{"id":"900a97f0-9d98-4a7e-90d8-a1bd6c5c402a","shortId":"mauWAk","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/11/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs 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 challenge advertises a `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint uses the \"exact\" payment scheme with a 300-second timeout.\n\nThe specific functionality of this particular endpoint — portfolio transactions for portfolio ID 11 — is not well-documented beyond the generic \"Premium API Access\" label. The broader site lists many endpoints but the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the exact request body schema and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","post-endpoint","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment endpoint","lowpaymentfee API","Base network API","pay-per-call API","crypto payment API"],"warnings":["No API documentation available — all doc pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no content","Request body schema and response format are completely unknown","The endpoint targets a specific portfolio ID (11) with no explanation of what this portfolio represents","No OpenAPI or schema definition provided by the server"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/11/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/11/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 and returns a valid x402 challenge with clear pricing, but there is no documentation on request/response schemas, no OpenAPI spec, and all doc pages return only a wallet-connect prompt. The specific purpose of this portfolio transactions endpoint is unclear beyond its URL 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'/api/v1/portfolios/11/transactions':44 '/docs':179 '/pricing':181 '/readme':182 '0.02':10,24,75,104 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '11':155 '20000':99 '300':140 '6':107 'Base network API' 'USDC micropayment endpoint' 'access':34,166 'advertis':95 'ai/ml':65 'analyt':64 'api':61,110,165 'attach':119 'base':8,22,87,100 'base-network' 'beyond':161 'bodi':200 'broader':50,169 'caller':117 'challeng':94 'connect':187 'content':193 'contract':91 'crawl':176 'crypto payment API' 'data':38,63,68 'decim':108 'document':160,177,196 'endpoint':6,20,30,132,149,173 'equal':103 'exact':135,198 'finance/web3':67 'format':204 'function':145 'gate':3,17,60 'generic':163 'handl':80 'header':124 'id':154 'infer':66 'infrastructur':70 'key':111 'label':167 'limit':114 'list':171 'lowpaymentfee API' 'lowpaymentfee.com':32,52 'mani':172 'maxamountrequir':97 'network':88 'offer':54 'page':178 'part':47 'particular':148 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':78,123,129,136 'per':11,25,76 'platform':51 'portfolio':4,18,36,150,153 'portfolio transactions API' 'portfolio-transactions' 'post':41 'post-endpoint' 'premium':164 'price':73 'prompt':189 'proof':130 'protocol':84 'provid':33 'rate':113 'remain':205 'request':12,26,42,77,199 'requir':116 'respons':203 'return':184 'schema':201 'scheme':137 'second':141 'simpli':118 'site':170 'span':62 'specif':144 'substant':192 'timeout':142 'transact':5,19,37,151 'unit':101 'unknown':206 'usdc':14,28,90,105 'usdc-settlement' 'use':89,106,133 'util':71 'valid':127 'varieti':56 'via':39,81 'wallet':188 'well':159 'well-docu':158 'without':194 'x':122 'x-payment':121 'x402':2,16,59,83,128 'x402 paid API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"848a7b46-a39f-44a9-b8ce-3b097456fc32","listingId":"900a97f0-9d98-4a7e-90d8-a1bd6c5c402a","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/11/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":"2026-04-18T18:52:18.233Z"}],"sources":[{"listingId":"900a97f0-9d98-4a7e-90d8-a1bd6c5c402a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/11/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:18.233Z","lastSeenAt":"2026-04-28T05:34:35.039Z"}],"details":{"listingId":"900a97f0-9d98-4a7e-90d8-a1bd6c5c402a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11/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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/11/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching transaction history for a specific portfolio via a pay-per-request model","Integrating portfolio data into agent workflows that can settle payments on Base","Accessing financial transaction data without needing API keys or subscriptions"],"bestFor":["Agents or applications that can settle x402 payments in USDC on Base","Users who want pay-per-use access to portfolio transaction data without subscriptions","Developers prototyping with low-cost, keyless API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription models","Anyone unable to settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.623Z"},"updatedAt":"2026-04-28T05:34:35.039Z"}}