{"id":"ea49d8ea-c2ad-4108-aaf1-82c4787227d1","shortId":"6vNvJq","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402, settled in USDC.","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402, settled in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data at `/api/v1/portfolios/85/transactions`. It accepts POST requests and is gated by an x402 payment challenge, settling on the Base network in USDC. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 protocol using USDC on the Base L2 network.\n\nDocumentation for this specific endpoint is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint is confirmed live (returns a valid 402 challenge), but the actual functionality behind the paywall is unknown beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call"],"categories":["finance"],"synonyms":["portfolio transactions","transaction history","portfolio API","x402 finance API","crypto portfolio","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc/API/pricing/README pages return only a 'Connect wallet' prompt with no substantive content","The specific functionality of /api/v1/portfolios/85/transactions is undocumented — it is unclear what request body is expected or what response is returned","The portfolio ID '85' is hardcoded in the path; it is unknown whether other portfolio IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/85/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/85/transactions","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 x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The actual behavior behind the paywall is entirely 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'0.02':80,116 '000':71 '20':70 '402':201 '6':76 'accept':45,190 'access':37,130,217 'actual':205 'advertis':121 'ai':105 'amount':65 'analyt':104 'api':101,123,157,216 'base':9,23,59,72,143 'base-network' 'behind':207 'beyond':212 'broader':89 'call':4,18,68,100 'challeng':55,202 'confirm':196 'connect':166 'content':172 'crawl':155 'crypto portfolio' 'data':41,103 'decim':77 'descript':183 'doc':156 'document':146 'enabl':32 'endpoint':7,21,33,84,150,189,194 'entir':134 'equal':79 'exampl':180 'extrem':152 'field':186 'financ':108 'function':206 'gate':50 'generic':214 'handl':133 'infrastructur':111 'instant':129 'key':124 'l2':144 'label':218 'learn':107 'limit':127 'live':197 'lowpaymentfee' 'lowpaymentfee.com':35,91 'machin':106 'maximum':64 'network':60,145 'offer':93 'openapi':176 'page':161 'part':86 'pay':2,16,98 'pay-per-cal':1,15,97 'pay-per-call' 'payment':54,131 'paywal':209 'per':3,17,67,81,99,117 'platform':90,120 'portfolio':5,19,39 'portfolio API' 'portfolio transactions' 'portfolio-transactions' 'post':46 'premium':215 'price':114,158 'prompt':168 'protocol':138 'provid':36 'rate':126 'readm':160 'request':47,82,118 'request/response':179 'requir':66 'return':163,192,198 'schema':177 'settl':12,26,56 'span':102 'spars':153 'specif':149 'transact':6,20,40,188 'transaction history' 'unit':73 'unknown':211 'usdc':14,28,62,75,140 'usdc-settlement' 'use':139 'util':112 'valid':200 'varieti':95 'via':10,24 'wallet':167 'web3':109 'x402':11,25,31,53,137 'x402 finance API' 'x402-enabled':30 'x402-payment'","prices":[{"id":"f2036091-9e24-4082-9526-606e8e6cc8b6","listingId":"ea49d8ea-c2ad-4108-aaf1-82c4787227d1","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/85/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":"2026-04-18T18:53:27.865Z"}],"sources":[{"listingId":"ea49d8ea-c2ad-4108-aaf1-82c4787227d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/85/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:27.865Z","lastSeenAt":"2026-04-27T22:33:22.695Z"}],"details":{"listingId":"ea49d8ea-c2ad-4108-aaf1-82c4787227d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/85/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/85/transactions"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/85/transactions"}],"useCases":["Retrieving transaction records for a specific portfolio","Integrating portfolio transaction data into automated trading or analytics pipelines","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing pay-per-call portfolio transaction data without API key management","AI agents that can settle x402 payments on Base in USDC","Users who want low-cost, commitment-free access to financial transaction endpoints"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from subscription-based pricing rather than per-call fees","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.241Z"},"updatedAt":"2026-04-27T22:33:22.695Z"}}