{"id":"04717963-418f-43ac-af17-4279b058d5a2","shortId":"KfWNGw","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 92. It is part of a broader platform offering various paid API endpoints 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 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 on Base. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints. Documentation pages exist at /docs, /pricing, and /api but currently render only a wallet-connect prompt with no substantive content. No OpenAPI schema, request/response examples, or detailed field documentation were found. The specific structure of the holdings response (fields, pagination, filters) is unknown from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio positions","asset allocation endpoint","x402 finance API","crypto portfolio data","USDC micropayment API"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are unknown","All doc/pricing/API pages return only a wallet-connect prompt with no substantive content","The endpoint is hardcoded to portfolio ID 92; it is unclear whether other portfolio IDs are accessible or what this portfolio represents","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/92/holdings","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/92/holdings","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 schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of 'portfolio 92 holdings' is unexplained, making this effectively a stub 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'/docs':153 '/pricing':154 '/request':142 '0.02':10,22,112,141 '000':107 '20':106 '6':117 '92':36 'USDC micropayment API' 'accept':71 'across':49,145 'advertis':138 'ai/ml':52 'amount':101 'analyt':51 'api':47,122 'asset allocation endpoint' 'avail':194 'base':8,20,65,98,108 'base-network' 'broader':42 'call':104 'caller':85 'categori':56 'commit':130 'connect':164 'content':169 'crypto portfolio data' 'current':158 'data':3,15,32,50 'decim':118 'detail':176 'document':149,178 'endpoint':26,48,70,148 'exampl':174 'exist':151 'field':177,188 'filter':190 'finance/web3':53 'found':180 'handl':79 'header':91 'hold':2,14,31,186 'id':35 'includ':86 'independ':134 'infrastructur':55 'inlin':80 'investment holdings' 'json':76 'json-response' 'key':123 'limit':126 'lowpaymentfee.com':28 'materi':195 'maximum':100 'micropay':6,18 'model':144 'network':9,21,66 'no-api-key' 'offer':44 'openapi':171 'page':150 'pagin':189 'paid':46,135 'part':39 'payment':77,90,96 'per':11,23,103 'per-request-pricing' 'platform':43,137 'portfolio':1,13,30,34 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':72 'price':143 'prompt':165 'protocol':62,84 'rate':125 'render':159 'request':12,24,73,132 'request/response':173 'requir':102 'respons':187 'return':29,75 'schema':172 'settl':58 'sign':94 'sinc':114 'specif':182 'structur':183 'subscript':129 'substant':168 'uniform':140 'unit':109 'unknown':192 'usd':113 'usdc':68,95,111,115 'usdc-settlement' 'use':67,116 'various':45 'via':4,16,59,81 'wallet':163 'wallet-connect':162 'x':89 'x-payment':88 'x402':5,17,61,83 'x402 finance API' 'x402-payment'","prices":[{"id":"25182b7b-20df-4ed8-a6b7-8dc1e530a38c","listingId":"04717963-418f-43ac-af17-4279b058d5a2","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/92/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:39.285Z"}],"sources":[{"listingId":"04717963-418f-43ac-af17-4279b058d5a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/92/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:39.285Z","lastSeenAt":"2026-04-27T14:05:19.412Z"}],"details":{"listingId":"04717963-418f-43ac-af17-4279b058d5a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/92/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/92/holdings"},{"claim":"Platform advertises $0.02/request uniform pricing, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/92/holdings"}],"useCases":["Retrieve current holdings for a specific portfolio via a single micropayment","Integrate portfolio data into dashboards or trading bots without subscription overhead","Agent-driven portfolio monitoring with pay-per-call economics"],"bestFor":["Developers wanting frictionless, keyless access to portfolio holdings data","AI agents that need on-demand financial data with crypto micropayments","Low-volume or sporadic consumers who prefer pay-per-request over subscriptions"],"notFor":["High-frequency consumers needing bulk or streaming portfolio data at lower marginal cost","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing detailed API documentation or guaranteed SLA before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.707Z"},"updatedAt":"2026-04-27T14:05:19.412Z"}}