{"id":"b4500836-e341-444e-8bd0-99f59b53fbb7","shortId":"PNRSBh","kind":"x402","title":"Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.","tagline":"Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 55) via a POST request. It uses the x402 payment protocol, requiring a per-request micropayment of $0.02 in USDC on the Base network. No API keys or rate limits are imposed; access is granted instantly upon payment.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers various pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per request. The specific endpoint `/api/v1/portfolios/55/holdings` appears to serve financial portfolio holdings data, though detailed documentation on the request body schema or response format is not available from the crawled material.\n\nPayment is settled on-chain using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base L2 network. The x402 challenge specifies a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["portfolio data","holdings API","investment holdings","crypto portfolio","financial data API","x402 API","micropayment API"],"warnings":["No request body schema or response schema documented","Documentation pages return only 'Connect wallet' with no actual content","The specific portfolio (ID 55) purpose and data contents are unknown","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/55/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/55/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 confirmed) and pricing is clear, but there is no documentation on request/response schemas, no OpenAPI spec, and the crawled docs pages are empty ('Connect wallet' only). The specific purpose of portfolio 55 holdings is 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'0.02':63,114,173 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':183 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':155 '20000':168 '300':188 '55':45 '6':176 'access':38,78 'address':181 'ai/ml':104 'analyt':103 'api':7,23,71,100 'appear':121 'avail':141 'base':9,25,68,158,169 'base-network' 'bodi':134 'broader':90 'call':4,20,99 'chain':151 'challeng':163 'contract':154 'crawl':144 'crypto portfolio' 'data':42,102,107,127 'decim':177 'detail':129 'document':130 'endpoint':34,85,119 'equal':172 'finance/web3':106 'financi':124 'financial data API' 'format':138 'grant':80 'hold':6,22,41,126 'holdings API' 'id':44 'impos':77 'infer':105 'infrastructur':109 'instant':81 'investment holdings' 'key':72 'l2':159 'limit':75 'lowpaymentfee.com':36,92 'materi':145 'maxamountrequir':166 'micropay':61 'micropayment API' 'network':10,26,69,160 'no-api-key' 'no-rate-limit' 'offer':94 'on-chain':149 'part':87 'pay':2,18,97 'pay-per-cal':1,17,96 'pay-per-call' 'payment':54,83,146,179 'per':3,19,59,98,115 'per-request':58 'platform':91 'portfolio':5,21,40,43,125 'portfolio data' 'portfolio-holdings' 'post':48 'price':112 'protocol':13,29,55 'provid':37 'rate':74 'recipi':180 'request':49,60,116,133 'requir':56 'respons':137 'schema':135 'second':189 'serv':123 'settl':14,30,148 'span':101 'specif':118 'specifi':164 'though':128 'timeout':186 'unit':170 'upon':82 'usdc':16,32,65,153,174 'usdc-settlement' 'use':51,152,175 'util':110 'various':95 'via':11,27,46 'x402':12,28,53,162 'x402 API' 'x402-payment'","prices":[{"id":"ec96c1e0-7dfb-4354-9f15-842990254037","listingId":"b4500836-e341-444e-8bd0-99f59b53fbb7","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/55/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":"2026-04-18T18:53:07.329Z"}],"sources":[{"listingId":"b4500836-e341-444e-8bd0-99f59b53fbb7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/55/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:07.329Z","lastSeenAt":"2026-04-27T21:34:10.246Z"}],"details":{"listingId":"b4500836-e341-444e-8bd0-99f59b53fbb7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/55/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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/55/holdings"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/55/holdings"}],"useCases":["Retrieving portfolio holdings data for portfolio #55 programmatically","Building automated portfolio tracking dashboards","Integrating holdings data into trading bots or analytics pipelines"],"bestFor":["Agents needing on-demand portfolio holdings without subscription commitments","Developers wanting keyless API access with crypto micropayments","Applications requiring low-friction financial data access on Base network"],"notFor":["Users who need bulk/batch portfolio data at scale (pay-per-call may add up)","Those without USDC on Base network for payment","Users needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.258Z"},"updatedAt":"2026-04-27T21:34:10.246Z"}}