{"id":"1a02c105-fdf3-474e-908e-29d15ed2a8ac","shortId":"mykw7d","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/34/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint uses the \"exact\" payment scheme with a 300-second timeout. No OpenAPI schema or detailed documentation was found for this specific endpoint beyond the generic \"Premium API Access\" label.\n\nThe platform's landing page lists numerous other endpoints across categories like sentiment analysis, text summarization, price feeds, geocoding, and more — all at the same $0.02/request price point. However, the crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response format for this transactions endpoint remains undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC micropayment API","Base network API","pay-per-request transactions","lowpaymentfee API"],"warnings":["No OpenAPI or request/response schema available for this endpoint","All documentation pages (/docs, /api, /pricing, /README) returned no useful content — only 'Connect wallet'","The endpoint path references a hardcoded portfolio ID (34); unclear if this is parameterizable","The actual data returned by this endpoint is completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/34/transactions","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/34/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, and all doc pages return only 'Connect wallet' with no content. The purpose of this specific endpoint (portfolio 34 transactions) is unclear beyond its URL 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'/request':14,28,169 '0.02':13,27,68,108,168 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':100 '300':121 '6':105 'Base network API' 'USDC micropayment API' 'access':37,141 'across':152 'actual':194 'ai/ml':58 'analysi':156 'analyt':57 'api':64,73,140,177 'base':9,23,87,101 'base-network' 'beyond':136 'broader':53 'call':4,18,111 'categori':153 'challeng':95 'commit':80 'connect':185 'content':191 'contract':91 'crawl':174 'data':41,56 'decim':106 'detail':128 'doc':175 'document':129 'enabl':32 'endpoint':7,21,33,113,135,151,200 'equal':107 'exact':116 'feed':160 'finance/web3':60 'format':196 'found':131 'generic':138 'geocod':161 'howev':172 'infer':59 'infrastructur':62 'key':74 'label':142 'land':146 'like':154 'limit':77 'list':148 'lowpaymentfee API' 'lowpaymentfee.com':35 'maxamountrequir':98 'network':88 'no-api-key' 'numer':149 'offer':55 'openapi':125 'page':147,180 'part':50 'pay':2,16 'pay-per-cal':1,15 'pay-per-call' 'pay-per-request transactions' 'payment':82,117 'per':3,17,69,110 'platform':54,144 'point':171 'portfolio':5,19,39 'portfolio transactions API' 'portfolio-transactions' 'post':44 'premium':139 'price':66,159,170,176 'prompt':187 'provid':36 'rate':76 'readm':179 'remain':201 'request':45,70 'request/response':195 'requir':81 'return':182 'schema':126 'scheme':118 'second':122 'sentiment':155 'settl':84 'specif':134 'specifi':96 'substant':190 'summar':158 'text':157 'timeout':123 'transact':6,20,40,199 'undocu':202 'unit':102 'usd':109 'usdc':12,26,90 'usdc-settlement' 'use':89,114 'util':63 'via':10,24,42 'wallet':186 'x402':11,25,31,94 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"ef426dbb-9404-4172-aa1a-c08e5d414978","listingId":"1a02c105-fdf3-474e-908e-29d15ed2a8ac","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/34/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:45.881Z"}],"sources":[{"listingId":"1a02c105-fdf3-474e-908e-29d15ed2a8ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/34/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:45.881Z","lastSeenAt":"2026-04-27T22:33:20.866Z"}],"details":{"listingId":"1a02c105-fdf3-474e-908e-29d15ed2a8ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/34/transactions \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/transactions"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/34/transactions"}],"useCases":["Fetching transaction history for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio transaction data","AI agents that can settle x402 payments on Base","Users who prefer no-commitment, usage-based pricing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk/subscription pricing","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.283Z"},"updatedAt":"2026-04-27T22:33:20.866Z"}}