{"id":"1cff49b6-8f22-4825-a9f1-7bde2f5817a8","shortId":"dsgmbH","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base network for $0.02/request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 54. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/54/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). There are no API keys, no rate limits, and no signup required — callers simply attach an x402 payment header to each request. The x402 challenge is live and well-formed (version 1, scheme \"exact\").\n\nDocumentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further 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 appears to be part of a portfolio/finance domain, but without documentation the exact data returned is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","Base USDC micropayment API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint is hardcoded to portfolio ID 54; unclear if other portfolio IDs are supported","No examples of request body or response payload exist in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/54/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/54/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The purpose of this specific endpoint (portfolio 54 holdings) is only inferable from the URL path. Effectively a stub 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'/request':13,26 '0.02':12,25,112 '000':107 '0x8335':99 '1':149 '20':106 '2913':100 '54':37 '6':115 'Base USDC micropayment API' 'accept':82,201 'ai/ml':59 'amount':104 'analyt':58 'api':55,120,161 'appear':204 'attach':131 'base':9,22,74,97,108 'behind':67 'bodi':200 'broader':43 'call':54 'caller':129 'chain':93 'challeng':141 'connect':170 'contain':194 'content':176 'contract':98 'crypto portfolio data' 'data':4,17,33,57,217 'decim':116 'descript':187 'doc':160 'document':152,214 'domain':211 'endpoint':28,80,203 'equal':111 'exact':151,216 'exampl':184 'extrem':157 'field':190 'finance/web3':61 'form':147 'gate':66 'header':135 'hold':3,16,32,192 'id':36 'infer':60 'infrastructur':63 'investment holdings' 'json':87 'json-response' 'key':121 'limit':124 'live':143 'lowpaymentfee' 'lowpaymentfee.com':30,45 'maximum':103 'micropay':7,20 'network':10,23,75 'no-api-key' 'offer':47 'on-chain':91 'openapi':180 'page':165 'paramet':197 'part':40,207 'pay':52 'pay-per-cal':51 'pay-per-request' 'payment':70,88,134 'per':53 'platform':44 'portfolio':2,15,35 'portfolio holdings API' 'portfolio-holdings' 'portfolio/finance':210 'post':83,199 'price':162 'prompt':172 'protocol':71 'rate':123 'readm':164 'render':167 'request':84,138 'request/response':183 'requir':128 'respons':193 'retriev':1,14 'return':31,86,218 'schema':181 'scheme':150 'settl':90 'signup':127 'simpli':130 'site':155 'span':56 'spars':158 'specif':79 'unit':109 'unknown':220 'usdc':77,95,113 'usdc-base' 'use':76,114 'util':64 'varieti':49 'version':148 'via':5,18,94 'wallet':171 'well':146 'well-form':145 'without':213 'x402':6,19,69,133,140 'x402 finance API' 'x402-payment'","prices":[{"id":"852d1661-dd47-43ef-bee6-b3deb543ead9","listingId":"1cff49b6-8f22-4825-a9f1-7bde2f5817a8","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/54/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":"2026-04-18T18:53:00.753Z"}],"sources":[{"listingId":"1cff49b6-8f22-4825-a9f1-7bde2f5817a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/54/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:00.753Z","lastSeenAt":"2026-04-28T09:06:26.132Z"}],"details":{"listingId":"1cff49b6-8f22-4825-a9f1-7bde2f5817a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/54/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/54/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/holdings"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching holdings data for a specific portfolio via automated agent","Integrating portfolio position data into a trading dashboard","Programmatic access to portfolio composition without API key management"],"bestFor":["Agents that need on-demand portfolio holdings without signup","Developers experimenting with x402 micropayment-gated APIs","Automated workflows requiring pay-per-call finance data"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","Bulk data retrieval where per-request pricing would be cost-prohibitive","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.597Z"},"updatedAt":"2026-04-28T09:06:26.132Z"}}