{"id":"32478bf0-8aee-4e5f-8cfc-188f29eb938e","shortId":"qQ6Sbv","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 61. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/61/holdings` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the payTo address. No API keys, rate limits, or upfront commitments are required — access is instant upon payment.\n\nDocumentation on the site is extremely thin: 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. The endpoint path suggests it returns financial portfolio holdings, but the exact schema and semantics are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","Base USDC API","micropayment portfolio data","lowpaymentfee","crypto portfolio endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; the structure of the holdings response is unknown","Endpoint is specific to portfolio ID 61; it is unclear whether other portfolio IDs are accessible or what portfolio 61 represents","The broader lowpaymentfee.com platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/61/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/61/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, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data the holdings endpoint actually returns. The site's docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'0.02':11,24,70,119 '000':106 '0x8335':111 '20':105 '2913':112 '6':115 '61':37 'Base USDC API' 'accept':87 'access':142 'address':131 'ai/ml':59 'analyt':58 'api':54,133,156 'base':9,22,81,107,114 'broader':43 'call':53 'challeng':95 'commit':139 'confirm':96 'connect':165 'contain':189 'content':171 'crypto portfolio endpoint' 'data':4,17,33,57,63 'decim':116 'descript':182 'doc':155 'document':147 'dozen':48 'endpoint':28,55,85,191 'equal':118 'exact':126,201 'exampl':179 'extrem':152 'field':185 'finance/web3':61 'financi':196 'hold':3,16,32,187,198 'id':36 'infer':60 'infrastructur':65 'instant':144 'investment holdings' 'json':92 'key':134 'limit':136 'live':99 'lowpaymentfee' 'lowpaymentfee.com':30,45 'made':122 'market':62 'maximum':102 'micropay':7,20 'micropayment portfolio data' 'network':82 'no-api-key' 'offer':47 'openapi':175 'page':160 'part':40 'path':192 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':103,120,146 'payto':130 'per':12,25,52,71 'platform':44 'portfolio':2,15,35,197 'portfolio holdings API' 'portfolio-holdings' 'post':88 'price':68,157 'prompt':167 'rate':135 'readm':159 'render':162 'request':13,26,72,89 'request/response':178 'requir':100,141 'respons':188 'retriev':1,14 'return':31,91,195 'schema':176,202 'scheme':127 'semant':204 'settl':74 'site':150 'span':56 'specif':84 'suggest':193 'thin':153 'unit':108 'unknown':206 'upfront':138 'upon':145 'usdc':78,110 'usdc-base' 'use':77 'util':66 'via':5,18,75,123 'wallet':166 'x402':6,19,76,94,125 'x402 finance API' 'x402-payment'","prices":[{"id":"25675bac-b5a7-4bdf-b8ff-f183b12677c3","listingId":"32478bf0-8aee-4e5f-8cfc-188f29eb938e","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/61/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":"2026-04-18T18:53:10.325Z"}],"sources":[{"listingId":"32478bf0-8aee-4e5f-8cfc-188f29eb938e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/61/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:10.325Z","lastSeenAt":"2026-04-27T20:08:58.464Z"}],"details":{"listingId":"32478bf0-8aee-4e5f-8cfc-188f29eb938e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/61/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 x402 challenge requiring 20,000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/61/holdings"},{"claim":"The platform advertises $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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/61/holdings"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching holdings data for a specific portfolio via automated agent","Integrating portfolio position data into a financial dashboard without API key management","Paying per-call for portfolio data using USDC on Base"],"bestFor":["Agents or bots that need on-demand portfolio holdings without subscription overhead","Developers experimenting with x402 payment-gated APIs","Low-volume consumers who want pay-as-you-go financial data"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 61)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.037Z"},"updatedAt":"2026-04-27T20:08:58.464Z"}}