{"id":"cf515d97-eee9-4f45-b88c-830ee611ecbf","shortId":"saRTUU","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 provides access to portfolio holdings data (specifically portfolio ID 44) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02).\n\nThe provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under the finance/portfolio category, though the site does not provide detailed documentation for this particular route. The x402 challenge is live and well-formed, confirming the endpoint is operational.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the exact request body format and response structure for this holdings endpoint are unknown. Agents should expect a JSON response containing portfolio holdings information, but the specific fields and any required POST body parameters remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","asset allocation","holdings endpoint","x402 finance API","crypto portfolio"],"warnings":["No API documentation available — request body format and response schema are unknown","Endpoint is hardcoded to portfolio ID 44; unclear if other portfolio IDs are accessible","Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content","No OpenAPI or schema definition provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/44/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/44/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation for this specific endpoint. The endpoint is scoped to a single portfolio ID (44) with no explanation of what data it returns. Effectively a stub 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'000':69 '20':68 '44':40 '6':73 'accept':47 'access':32 'agent':180 'ai/ml':92 'analyt':91 'api':88,107 'asset allocation' 'base':9,22,60,70 'beyond':161 'bodi':169,198 'broad':81 'call':65,87 'catalog':82 'categori':122 'challeng':137 'commit':114 'confirm':144 'contain':186 'crypto portfolio' 'data':4,17,36,90,95 'decim':74 'detail':129 'document':130,160 'endpoint':28,117,146,177 'exact':167 'exampl':157 'expect':182 'fall':118 'field':193 'finance/portfolio':121 'finance/web3':94 'form':143 'format':170 'hold':3,16,35,176,188 'holdings endpoint' 'host':79 'id':39 'infer':93 'inform':189 'infrastructur':97 'investment holdings' 'json':52,184 'json-response' 'key':108 'land':163 'limit':111 'list':165 'live':139 'lowpaymentfee.com':30,78 'maxamountrequir':66 'micropay':7,20 'network':61 'no-api-key' 'openapi':153 'oper':148 'page':164 'paramet':199 'particular':133 'pay':85 'pay-per-cal':84 'pay-per-request' 'payment':44,53 'per':12,25,64,86,103 'portfolio':2,15,34,38,187 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':48,197 'price':100 'protocol':45 'provid':31,77,128 'rate':110 'remain':200 'request':13,26,49,104,168 'request/response':156 'requir':196 'respons':172,185 'retriev':1,14 'return':51 'rout':134 'schema':154 'settl':55 'site':125 'span':89 'specif':37,116,192 'structur':173 'though':123 'undocu':201 'unit':71 'unknown':179 'usdc':57 'usdc-base' 'util':98 'via':5,18 'well':142 'well-form':141 'x402':6,19,43,136 'x402 finance API' 'x402-payment'","prices":[{"id":"93f6456c-828b-41ef-a4cd-3e2193f89545","listingId":"cf515d97-eee9-4f45-b88c-830ee611ecbf","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/44/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":"2026-04-18T18:52:48.885Z"}],"sources":[{"listingId":"cf515d97-eee9-4f45-b88c-830ee611ecbf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/44/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:48.885Z","lastSeenAt":"2026-04-27T22:33:20.970Z"}],"details":{"listingId":"cf515d97-eee9-4f45-b88c-830ee611ecbf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/44/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 x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/44/holdings"},{"claim":"All APIs on lowpaymentfee.com are 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 contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base uses 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings for a specific portfolio","Integrating portfolio data into dashboards or analytics tools","Automated portfolio monitoring by AI agents","Retrieving asset allocation breakdowns"],"bestFor":["Agents needing on-demand portfolio holdings without subscription","Developers wanting keyless, pay-per-call finance data","Low-volume or sporadic portfolio data lookups"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing detailed API documentation or schema validation before integration","Querying arbitrary portfolio IDs (this endpoint is scoped to portfolio 44)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.167Z"},"updatedAt":"2026-04-27T22:33:20.970Z"}}