{"id":"aa23a4a6-fd52-4fb6-ad04-3c120dae8713","shortId":"5TTuxR","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 79. 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.\n\nThe specific endpoint `/api/v1/portfolios/79/holdings` accepts POST requests and is priced at $0.02 per call (20,000 base units of USDC on Base, which uses 6 decimals). Payment is settled on-chain via USDC (contract 0x8335…2913) to the payTo address. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation on the site is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the holdings response actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers must experiment to discover the expected POST body and response shape.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","lowpaymentfee API","Base USDC API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No request body schema or response schema provided; callers must guess the expected input.","The endpoint is specific to portfolio ID 79 with no explanation of what this portfolio represents.","The broader platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/79/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/79/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 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The purpose of 'portfolio 79 holdings' is unexplained. This is effectively a stub 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'0.02':11,24,88 '000':92 '0x8335':112 '20':91 '2913':113 '402':193 '6':101 '79':37 'Base USDC API' 'accept':81 'actual':183 'address':117 'ai/ml':59 'analyt':58 'api':54,119,152 'attach':130 'base':9,22,75,93,98 'behind':68 'bodi':209 'broader':43 'call':53,90 'caller':128,201 'chain':108 'challeng':194 'commit':125 'confirm':188 'connect':160 'contain':184 'content':166 'contract':111 'crypto portfolio' 'data':4,17,33,57,62 'decim':102 'descript':177 'discov':205 'doc':150 'document':142,199 'dozen':48 'endpoint':28,55,79,186 'exampl':174 'expect':207 'experi':203 'extrem':147 'finance/web3':61 'gate':67 'header':135 'hold':3,16,32,181 'id':36 'infer':60 'investment holdings' 'key':120 'lack':197 'limit':122 'live':189 'lowpaymentfee API' 'lowpaymentfee.com':30,45 'mean':200 'micropay':7,20 'must':202 'network':76 'no-api-key' 'offer':47 'on-chain':106 'openapi':170 'page':155 'part':40 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':71,103,134,140 'payto':116 'per':12,25,52,89 'platform':44 'portfolio':2,15,35 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':82,208 'price':86,151 'prompt':162 'proof':141 'proper':192 'protocol':72 'rate':121 'readm':154 'render':157 'request':13,26,83 'request/response':173 'requir':127 'respons':182,211 'retriev':1,14 'return':31,190 'schema':171 'servic':65 'settl':105 'shape':212 'simpli':129 'site':145 'span':56 'spars':148 'specif':78 'unit':94 'upfront':124 'usdc':96,110 'usdc-base' 'use':100 'util':64 'valid':138 'via':5,18,109 'wallet':161 'x':133 'x-payment':132 'x402':6,19,70,139 'x402 finance API' 'x402-payment'","prices":[{"id":"5059fbaf-0521-4601-ba43-01b1e0c883a3","listingId":"aa23a4a6-fd52-4fb6-ad04-3c120dae8713","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/79/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":"2026-04-18T18:53:32.650Z"}],"sources":[{"listingId":"aa23a4a6-fd52-4fb6-ad04-3c120dae8713","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/79/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:32.650Z","lastSeenAt":"2026-04-27T22:33:22.853Z"}],"details":{"listingId":"aa23a4a6-fd52-4fb6-ad04-3c120dae8713","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/79/holdings \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/79/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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/79/holdings"}],"useCases":["Fetching holdings data for a specific portfolio via micropayment","Integrating portfolio data into automated trading or analytics pipelines","Querying investment positions without needing an API key or subscription"],"bestFor":["Agents or bots that need on-demand portfolio holdings data with no signup","Developers experimenting with x402 pay-per-call patterns on Base","Low-volume consumers who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed schema stability","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 79)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.055Z"},"updatedAt":"2026-04-27T22:33:22.853Z"}}