{"id":"88df7619-3a76-4e21-ab53-e99a66382f49","shortId":"69SbN4","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","tagline":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 33. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/33/holdings` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header per the x402 protocol. The payment timeout is 300 seconds.\n\nDocumentation on the platform is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The endpoint is live (returns a proper 402 challenge), but the actual data returned after payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API","Base USDC API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only a wallet connect prompt","No OpenAPI or request/response schema provided; response format is completely unknown","Endpoint is scoped to a single portfolio ID (33); unclear if other portfolio IDs are available","Platform appears to be a generic demo or early-stage project with many listed endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/33/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/33/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data the holdings endpoint actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/portfolios/33/holdings':81 '/docs':160 '/pricing':162 '/readme':164 '/request':12,24 '0.02':11,23,108 '000':97 '0x8335':102 '20':96 '2913':103 '300':141 '33':36 '402':202 '6':113 'Base USDC API' 'accept':82 'actual':206 'advertis':91 'ai/ml':54 'analyt':53 'api':50,116 'avail':154,214 'base':8,20,76,98,105 'broader':42 'challeng':90,203 'connect':170 'contain':194 'content':176 'cost':94 'crypto':57 'crypto portfolio' 'data':3,15,32,52,207 'decim':114 'descript':187 'document':143 'endpoint':26,62,80,155,196 'equal':107 'exampl':184 'extrem':148 'field':190 'financ':56 'handl':125 'header':132 'hold':2,14,31,192 'holdings endpoint' 'id':35 'infer':55 'inlin':126 'investment holdings' 'json':87 'json-api' 'key':117 'land':151 'limit':120 'list':153 'live':198 'lowpaymentfee.com':28 'materi':215 'maximum':93 'micropay':6,18 'network':9,21,77 'no-api-key' 'offer':44 'openapi':180 'page':152,165 'part':39 'pay':47 'pay-per-request':46 'payment':69,123,131,138,210 'per':48,109,133 'platform':43,65,146 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':83 'price':157 'prompt':172 'proper':201 'protocol':70,136 'rate':119 'render':167 'request':49,84,110 'request/response':183 'requir':122 'respons':193 'return':29,86,199,208 'schema':181 'second':142 'servic':60 'settl':71 'span':51 'spars':149 'specif':79 'substant':175 'timeout':139 'unit':99 'unknown':212 'usdc':73,101,111 'usdc-base' 'use':66,112 'util':59 'various':45 'via':4,16,127 'wallet':171 'x':130 'x-payment':129 'x402':5,17,68,89,135 'x402 finance API' 'x402-payment'","prices":[{"id":"4674a6da-ddae-4e6f-a612-fc4bccf15864","listingId":"88df7619-3a76-4e21-ab53-e99a66382f49","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/33/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":"2026-04-18T18:52:42.922Z"}],"sources":[{"listingId":"88df7619-3a76-4e21-ab53-e99a66382f49","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/33/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:42.922Z","lastSeenAt":"2026-04-27T22:33:20.725Z"}],"details":{"listingId":"88df7619-3a76-4e21-ab53-e99a66382f49","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/33/holdings \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/33/holdings"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/33/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio via micropayment","Integrate portfolio data into trading bots or dashboards without API key management","Pay-per-call access to financial portfolio information on Base network"],"bestFor":["Agents needing on-demand portfolio holdings without subscription commitments","Developers prototyping financial dashboards with instant API access","x402-compatible clients on the Base network"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","Bulk data retrieval where per-request pricing becomes expensive","Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 33)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.451Z"},"updatedAt":"2026-04-27T22:33:20.725Z"}}