{"id":"806729b6-2247-408c-9ad5-9b6a1452871e","shortId":"gzS6xt","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/49/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 advertises 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, detailed documentation, or example request/response bodies were found during crawling — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause this specific endpoint path references a hardcoded portfolio ID (49), it is unclear whether this is a demo/sample portfolio or whether other portfolio IDs are supported. The lack of input/output schema documentation means callers will need to experiment or contact the provider to understand the expected POST body and response format.","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","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No OpenAPI or input/output schema available — request body format is unknown","Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content","Endpoint path is hardcoded to portfolio ID 49; unclear if other portfolio IDs are supported","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/49/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/49/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, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response, and the endpoint path is hardcoded to portfolio ID 49 with no explanation. Effectively a stub 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'/request':14,28 '0.02':13,27,68,108 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':100 '300':120 '49':163 '6':105 'Base network API' 'USDC micropayment API' 'access':37 'advertis':96 'ai/ml':58 'analyt':57 'api':64,73,140 'base':9,23,87,101 'base-network' 'bodi':131,201 'broader':53 'call':4,18,110 'caller':187 'challeng':95 'commit':80 'connect':146 'contact':193 'content':152 'contract':91 'crawl':135 'crypto payment API' 'data':41,56 'decim':106 'demo/sample':171 'detail':126 'doc':137 'document':127,185 'enabl':32 'endpoint':7,21,33,112,156 'equal':107 'exact':115 'exampl':129 'expect':199 'experi':191 'finance/web3':60 'format':204 'found':133 'hardcod':160 'id':162,177 'infer':59 'infrastructur':62 'input/output':183 'key':74 'lack':181 'limit':77 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':98 'mean':186 'need':189 'network':88 'no-api-key' 'offer':55 'openapi':124 'page':141 'part':50 'path':157 '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':5,19,39,161,172,176 'portfolio transactions API' 'portfolio-transactions' 'post':44,200 'price':66,138 'prompt':148 'provid':36,195 'rate':76 'refer':158 'request':45,70 'request/response':130 'requir':81 'respons':203 'return':143 'schema':125,184 'scheme':117 'second':121 'settl':84 'specif':155 'support':179 'timeout':122 'transact':6,20,40 'unclear':166 'understand':197 'unit':102 'usdc':12,26,90 'usdc-settlement' 'use':89,113 'util':63 'via':10,24,42 'wallet':147 'whether':167,174 'x402':11,25,31,94 'x402 finance endpoint' 'x402-enabled':30 'x402-payment'","prices":[{"id":"f55c9b3b-6256-439e-82d5-ae0eea9123d3","listingId":"806729b6-2247-408c-9ad5-9b6a1452871e","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/49/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":"2026-04-18T18:52:49.501Z"}],"sources":[{"listingId":"806729b6-2247-408c-9ad5-9b6a1452871e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/49/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:49.501Z","lastSeenAt":"2026-04-27T22:33:21.020Z"}],"details":{"listingId":"806729b6-2247-408c-9ad5-9b6a1452871e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/49/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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/portfolios/49/transactions"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/49/transactions"}],"useCases":["Fetching transaction history for a portfolio via a single paid API call","Integrating portfolio transaction data into an agent workflow without managing API keys","Programmatic access to financial transaction records settled via USDC on Base"],"bestFor":["Agents or bots that need on-demand portfolio transaction data without subscription overhead","Developers exploring x402 pay-per-call patterns on Base","Low-volume consumers who prefer per-request billing over monthly plans"],"notFor":["High-volume consumers needing bulk transaction exports at lower per-unit cost","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.08Z"},"updatedAt":"2026-04-27T22:33:21.020Z"}}