{"id":"46af3907-21a0-4107-9fb9-21541a1334c8","shortId":"3982B3","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 73) behind an x402 paywall. It 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 site 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 call. This specific endpoint falls under the finance category and appears to return performance metrics for a given portfolio. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the response and any required request body fields are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","Base USDC API","micropayment API","portfolio returns"],"warnings":["No OpenAPI or schema available — request body and response shape are entirely unknown","Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content","This specific portfolio endpoint (/portfolios/73/performance) is not listed in the provider's public API catalog","No information on what portfolio ID 73 represents or whether other portfolio IDs are accessible"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/73/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/73/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 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The portfolio endpoint itself is not listed on the provider's homepage catalog. Effectively a stub with confirmed 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'0.02':10,23,75,107 '000':70 '0x8335':62 '20':69 '2913':63 '402':189 '6':80 '73':40 'Base USDC API' 'accept':46 'access':136 'actual':193 'advertis':135 'ai/ml':98 'analyt':97 'api':94,129,152 'appear':119 'avail':180 'base':8,21,57,71 'behind':41 'bodi':202 'broad':88 'call':109 'catalog':89 'categori':117 'challeng':190 'confirm':184 'connect':160 'contract':61 'cost':67 'data':3,16,34,96 'decim':81 'detail':167 'doc':150 'document':145 'endpoint':28,112,182 'equal':74 'exampl':178 'extrem':147 'fall':113 'field':203 'financ':116 'finance/web3':100 'gate':93 'given':126 'grant':138 'header':144 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':51 'json-api' 'key':130 'limit':133 'live':185 'lowpaymentfee.com':30,85 'maximum':66 'metric':123 'micropay':6,19 'micropayment' 'micropayment API' 'network':9,22,58 'no-api-key' 'openapi':171 'page':155 'pay-per-request' 'payload':179 'payment':52,143 'paywal':44 'per':76,108 'perform':2,15,33,122 'portfolio':1,14,32,38,127 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':47 'price':105,151 'prompt':162 'proper':188 'provid':31,83 'pure':139 'rate':132 'readm':154 'render':157 'request':48,77,201 'request/response':174 'requir':200 'respons':197 'return':50,121,186 'schema':175 'settl':54 'shape':194 'site':84 'span':95 'spars':148 'spec':172 'specif':37,111 'technic':166 'unit':72 'unknown':205 'usdc':13,26,60,78 'usdc-base-network' 'use':59,79 'util':103 'via':4,17,140 'wallet':161 'x402':5,18,43,92,142 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"18cb76f6-69dc-4de9-b221-5b17d9c6f591","listingId":"46af3907-21a0-4107-9fb9-21541a1334c8","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/73/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":"2026-04-18T18:53:23.055Z"}],"sources":[{"listingId":"46af3907-21a0-4107-9fb9-21541a1334c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/73/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:23.055Z","lastSeenAt":"2026-04-27T17:05:04.965Z"}],"details":{"listingId":"46af3907-21a0-4107-9fb9-21541a1334c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/73/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 HTTP 402 with x402 challenge on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/73/performance"},{"claim":"Payment is 20,000 base units of USDC (USD Coin) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/73/performance"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/73/performance"}],"useCases":["Retrieve performance metrics for a tracked portfolio","Integrate portfolio performance data into dashboards or trading bots","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without subscriptions","AI agents that can settle x402 payments on Base","Projects wanting keyless, pay-per-use financial data"],"notFor":["Users who need detailed API documentation or schemas before integrating","Bulk historical data downloads (pay-per-request model may be costly at scale)","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.481Z"},"updatedAt":"2026-04-27T17:05:04.965Z"}}