{"id":"9349f954-9b17-46f3-82ae-562d7f0bd432","shortId":"h4P4Ha","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/70/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 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 x402 challenge metadata.\n\nThe specific endpoint listed here (`/portfolios/70/transactions`) appears to be a fixed portfolio ID (70). Without further documentation it is unclear whether this is a demo portfolio, a shared dataset, or a user-specific resource. The broader site advertises many endpoints across categories but crawled documentation pages returned only wallet-connect prompts with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto portfolio data"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation pages (/docs, /api, /pricing, /README) returned no substantive content","The portfolio ID '70' is hardcoded in the endpoint path with no explanation of what it represents","No information on what fields the POST body accepts or what the response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/70/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/70/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 (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the documentation pages are empty beyond wallet-connect prompts. The specific purpose of portfolio 70 transactions is 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'/portfolios/70/transactions':145 '/request':14,28 '0.02':13,27,68,108 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':100 '300':120 '6':105 '70':153 'Base network API' 'USDC micropayment API' 'access':37 'across':181 'advertis':178 'ai/ml':58 'analyt':57 'api':64,73 'appear':146 'base':9,23,87,101 'base-network' 'beyond':135 'broader':53,176 'call':4,18,110 'categori':182 'challeng':95,138 'commit':80 'connect':191 'content':196 'contract':91 'crawl':184 'crypto portfolio data' 'data':41,56 'dataset':168 'decim':106 'demo':164 'detail':127 'document':128,156,185 'enabl':32 'endpoint':7,21,33,112,134,142,180 'equal':107 'exact':115 'finance/web3':60 'fix':150 'found':130 'id':152 'infer':59 'infrastructur':62 'key':74 'limit':77 'list':143 'lowpaymentfee' 'lowpaymentfee.com':35 'mani':179 'maxamountrequir':98 'metadata':139 'network':88 'no-api-key' 'offer':55 'openapi':124 'page':186 'part':50 'pay':2,16 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request' 'payment':82,116 'per':3,17,69,109 'platform':54 'portfolio':5,19,39,151,165 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':66 'prompt':192 'provid':36 'rate':76 'request':45,70 'requir':81 'resourc':174 'return':187 'schema':125 'scheme':117 'second':121 'settl':84 'share':167 'site':177 'specif':133,141,173 'specifi':96 'substant':195 'timeout':122 'transact':6,20,40 'unclear':159 'unit':102 'usdc':12,26,90 'usdc-settlement' 'use':89,113 'user':172 'user-specif':171 'util':63 'via':10,24,42 'wallet':190 'wallet-connect':189 'whether':160 'without':154 'x402':11,25,31,94,137 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"e75b66f0-3591-4ffd-b76b-dc69192f893a","listingId":"9349f954-9b17-46f3-82ae-562d7f0bd432","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/70/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":"2026-04-18T18:53:15.783Z"}],"sources":[{"listingId":"9349f954-9b17-46f3-82ae-562d7f0bd432","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/70/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:15.783Z","lastSeenAt":"2026-04-27T18:36:24.409Z"}],"details":{"listingId":"9349f954-9b17-46f3-82ae-562d7f0bd432","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/70/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/70/transactions"},{"claim":"All APIs 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/70/transactions"}],"useCases":["Fetching transaction history for a specific portfolio via a single paid API call","Integrating portfolio transaction data into automated trading or analytics pipelines","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction data","AI agents that can settle x402 payments on Base with USDC","Prototyping financial data integrations without subscription commitments"],"notFor":["Users needing bulk historical data exports at scale (no documented batch mode)","Anyone requiring detailed API documentation or OpenAPI specs before integration","Use cases requiring portfolio IDs other than 70 (unclear if other IDs are supported)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.915Z"},"updatedAt":"2026-04-27T18:36:24.409Z"}}