{"id":"3c12e029-340d-4b79-ab30-b81a65c6ffcd","shortId":"6R5yVX","kind":"x402","title":"x402-payable portfolio transactions endpoint on Base, settled in USDC at $0.02/request.","tagline":"x402-payable portfolio transactions endpoint on Base, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/37/transactions` accepts POST requests and charges per call using USDC on the Base network. Payment is handled inline via the X-PAYMENT header — no API keys or accounts are required.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that advertises a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. The x402 challenge confirms the endpoint is live and returns a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. Settlement goes to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or what parameters it accepts. The endpoint path suggests it retrieves or creates transactions for a specific portfolio (ID 37), but this is inference only.","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","USDC pay-per-call","lowpaymentfee API","Base network API","crypto portfolio data","transaction history API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request parameters or response format","The endpoint path is hardcoded to portfolio ID 37; unclear if other portfolio IDs are supported","No information on what 'transactions' data is returned or what POST body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/37/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/37/transactions","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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose and data model of the portfolio transactions endpoint are entirely 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'/request':14,28 '0.02':13,27,110,136 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '20':126 '37':205 '6':132 'Base network API' 'USDC pay-per-call' 'accept':48,190 'access':34 'account':75 'actual':184 'address':140 'advertis':88 'ai/ml':100 'analyt':99 'api':72,96,151 'base':8,22,59,128,143 'base-network' 'broader':84 'call':54 'challeng':115 'charg':52 'confirm':116 'connect':160 'content':166 'crawl':149 'creat':198 'crypto portfolio data' 'data':38,98,103 'decim':133 'descript':177 'doc':150 'document':144 'endpoint':6,20,30,79,118,183,192 'equal':135 'exampl':174 'extrem':146 'finance/web3':102 'goe':138 'handl':63 'header':70 'id':204 'infer':101,209 'inlin':64 'key':73 'live':120 'lowpaymentfee API' 'lowpaymentfee.com':32,86 'maxamountrequir':124 'network':60 'no-api-key' 'openapi':170 'page':155 'paramet':188 'part':81 'path':193 'pay':93 'pay-per-request':92 'payabl':3,17 'payment':42,61,69 'per':53,94,111 'platform':85 'portfolio':4,18,36,181,203 'portfolio transactions API' 'portfolio-transactions' 'post':49 'price':108,152 'prompt':162 'protocol':43 'provid':33 'readm':154 'request':50,95,112 'request/response':173 'requir':77 'resourc':46 'retriev':196 'return':122,157,185 'schema':171 'servic':106 'settl':9,23 'settlement':137 'span':97 'spars':147 'specif':45,202 'substant':165 'suggest':194 'transact':5,19,37,182,199 'transaction history API' 'unit':129 'usdc':11,25,56,131 'usdc-settlement' 'use':55 'util':105 'varieti':90 'via':39,65 'wallet':161 'x':68 'x-payment':67 'x402':2,16,41,114 'x402 finance endpoint' 'x402-payable':1,15 'x402-payment'","prices":[{"id":"3b74f910-5d04-4b2c-bf36-2aec3f68ac8e","listingId":"3c12e029-340d-4b79-ab30-b81a65c6ffcd","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/37/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":"2026-04-18T18:52:43.516Z"}],"sources":[{"listingId":"3c12e029-340d-4b79-ab30-b81a65c6ffcd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/37/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:43.516Z","lastSeenAt":"2026-04-27T22:33:20.753Z"}],"details":{"listingId":"3c12e029-340d-4b79-ab30-b81a65c6ffcd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/37/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/37/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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/37/transactions"}],"useCases":["Fetching or submitting portfolio transaction records via a single paid API call","Integrating pay-per-request financial data into agent workflows without managing API keys","Programmatic access to portfolio data settled on-chain via USDC on Base"],"bestFor":["Agents or bots that need keyless, pay-per-call access to portfolio transaction data","Developers experimenting with x402 payment protocol integrations","Workflows requiring low-cost, on-demand financial data without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone needing portfolio IDs other than 37 (no evidence of parameterized portfolio access)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.417Z"},"updatedAt":"2026-04-27T22:33:20.753Z"}}