{"id":"e0021bc9-9925-4a65-a22e-79e8d9213461","shortId":"dSjRn6","kind":"x402","title":"Pay-per-call portfolio transactions API on Base network via x402 protocol at $0.02/request.","tagline":"Pay-per-call portfolio transactions API on Base network via x402 protocol at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data (portfolio ID 8) via the x402 payment protocol. It accepts POST requests and charges $0.02 per call, settled in USDC on the Base network. No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.\n\nThe endpoint is part of a broader platform offering multiple API categories including data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. The specific functionality of the `/portfolios/8/transactions` endpoint is not well-documented beyond its title \"Premium API Access,\" but the path structure suggests it returns or creates transaction records for a specific portfolio.\n\nPayment is made in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge is live and responds correctly with version 1 of the protocol. No OpenAPI schema, detailed documentation, or example responses are available from the crawled pages.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio transactions","transaction history","x402 API","pay-per-call API","USDC micropayment","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available","Documentation pages return only 'Connect wallet' with no useful content","Exact functionality of /portfolios/8/transactions is undocumented — path suggests portfolio-specific transaction data but details are unknown","Platform appears to be a generic demo or placeholder with many endpoints all at the same price"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/8/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/8/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, but there is no documentation on request/response schemas, no OpenAPI spec, and the crawled docs/pricing/API pages only show a wallet connect prompt. The actual functionality of this specific endpoint is unclear beyond its URL 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'/request':16,32 '0.02':15,31,57,111,166 '000':162 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':153 '1':182 '20':161 '6':170 '8':45 'Base network API' 'USDC micropayment' 'accept':52 'access':38,131 'ai/ml':100 'amount':159 'analyt':99 'api':7,23,68,95,130 'avail':195 'base':9,25,65,155,163 'base-network' 'beyond':126 'broader':91 'call':4,20,59 'categori':96 'challeng':174 'charg':56 'contract':152 'correct':179 'crawl':198 'creat':140 'data':42,98,103 'decim':171 'detail':189 'document':125,190 'endpoint':34,86,120 'exampl':192 'finance/web3':102 'function':116 'given':167 'handl':77 'header':84 'i.e':165 'id':44 'includ':97 'infer':101 'infrastructur':105 'inlin':78 'key':69 'limit':72 'live':176 'lowpaymentfee' 'lowpaymentfee.com':36 'made':149 'maximum':158 'multipl':94 'network':10,26,66 'no-api-key' 'offer':93 'openapi':187 'page':199 'part':88 'path':134 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':49,75,83,147 'per':3,19,58,112 'platform':92 'portfolio':5,21,40,43,146 'portfolio transactions' 'portfolio-transactions' 'post':53 'post-endpoint' 'premium':129 'price':108 'protocol':13,29,50,185 'provid':37 'rate':71 'record':142 'request':54,113 'requir':74 'respond':178 'respons':193 'return':138 'schema':188 'settl':60 'specif':115,145 'structur':135 'suggest':136 'titl':128 'transact':6,22,41,141 'transaction history' 'uniform':109 'unit':164 'usdc':62,151,168 'usdc-settlement' 'util':106 'version':181 'via':11,27,46,79 'well':124 'well-docu':123 'x':82 'x-payment':81 'x402':12,28,48,173 'x402 API' 'x402-payment'","prices":[{"id":"b513a2a6-6f20-496f-8d4f-883fdd26fea8","listingId":"e0021bc9-9925-4a65-a22e-79e8d9213461","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/8/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":"2026-04-18T18:53:26.643Z"}],"sources":[{"listingId":"e0021bc9-9925-4a65-a22e-79e8d9213461","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/8/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:26.643Z","lastSeenAt":"2026-04-27T17:05:05.053Z"}],"details":{"listingId":"e0021bc9-9925-4a65-a22e-79e8d9213461","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/8/transactions"},{"claim":"Platform advertises $0.02/request pricing 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/8/transactions"}],"useCases":["Retrieving or creating transaction records for a specific portfolio","Integrating pay-per-call financial data into agent workflows","Accessing portfolio data without managing API keys or subscriptions"],"bestFor":["Agents needing on-demand portfolio transaction data without subscription overhead","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer per-request pricing"],"notFor":["High-volume bulk transaction data retrieval (no documented batch endpoints)","Users who need detailed API documentation or OpenAPI specs before integrating","Non-crypto-native consumers who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.365Z"},"updatedAt":"2026-04-27T17:05:05.053Z"}}