{"id":"012743fb-084e-4213-88fc-9c3faf9d24be","shortId":"weTP2z","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request","tagline":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 94. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/94/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted per-request upon valid x402 payment. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists many endpoints at uniform $0.02 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. The exact structure of the holdings response and what POST body (if any) is expected are unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-holdings","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","x402 finance API","crypto portfolio data","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No request or response schema available — POST body requirements are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific portfolio ID 94 is hardcoded in the URL; it is unclear whether other portfolio IDs exist or how they are discovered","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/94/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/94/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 request/response schema, no examples, and no explanation of what 'portfolio 94 holdings' actually contains. This is effectively a stub 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'/request':12,24 '0.02':11,23,110,158 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':98 '20':104 '300':144 '6':113 '94':36 'Base USDC API' 'accept':81 'access':123 'addit':186 'address':136 'advertis':122 'ai/ml':58 'analyt':57 'api':54,116,172 'avail':206 'base':8,20,73,96,106 'behind':66 'bodi':198 'broader':42 'chain':92 'connect':181 'content':187 'contract':97 'cost':102 'crypto portfolio data' 'data':3,15,32,56 'decim':114 'descript':166 'doc':171 'document':146 'endpoint':26,79,155 'equal':109 'exact':189 'exampl':168 'expect':202 'extrem':148 'finance/web3':60 'gate':65 'grant':125 'hold':2,14,31,193 'id':35 'infer':59 'infrastructur':62 'investment holdings' 'json':86 'json-response' 'key':117 'land':151 'limit':120 'list':153 'lowpaymentfee' 'lowpaymentfee.com':28,44 'mani':154 'materi':207 'maximum':101 'micropay':6,18 'micropayment API' 'network':9,21,74 'no-api-key' 'offer':46 'on-chain':90 'page':152,176 'paramet':165 'part':39 'pay':51 'pay-per-request':50 'payload':169 'payment':69,87,132,134,141 'per':52,127 'per-request':126 'platform':43 'portfolio':1,13,30,34 'portfolio holdings API' 'portfolio-holdings' 'post':82,197 'price':159,173 'prompt':183 'protocol':70 'provid':161 'rate':119 'readm':175 'recipi':135 'render':178 'request':53,83,128 'request/response':163 'respons':194 'return':29,85 'schema':164 'second':145 'settl':89 'span':55 'spars':149 'specif':78 'structur':190 'timeout':142 'uniform':157 'unit':107 'unknown':204 'upon':129 'usdc':76,94,111 'usdc-base' 'use':75,112 'util':63 'valid':130 'varieti':48 'via':4,16,93 'wallet':182 'x402':5,17,68,131 'x402 finance API' 'x402-payment'","prices":[{"id":"fd1a8506-166d-4037-af30-c393413f1094","listingId":"012743fb-084e-4213-88fc-9c3faf9d24be","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/94/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":"2026-04-18T18:53:47.117Z"}],"sources":[{"listingId":"012743fb-084e-4213-88fc-9c3faf9d24be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/94/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:47.117Z","lastSeenAt":"2026-04-27T12:34:56.578Z"}],"details":{"listingId":"012743fb-084e-4213-88fc-9c3faf9d24be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/94/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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/94/holdings"},{"claim":"Platform pricing is $0.02 per request 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/94/holdings"}],"useCases":["Retrieve holdings data for a specific portfolio via a single micropayment","Integrate portfolio data into automated trading or analytics pipelines","Agent-driven portfolio monitoring without managing API keys"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio data","AI agents that can settle x402 payments on Base","Quick one-off portfolio lookups without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Bulk or high-frequency data retrieval where per-request fees add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.365Z"},"updatedAt":"2026-04-27T12:34:56.578Z"}}