avail':186 'base':8,21,58,74 'behind':41 'broad':90 'call':113 'catalog':91 'categori':121 'connect':166 'contract':62 'crawl':189 'data':3,16,34,98,104 'decim':84 'defin':132 'deliv':125 'detail':173 'discov':204 'doc':156 'document':151 'endpoint':28,46,116,198 'equal':77 'exact':68,191 'exact-schem':67 'exampl':184 'extrem':153 'field':192 'financ':120 'finance/web3':102 'financial performance API' 'gate':95 'grant':144 'header':150 'host':88 'id':39 'infer':101 'infrastructur':106 'investment performance' 'json':52 'json-api' 'key':136 'limit':139 'lowpaymentfee.com':30,87 'make':206 'market':103 'metric':127 'micropay':6,19,70 'micropayment' 'must':202 'network':9,22,59 'no-api-key' 'openapi':177 'page':161 'paid':208 'particular':115 'pay-per-request' 'payload':185 'payment':53,149 'paywal':44 'per':79,112 'perform':2,15,33,126,197 'portfolio':1,14,32,38,133,196 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'pre':131 'pre-defin':130 'price':109,158 'prompt':168 'provid':86 'pure':145 'rate':138 'readm':160 'render':163 'request':49,80,209 'request/response':180 'return':31,51,193 'schema':181 'scheme':69 'settl':55 'sit':117 'span':97 'spars':154 'spec':178 'specif':37 'technic':172 'unit':75 'unknown':200 'usdc':13,26,61,81 'usdc-base-network' 'use':60,82 'util':107 'via':4,17 'wallet':167 'x402':5,18,43,94,148 'x402 finance API' 'x402-gated':93 'x402-payment'","prices":[{"id":"10bc2a3c-11c6-410b-95f2-37889a904998","listingId":"add210c5-d3ae-4de5-a39c-c7ae312f19d8","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/20/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":"2026-04-18T18:52:24.891Z"}],"sources":[{"listingId":"add210c5-d3ae-4de5-a39c-c7ae312f19d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/20/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:24.891Z","lastSeenAt":"2026-04-28T04:34:05.295Z"}],"details":{"listingId":"add210c5-d3ae-4de5-a39c-c7ae312f19d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/20/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":"The x402 challenge requires 20,000 base units of USDC on Base network per request","source_url":"https://lowpaymentfee.com/api/v1/portfolios/20/performance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/20/performance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/portfolios/20/performance"}],"useCases":["Fetching performance metrics for a tracked portfolio via automated agent","Integrating portfolio performance data into a dashboard without API key management","Pay-per-call access to financial portfolio analytics from an AI agent"],"bestFor":["Agents needing on-demand portfolio performance data without subscription commitments","Developers prototyping finance dashboards who want instant API access","x402-native workflows on Base network settling in USDC"],"notFor":["Users who need detailed API documentation or response schema before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio performance for arbitrary portfolio IDs (this endpoint is fixed to portfolio 20)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.325Z"},"updatedAt":"2026-04-28T04:34:05.295Z"}}