{"id":"24d44170-2ce6-4fc3-aacc-f194104df093","shortId":"9Rsfzf","kind":"x402","title":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 91. 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, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/91/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is settled on-chain via the x402 \"exact\" scheme, meaning the caller includes an X-PAYMENT header with a signed payment proof. No API keys, subscriptions, or rate limits are advertised — access is purely pay-per-request.\n\nDocumentation on the site is extremely thin: the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned upon successful payment — field names, structure, portfolio context — is entirely unknown from the available material. Callers should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for schema details.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","lowpaymentfee","Base USDC micropayment API","portfolio 91"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request body schema or response schema provided; callers must guess or reverse-engineer","The specific portfolio ID 91 is hardcoded in the path with no explanation of what it represents","No OpenAPI or ai-plugin manifest discovered","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/91/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/91/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of 'portfolio 91 holdings' is opaque — it could be sample data or a real portfolio. This is effectively a stub 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'0.02':10,22,102 '000':89 '0x8335':94 '20':88 '2913':95 '402':192 '6':98 '91':35 'Base USDC micropayment API' 'accept':78 'access':139 'actual':196 'advertis':138 'ai/ml':57 'analyt':56 'api':52,131,156 'application/json':222 'avail':183,212 'base':8,20,72,90,97 'behind':65 'broader':41 'call':51,104 'caller':118,214 'chain':110 'challeng':193 'confirm':187 'connect':164 'contact':229 'content':170 'context':206 'crypto portfolio data' 'data':31,55,197 'decim':99 'detail':234 'doc':154 'document':146 'dozen':46 'endpoint':26,53,76,185 'entir':208 'equal':101 'exact':114 'exampl':181 'expect':216 'experi':227 'extrem':151 'field':202 'finance/web3':59 'gate':64 'header':124 'hold':3,15,30 'id':34 'includ':119 'infer':58 'infrastructur':61 'investment holdings' 'json':218 'json-api' 'key':132 'limit':136 'live':188 'lowpaymentfee' 'lowpaymentfee.com':28,43 'materi':213 'maximum':86 'mean':116 'micropay':6,18 'mimetyp':220 'name':203 'need':225 'network':73 'offer':45 'on-chain':108 'openapi':174 'page':159 'part':38 'pay':49,143 'pay-per-cal':48 'pay-per-request':142 'payload':182 'payment':68,105,123,128,201 'per':11,23,50,103,144 'platform':42 'portfolio':2,14,33,205 'portfolio 91' 'portfolio holdings API' 'portfolio-holdings' 'post':79 'price':83,155 'prompt':166 'proof':129 'proper':191 'protocol':69 'provid':231 'pure':141 'rate':135 'readm':158 'render':161 'request':12,24,80,145 'request/response':177 'respons':219 'retriev':1,13 'return':29,189,198 'schema':178,233 'scheme':115 'settl':107 'sign':127 'site':149 'span':54 'spec':175 'specif':75 'structur':204 'subscript':133 'success':200 'thin':152 'unit':91 'unknown':209 'upon':199 'usdc':93 'usdc-base' 'util':62 'via':4,16,111 'wallet':165 'x':122 'x-payment':121 'x402':5,17,67,113 'x402 finance API' 'x402-payment'","prices":[{"id":"4075f022-05fa-400a-9040-e98a306a2909","listingId":"24d44170-2ce6-4fc3-aacc-f194104df093","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/91/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":"2026-04-18T18:53:38.673Z"}],"sources":[{"listingId":"24d44170-2ce6-4fc3-aacc-f194104df093","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/91/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:38.673Z","lastSeenAt":"2026-04-27T22:33:23.068Z"}],"details":{"listingId":"24d44170-2ce6-4fc3-aacc-f194104df093","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/91/holdings \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/91/holdings"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/91/holdings"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current holdings of a specific portfolio on-demand","Integrating portfolio data into trading bots or dashboards that support x402 payments","Agents autonomously purchasing financial data without API key provisioning"],"bestFor":["Developers building on Base who want frictionless pay-per-call portfolio data","AI agents with x402-compatible wallets needing portfolio holdings","Prototyping financial dashboards without committing to subscription APIs"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-request micropayments would be cost-inefficient","Anyone needing portfolio IDs other than 91 (no evidence other IDs are available at this path)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.784Z"},"updatedAt":"2026-04-27T22:33:23.068Z"}}