{"id":"81678bee-ffdb-47f2-b952-c5fd1a2b3a71","shortId":"AjjMXS","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 66. It is part of a broader platform offering various data, AI, finance, and utility APIs, all gated behind x402 micropayments settled in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe endpoint accepts POST requests and returns JSON. The x402 challenge is live and well-formed, advertising exact-scheme payment to a specified wallet address with a 300-second timeout. No API keys or rate limits are required — access is granted purely through per-call payment.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a \"Connect wallet\" stub with no meaningful content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the holdings response actually contains. The endpoint path suggests it returns financial portfolio holdings, but the exact fields and structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","per-request-micropayment","json-api"],"categories":["finance","data"],"synonyms":["portfolio holdings","investment holdings","portfolio data","financial portfolio API","holdings endpoint","x402 finance API","crypto portfolio"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' stub","No request or response schema provided; the structure of holdings data is unknown","This specific endpoint (portfolios/66/holdings) is not listed on the provider's landing page — it may be a demo or test portfolio","The platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/66/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/66/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). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific endpoint (portfolios/66/holdings) is not even mentioned on the site's landing page, making its purpose inferrable only from the URL path. Effectively a stub 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'/docs':132 '/pricing':133 '/readme':136 '0.02':11,24,68 '000':70 '20':69 '300':107 '6':76 '66':37 'accept':80 'access':118 'actual':166 'address':104 'advertis':95 'ai':48 'api':52,111 'base':9,22,63,71 'behind':55 'broader':43 'call':125 'challeng':88 'connect':142 'contain':167 'content':148 'cost':67 'crypto portfolio' 'data':4,17,33,47 'decim':77 'document':127,157 'endpoint':28,79,169 'exact':97,179 'exact-schem':96 'exampl':160 'extrem':129 'field':180 'financ':49 'financi':174 'financial portfolio API' 'form':94 'gate':54 'grant':120 'hold':3,16,32,164,176 'holdings endpoint' 'id':36 'investment holdings' 'json':85 'json-api' 'key':112 'limit':115 'live':90 'lowpaymentfee.com':30 'meaning':147 'micropay':7,20,57 'network':64 'offer':45 'openapi':152 'page':137 'part':40 'path':170 'payment':99,126 'per':12,25,124 'per-cal':123 'per-request-micropayment' 'platform':44 'portfolio':2,15,35,175 'portfolio data' 'portfolio holdings' 'portfolio-holdings' 'post':81 'pure':121 'rate':114 'request':13,26,66,82 'request/response':155 'requir':117 'resolv':139 'respons':165 'retriev':1,14 'return':31,84,173 'schema':156 'scheme':98 'second':108 'settl':58 'spars':130 'spec':153 'specifi':102 'structur':182 'stub':144 'suggest':171 'timeout':109 'unit':72 'unknown':184 'usdc':60,74 'usdc-base' 'util':51 'various':46 'via':5,18 'wallet':103,143 'well':93 'well-form':92 'x402':6,19,56,87 'x402 finance API' 'x402-payment'","prices":[{"id":"b78f39b3-2581-4db4-a1af-73f1cf008833","listingId":"81678bee-ffdb-47f2-b952-c5fd1a2b3a71","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/66/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":"2026-04-18T18:53:20.611Z"}],"sources":[{"listingId":"81678bee-ffdb-47f2-b952-c5fd1a2b3a71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/66/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:20.611Z","lastSeenAt":"2026-04-27T18:36:24.672Z"}],"details":{"listingId":"81678bee-ffdb-47f2-b952-c5fd1a2b3a71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/66/holdings \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66/holdings"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/66/holdings"}],"useCases":["Fetching current holdings for a specific investment portfolio","Integrating portfolio data into dashboards or analytics tools","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers needing on-demand portfolio holdings without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic access to portfolio data where per-call pricing is preferable"],"notFor":["High-frequency polling where $0.02/request adds up quickly","Users who need detailed API documentation or schema guarantees before integrating","Accessing portfolios other than ID 66 (only this specific portfolio path is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.69Z"},"updatedAt":"2026-04-27T18:36:24.672Z"}}