{"id":"4b12862c-da87-4a3a-8748-b7751d209c46","shortId":"67EeEB","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 51. 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/51/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). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout window.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or example payloads. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. Because of this, the exact request body format and response structure for the holdings endpoint are unknown and must be discovered experimentally.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio positions","asset allocation endpoint","holdings data","crypto portfolio API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","Request body schema and response format are completely unknown; no OpenAPI spec or examples provided","The endpoint is scoped to a single hardcoded portfolio ID (51) with no explanation of what this portfolio represents","The broader platform lists many endpoints but none have documented schemas — treat all with caution"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/51/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/51/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no request/response schema, no examples, and the docs pages are empty. The purpose of 'portfolio 51 holdings' is opaque — it's unclear whether this returns real financial data or placeholder 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'0.02':11,24,70,122 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':111 '20':105 '2913':112 '300':138 '51':37 '6':118 'accept':87 'addit':180 'address':134 'ai/ml':59 'analyt':58 'api':54,166 'asset allocation endpoint' 'avail':150 'base':9,22,81,107,114 'bodi':188 'broader':43 'call':53,124 'challeng':95 'confirm':96 'connect':175 'content':181 'crypto portfolio API' 'data':4,17,33,57,63 'decim':119 'descript':160 'discov':202 'doc':165 'document':142 'dozen':48 'endpoint':28,55,85,151,196 'equal':121 'exact':131,186 'exampl':162 'experiment':203 'extrem':144 'finance/web3':61 'format':189 'hold':3,16,32,195 'holdings data' 'id':36 'infer':60 'infrastructur':65 'investment holdings' 'json':92 'json-api' 'land':147 'list':149 'live':99 'lowpaymentfee' 'lowpaymentfee.com':30,45 'made':127 'market':62 'maximum':102 'micropay':7,20 'must':200 'network':82 'offer':47 'page':148,170 'paramet':159 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'payload':163 'payment':103,125 'per':12,25,52,71,123 'platform':44 'portfolio':2,15,35 'portfolio holdings API' 'portfolio positions' 'portfolio-holdings' 'post':88 'post-method' 'price':68,153,167 'prompt':177 'provid':155 'readm':169 'render':172 'request':13,26,72,89,187 'request/response':157 'requir':100 'respons':191 'retriev':1,14 'return':31,91 'schema':158 'scheme':132 'second':139 'settl':74 'sinc':115 'span':56 'spars':145 'specif':84 'structur':192 'timeout':140 'unit':108 'unknown':198 'usdc':78,110,116 'usdc-base' 'use':77,117 'util':66 'via':5,18,75,128 'wallet':176 'window':141 'x402':6,19,76,94,130 'x402-payment'","prices":[{"id":"a8a2a376-7274-4549-b86a-f5956e522f5c","listingId":"4b12862c-da87-4a3a-8748-b7751d209c46","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/51/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":"2026-04-18T18:52:51.839Z"}],"sources":[{"listingId":"4b12862c-da87-4a3a-8748-b7751d209c46","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/51/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:51.839Z","lastSeenAt":"2026-04-27T22:33:21.044Z"}],"details":{"listingId":"4b12862c-da87-4a3a-8748-b7751d209c46","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/51/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/51/holdings"},{"claim":"The platform advertises $0.02 per request across all endpoints 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/51/holdings"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current holdings for a specific portfolio to display in a dashboard","Programmatic portfolio monitoring by AI agents that can pay per call","Integrating portfolio data into automated trading or rebalancing workflows"],"bestFor":["Agents or apps needing on-demand portfolio holdings without API key management","Micropayment-native workflows on Base that want sub-dollar per-call pricing","Developers prototyping portfolio tools who want instant access with no signup"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-frequency polling use cases where $0.02 per call adds up quickly","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 51)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.053Z"},"updatedAt":"2026-04-27T22:33:21.044Z"}}