{"id":"3ade6076-fcd3-469f-aa93-983e30da2cf0","shortId":"qYpw3x","kind":"x402","title":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02/request.","tagline":"Retrieve portfolio holdings data via x402 micropayment on Base for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 56. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all priced at $0.02 per request and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/56/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), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint path suggests it returns a list of asset holdings for a specific portfolio, but the exact schema of the request body and response payload is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-call","json-api"],"categories":["finance"],"synonyms":["portfolio holdings","investment holdings","asset allocation","portfolio positions","holdings API","portfolio data"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.","No OpenAPI or request/response schema provided; request body format and response structure are completely unknown.","Endpoint is hardcoded to portfolio ID 56; unclear if other portfolio IDs are accessible or what data this portfolio represents.","The broader platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/56/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/56/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 the endpoint is scoped to a single hardcoded portfolio ID. The crawled pages beyond the landing page are empty. Effectively a stub 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'/request':12,24 '0.02':11,23,66,113 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':124 '0x8335':107 '20':101 '2913':108 '300':127 '56':35 '6':117 'accept':83 'access':138 'across':54 'addit':168 'address':123 'advertis':137 'ai/ml':57 'analyt':56 'api':52,131,154 'asset':193 'asset allocation' 'base':9,21,77,103,110 'bodi':206 'broader':41 'call':51 'categori':62 'challeng':91 'confirm':92 'connect':163 'content':169 'crawl':152 'data':4,16,31,55 'decim':118 'descript':176 'doc':153 'document':147 'dozen':46 'endpoint':26,53,81,185 'equal':112 'exact':201 'exampl':182 'extrem':149 'finance/web3':59 'gate':140 'given':114 'header':146 'hold':3,15,30,194 'holdings API' 'id':34 'infer':58 'infrastructur':61 'investment holdings' 'json':88 'json-api' 'key':132 'limit':135 'list':191 'live':95 'lowpaymentfee.com':28,43 'made':121 'maximum':98 'micropay':7,19 'network':78 'offer':45 'openapi':173 'page':158 'paramet':179 'part':38 'path':186 'pay':49 'pay-per-cal':48 'pay-per-call' 'payload':209 'payment':99,119,145 'per':50,67 'platform':42 'portfolio':2,14,33,198 'portfolio data' 'portfolio holdings' 'portfolio positions' 'portfolio-holdings' 'post':84 'price':64,155 'prompt':165 'pure':141 'rate':134 'readm':157 'render':160 'request':68,85,178,205 'requir':96 'respons':183,208 'retriev':1,13 'return':29,87,189 'schema':174,202 'second':128 'settl':70 'spars':150 'specif':80,197 'suggest':187 'timeout':129 'unit':104 'unknown':211 'usdc':74,106,115 'usdc-base' 'use':73 'via':5,17,71 'wallet':164 'x402':6,18,72,90,144 'x402-payment'","prices":[{"id":"fd11d805-9792-466d-9029-6694ef42d187","listingId":"3ade6076-fcd3-469f-aa93-983e30da2cf0","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/56/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":"2026-04-18T18:53:01.952Z"}],"sources":[{"listingId":"3ade6076-fcd3-469f-aa93-983e30da2cf0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/56/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:01.952Z","lastSeenAt":"2026-04-28T09:06:35.389Z"}],"details":{"listingId":"3ade6076-fcd3-469f-aa93-983e30da2cf0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/56/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 HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/portfolios/56/holdings"},{"claim":"The platform advertises $0.02/request pricing 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/56/holdings"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio position data into dashboards or analytics tools","Automated portfolio monitoring by AI agents"],"bestFor":["Agents needing on-demand portfolio holdings without API key management","Micropayment-gated access to financial data","Quick integration with no signup or rate limits"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","Querying arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 56)","High-volume batch retrieval where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.484Z"},"updatedAt":"2026-04-28T09:06:35.389Z"}}