{"id":"b736b2ce-9514-44d1-bcf0-3eb1be6e04fa","shortId":"abL8JU","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 56) 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 pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This particular endpoint falls under the finance category and appears to deliver performance metrics for a pre-defined portfolio. However, no detailed documentation, request schema, or response schema is available; the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further content.\n\nBecause there is no OpenAPI spec, no example responses, and no documentation describing what fields the portfolio performance response contains or what parameters the POST body accepts, consumers should expect to experiment or contact the provider for details. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-request","json-response"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No request body schema or response schema provided","No OpenAPI or ai-plugin manifest found","Portfolio ID 56 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are created"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/56/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/56/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 and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the endpoint is only inferable from the URL path. This is effectively a stub 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'0.02':10,23,76,109 '000':71 '0x8335':63 '20':70 '2913':64 '402':217 '56':40 '6':81 'accept':47,197 'ai/ml':99 'analyt':98 'api':95,114,157 'appear':131 'avail':152 'base':8,21,58,72 'behind':41 'bodi':196 'broad':88 'call':94 'catalog':89 'categori':129 'challeng':218 'commit':121 'confirm':212 'connect':164 'consum':198 'contact':204 'contain':190 'content':170 'contract':62 'cost':68 'data':3,16,34,97,102 'decim':82 'defin':140 'deliv':133 'describ':183 'detail':144,208 'doc':154 'document':145,182 'endpoint':28,46,124,210 'equal':75 'exampl':178 'expect':200 'experi':202 'fall':125 'field':185 'financ':128 'finance/web3':101 'financial data API' 'host':86 'howev':142 'id':39 'infer':100 'infrastructur':104 'investment performance' 'json':52 'json-response' 'key':115 'limit':118 'live':213 'lowpaymentfee.com':30,85 'maximum':67 'metric':135 'micropay':6,19 'minim':163 'network':9,22,59 'openapi':175 'page':158 'paramet':193 'particular':123 'pay':92 'pay-per-cal':91 'pay-per-request' 'payment':53 'paywal':44 'per':77,93,110 'perform':2,15,33,134,188 'portfolio':1,14,32,38,141,187 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48,195 'pre':139 'pre-defin':138 'price':107,155 'prompt':166 'provid':84,206 'rate':117 'request':49,78,111,146 'resolv':160 'respons':149,179,189 'return':31,51 'schema':147,150 'settl':55 'span':96 'spec':176 'specif':37 'unit':73 'usdc':13,26,61,79 'usdc-base' 'use':60,80 'util':105 'valid':216 'via':4,17,214 'wallet':165 'x402':5,18,43 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"ad7b73ce-eb3c-49bf-86cb-e68e9ca2ba25","listingId":"b736b2ce-9514-44d1-bcf0-3eb1be6e04fa","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/56/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":"2026-04-18T18:53:02.548Z"}],"sources":[{"listingId":"b736b2ce-9514-44d1-bcf0-3eb1be6e04fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/56/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:02.548Z","lastSeenAt":"2026-04-28T09:06:35.471Z"}],"details":{"listingId":"b736b2ce-9514-44d1-bcf0-3eb1be6e04fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/56/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/56/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, 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/56/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with micropayments","Developers who want keyless, pay-per-call financial data access on Base"],"notFor":["Users needing detailed API documentation or guaranteed SLA before integrating","Bulk historical portfolio data retrieval (no evidence of batch support)","Non-crypto-native consumers who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.372Z"},"updatedAt":"2026-04-28T09:06:35.471Z"}}