{"id":"205d4ef4-c730-46c0-82df-d2a758db0e90","shortId":"LftzMp","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/4/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys are needed; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The platform advertises no rate limits and instant access.\n\nThe specific functionality of this particular endpoint — portfolio transactions for portfolio ID 4 — is not well-documented. The landing page does not list this endpoint among its advertised APIs, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. It is unclear what request body this POST endpoint expects or what transaction data it returns. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation on input/output schemas limits its usability without further experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","post-endpoint","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC micropayment API","Base network API","pay-per-call transactions","lowpaymentfee API","crypto-settled API"],"warnings":["This specific endpoint (/api/v1/portfolios/4/transactions) is not listed among the platform's advertised APIs — its purpose and expected input/output are undocumented.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No request body schema or response schema is available; callers must experiment to discover the expected format.","The hardcoded portfolio ID '4' in the URL suggests this may be a specific resource rather than a general-purpose endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/4/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/4/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation on request/response schemas, no OpenAPI spec, and the specific endpoint is not listed among the platform's advertised APIs. Docs pages are empty beyond a wallet connect prompt. Effectively a stub with confirmed 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'0.02':10,24,75,108 '000':99 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':98 '4':149 '402':209 '6':104 'Base network API' 'USDC micropayment API' 'access':34,136 'addit':183 'advertis':130,165 'ai/ml':65 'among':163 'amount':95 'analyt':64 'api':60,110,166,172 'attach':116 'base':8,22,87,100 'base-network' 'bodi':190 'broader':50 'caller':114 'challeng':210 'confirm':204 'connect':178 'content':184 'contract':91 'crypto-settled API' 'data':38,63,68,198 'decim':105 'doc':169 'document':154,215 'dozen':55 'endpoint':6,20,30,61,143,162,193,202 'equal':107 'expect':194 'experiment':224 'finance/web3':67 'function':139 'gate':3,17,59 'handl':80 'header':121 'id':148 'infer':66 'infrastructur':70 'input/output':217 'instant':135 'key':111 'lack':213 'land':156 'limit':133,219 'list':160 'live':205 'lowpaymentfee API' 'lowpaymentfee.com':32,52 'max':94 'need':113 'network':88 'no-api-key' 'offer':54 'page':157,173 'part':47 'particular':142 'pay':9,23 'pay-per-call transactions' 'pay-per-request' 'payment':78,120,126 'per':11,25,76 'platform':51,129 'portfolio':4,18,36,144,147 'portfolio transactions API' 'portfolio-transactions' 'post':41,192 'post-endpoint' 'price':73,170 'prompt':180 'proof':127 'proper':208 'protocol':84 'provid':33 'rate':132 'render':175 'request':12,26,42,77,189 'requir':96 'return':200,206 'schema':218 'simpli':115 'span':62 'specif':138 'transact':5,19,37,145,197 'unclear':187 'unit':101 'usabl':221 'usdc':14,28,90,103 'usdc-settlement' 'use':89 'util':71 'valid':124 'via':39,81 'wallet':179 'well':153 'well-docu':152 'without':222 'x':119 'x-payment':118 'x402':2,16,58,83,125 'x402 finance endpoint' 'x402-gated':1,15,57 'x402-payment'","prices":[{"id":"2858fce2-5065-4fcb-960a-36f0f2a8663c","listingId":"205d4ef4-c730-46c0-82df-d2a758db0e90","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/4/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":"2026-04-18T18:52:45.881Z"}],"sources":[{"listingId":"205d4ef4-c730-46c0-82df-d2a758db0e90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/4/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:45.881Z","lastSeenAt":"2026-04-27T22:33:20.868Z"}],"details":{"listingId":"205d4ef4-c730-46c0-82df-d2a758db0e90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/4/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/4/transactions"},{"claim":"The platform advertises $0.02 per request pricing 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/4/transactions"}],"useCases":["Fetching portfolio transaction history via a single paid API call","Integrating pay-per-request financial data into agent workflows","Accessing transaction data without managing API keys or subscriptions"],"bestFor":["Agents or developers who want keyless, pay-per-call access to portfolio data","Crypto-native applications already on the Base network","Prototyping integrations without upfront API key registration"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume consumers who would prefer subscription-based pricing","Anyone needing portfolio IDs other than 4 (no evidence of parameterized access)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.283Z"},"updatedAt":"2026-04-27T22:33:20.868Z"}}