{"id":"aa4ea68c-550b-4cc6-8b11-48e6e2c4cc24","shortId":"DHy87t","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 81. 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 data, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/81/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted per-request upon valid x402 payment. The x402 challenge was confirmed live, returning a well-formed 402 response with version 1 of the protocol.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint's purpose (portfolio holdings) is inferred solely from the URL path and the generic \"Premium API Access\" description. The actual request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","Base USDC API","lowpaymentfee","micropayment API","portfolio data"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are completely unknown","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no technical content","The endpoint path references a specific portfolio ID (81); it is unclear whether other portfolio IDs are accessible or what this portfolio represents","The platform lists many endpoints but provides no verifiable evidence of what data they actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/81/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/81/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, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual data returned is entirely unknown; even the endpoint's purpose is inferred only from the URL 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'/api/v1/portfolios/81/holdings':82 '/docs':164 '/pricing':166 '/readme':168 '/request':13,26 '0.02':12,25,113 '000':108 '0x8335':100 '1':151 '20':107 '2913':101 '402':147 '6':116 '81':37 'Base USDC API' 'accept':83 'access':126,214 'actual':217 'advertis':125 'ai/ml':59 'analyt':58 'api':54,119,213 'avail':195 'base':9,22,75,98,109 'behind':68 'beyond':156 'bodi':219 'broader':43 'call':53 'chain':94 'challeng':138 'confirm':140 'connect':174 'contract':99 'cost':105 'data':4,17,33,57,62 'decim':117 'descript':215 'detail':181 'document':155,190 'dozen':48 'endpoint':28,55,81,197 'equal':112 'exampl':193 'extrem':161 'finance/web3':61 'form':146 'format':220 'gate':67 'generic':211 'grant':128 'hold':3,16,32,201 'id':36 'infer':60,203 'investment holdings' 'json':88 'json-api' 'key':120 'land':158 'limit':123 'live':141 'lowpaymentfee' 'lowpaymentfee.com':30,45 'maximum':104 'micropay':7,20 'micropayment API' 'network':10,23,76 'no-api-key' 'offer':47 'on-chain':92 'openapi':185 'page':159,169 'part':40 'path':208 'pay':51 'pay-per-cal':50 'pay-per-request' 'payload':194 'payment':71,89,135 'per':52,130 'per-request':129 'platform':44 'portfolio':2,15,35,200 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':84 'premium':212 'prompt':176 'protocol':72,154 'purpos':199 'rate':122 'render':171 'request':85,131,218 'request/response':188 'respons':148,222 'retriev':1,14 'return':31,87,142 'schema':189 'servic':65 'settl':91 'sole':204 'span':56 'spec':186 'specif':80 'structur':223 'technic':180 'thin':162 'unit':110 'unknown':225 'upon':132 'url':207 'usdc':78,96,114 'usdc-base' 'use':77,115 'util':64 'valid':133 'version':150 'via':5,18,95 'wallet':175 'well':145 'well-form':144 'x402':6,19,70,134,137 'x402 finance API' 'x402-payment'","prices":[{"id":"2a834df7-c136-471e-b852-7d34fa13067b","listingId":"aa4ea68c-550b-4cc6-8b11-48e6e2c4cc24","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/81/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":"2026-04-18T18:53:27.865Z"}],"sources":[{"listingId":"aa4ea68c-550b-4cc6-8b11-48e6e2c4cc24","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/81/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:27.865Z","lastSeenAt":"2026-04-27T17:05:05.114Z"}],"details":{"listingId":"aa4ea68c-550b-4cc6-8b11-48e6e2c4cc24","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/81/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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/81/holdings"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/81/holdings"}],"useCases":["Fetching holdings data for a specific portfolio via automated agent","Integrating portfolio position data into a trading or analytics dashboard","Programmatic access to portfolio composition without traditional API key management"],"bestFor":["Agents that need on-demand portfolio holdings data with crypto micropayments","Developers experimenting with x402 pay-per-call APIs on Base","Use cases where avoiding API key registration is preferred"],"notFor":["Users who need detailed API documentation or guaranteed SLA before integrating","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":"2026-02-17T23:13:58.255Z"},"updatedAt":"2026-04-27T17:05:05.114Z"}}