{"id":"396a0e4b-314a-4c3d-99b0-1ed6201040ed","shortId":"KTWGJD","kind":"x402","title":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","tagline":"Pay-per-call portfolio holdings API on Base, settled in USDC via x402.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for a given portfolio ID (in this case, portfolio 100). It is part of a broader suite of pay-per-request APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/100/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). The site's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — 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 or what parameters the POST body accepts. The endpoint is live (returns a valid 402 challenge), but without documentation it is difficult to know what data to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","crypto portfolio","holdings endpoint","x402 finance API","USDC micropayment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request body format and response structure are unknown","The endpoint path is hardcoded to portfolio ID 100; it is unclear whether other portfolio IDs are supported or how they are created","The broader site lists many endpoint categories (AI, analytics, finance, utilities) all at $0.02, but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/100/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/100/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 and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the holdings data actually contains. Effectively a stub 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'/request':133 '0.02':117,132 '000':106 '0x8335':111 '100':46 '20':105 '2913':112 '402':205 '6':122 'USDC micropayment API' 'accept':91,197 'across':136 'advertis':100 'ai/ml':66 'analyt':65 'api':7,21,59,141,157 'back':223 'base':9,23,85,107,114 'base-network' 'bodi':196 'broader':52 'call':4,18 'case':44 'challeng':99,206 'commit':149 'confirm':129 'connect':166 'contain':190 'content':172 'cost':103 'crypto':69 'crypto portfolio' 'data':36,64,216 'decim':123 'descript':183 'difficult':212 'doc':156 'document':151,209 'endpoint':30,74,89,138,199 'equal':116 'exampl':180 'expect':222 'extrem':153 'field':186 'financ':68 'flat':131 'given':39 'hold':6,20,35,188 'holdings endpoint' 'id':41 'infer':67 'investment holdings' 'json':96 'json-response' 'key':142 'know':214 'land':127 'limit':145 'live':201 'lowpaymentfee.com':32,62 'maximum':102 'minimum':148 'model':135 'network':86 'no-api-key' 'offer':60 'openapi':176 'page':128,161 'paramet':193 'part':49 'pay':2,16,56 'pay-per-cal':1,15 'pay-per-request':55 'payment':78 'per':3,17,57,118 'portfolio':5,19,34,40,45 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':92,195 'price':134,158 'prompt':168 'protocol':79 'rate':144 'readm':160 'render':163 'request':58,93,119 'request/response':179 'requir':150 'respons':189 'return':33,95,202 'schema':177 'send':218 'servic':72 'settl':10,24,80 'site':125 'span':63 'spars':154 'specif':88 'substant':171 'suit':53 'unit':108 'usdc':12,26,82,110,120 'usdc-settlement' 'use':75,121 'util':71 'valid':204 'via':13,27 'wallet':167 'without':208 'x402':14,28,77,98 'x402 finance API' 'x402-payment'","prices":[{"id":"988ec021-c36e-4b56-b9c1-a80c924b8ffe","listingId":"396a0e4b-314a-4c3d-99b0-1ed6201040ed","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/100/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":"2026-04-18T18:52:20.038Z"}],"sources":[{"listingId":"396a0e4b-314a-4c3d-99b0-1ed6201040ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/100/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:20.038Z","lastSeenAt":"2026-04-28T05:34:35.155Z"}],"details":{"listingId":"396a0e4b-314a-4c3d-99b0-1ed6201040ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/100/holdings \\\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":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/100/holdings"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/100/holdings"}],"useCases":["Retrieving current holdings for a specific portfolio","Building portfolio tracking dashboards that pay per query","Agent-driven portfolio analysis without API key management"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle USDC payments on Base automatically","Prototyping portfolio tools without subscription commitments"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.502Z"},"updatedAt":"2026-04-28T05:34:35.155Z"}}