{"id":"579f99f5-2051-4d31-a062-1f3a9d99ba7e","shortId":"dLdty4","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 #57 via an x402-gated POST request. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments to a specified wallet address. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is granted per-request upon payment. The response MIME type is application/json.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response body documentation, and no description of what \"holdings\" data actually contains. The endpoint path suggests it returns asset holdings for a specific portfolio (ID 57), but the exact fields, request body format, and response structure are unknown.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","per-request-micropayment","json-response"],"categories":["finance"],"synonyms":["portfolio holdings","investment holdings","asset allocation","portfolio data","holdings API","crypto portfolio","financial holdings"],"warnings":["No API documentation available — docs, pricing, and API pages all render only a wallet-connect prompt","No request body schema or response schema documented","Endpoint is hardcoded to portfolio ID 57 with no explanation of what this portfolio represents","No OpenAPI or machine-readable spec provided","The broader platform lists many API categories but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/57/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/57/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty. The specific purpose of portfolio 57 holdings is 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'0.02':12,25,64,111 '000':100 '0x8335':105 '20':99 '2913':106 '57':36,192 '6':115 'accept':84 'access':125 'actual':177 'address':93 'advertis':124 'ai/ml':54 'amount':96 'analyt':53 'api':60,118,148 'application/json':138 'asset':185 'asset allocation' 'base':9,22,73,101,108 'bodi':168,198 'broader':49 'challeng':77 'confirm':78 'connect':154 'contain':178 'content':160 'crawl':144 'crypto portfolio' 'data':4,17,33,52,176 'decim':116 'descript':172 'doc':145 'document':139,169 'endpoint':28,80,180 'equal':110 'exact':86,195 'exact-schem':85 'extrem':141 'field':196 'finance/web3':56 'financial holdings' 'format':199 'gate':41 'given':112 'grant':127 'hold':3,16,32,175,186 'holdings API' 'id':191 'infer':55 'infrastructur':58 'investment holdings' 'json-response' 'key':119 'limit':122 'live':82 'lowpaymentfee.com':30 'max':95 'micropay':7,20 'mime':135 'network':10,23,74 'offer':51 'openapi':164 'page':149 'part':46 'path':181 'payment':88,132 'per':65,129 'per-request':128 'per-request-micropayment' 'platform':50 'portfolio':2,15,35,190 'portfolio data' 'portfolio holdings' 'portfolio-holdings' 'post':42 'price':62,146 'prompt':156 'rate':121 'render':151 'request':43,66,130,197 'request/response':167 'requir':97 'respons':134,201 'retriev':1,14 'return':31,184 'schema':165 'scheme':87 'settl':68 'spars':142 'specif':189 'specifi':91 'structur':202 'suggest':182 'type':136 'unit':102 'unknown':204 'upon':131 'usdc':70,104,113 'usdc-base' 'util':59 'via':5,18,37 'wallet':92,155 'x402':6,19,40,76 'x402-gated':39 'x402-payment'","prices":[{"id":"68f04193-8373-4ee6-9e34-13269984d7bd","listingId":"579f99f5-2051-4d31-a062-1f3a9d99ba7e","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/57/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":"2026-04-18T18:53:03.771Z"}],"sources":[{"listingId":"579f99f5-2051-4d31-a062-1f3a9d99ba7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/57/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:03.771Z","lastSeenAt":"2026-04-28T07:34:41.496Z"}],"details":{"listingId":"579f99f5-2051-4d31-a062-1f3a9d99ba7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/57/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 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/57/holdings"},{"claim":"All APIs priced at $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/57/holdings"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or analytics tools","Automated portfolio monitoring by AI agents"],"bestFor":["Developers needing on-demand portfolio holdings data without API key management","AI agents that can settle x402 micropayments on Base","Quick one-off lookups of portfolio composition"],"notFor":["Users who need detailed API documentation before integrating","Bulk or high-frequency data retrieval where per-request fees add up","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 57)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.484Z"},"updatedAt":"2026-04-28T07:34:41.496Z"}}