{"id":"1d1246d8-07d4-4b08-a904-2c9aa931e241","shortId":"GbMtLR","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request, gated by the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers numerous pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/26/transactions` is described generically as \"Premium API Access\" with no further documentation on request or response schemas. The x402 challenge confirms it is live, accepting exact-scheme payments on Base with a max amount of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The exact data returned by this portfolio transactions endpoint is unknown beyond its generic title.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-call finance API","lowpaymentfee","crypto portfolio data"],"warnings":["No request or response schema documented — callers cannot know what to send or expect back","All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no content","The endpoint path references a specific portfolio ID (26) with no explanation of what portfolio this represents","No OpenAPI or ai-plugin manifest available","Generic 'Premium API Access' description provides no meaningful information about the endpoint's function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/26/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/26/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a generic title, and all doc pages render only 'Connect wallet'. The purpose of this specific portfolio endpoint is 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'/request':154 '0.02':128,153 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '20':122 '300':145 '6':135 'Base network API' 'USDC micropayment API' 'accept':110 'access':34,93,166 'address':141 'advertis':150 'ai/ml':68 'amount':120 'analyt':67 'api':64,92,159,174 'avail':202 'base':8,22,79,116,124 'base-network' 'beyond':214 'broader':54 'call':12,26 'challeng':105 'confirm':106 'connect':183 'content':189 'crypto portfolio data' 'data':38,66,71,205 'decim':136 'describ':88 'doc':173 'document':97,168,198 'endpoint':6,20,30,85,211 'exact':112,204 'exact-schem':111 'exampl':201 'extrem':170 'finance/web3':70 'gate':3,17,43 'generic':89,216 'howev':167 'infer':69 'infrastructur':73 'instant':165 'key':160 'limit':163 'live':109 'lowpaymentfee' 'lowpaymentfee.com':32,56 'made':139 'max':119 'model':156 'network':80 'no-api-key' 'numer':59 'offer':58 'openapi':193 'page':178 'part':51 'pay':10,24,61 'pay-per-cal':9,23 'pay-per-call finance API' 'pay-per-request':60 'payment':47,114,137 'per':11,25,62,130 'platform':55,149 'portfolio':4,18,36,209 'portfolio transactions API' 'portfolio-transactions' 'post':41 'premium':91 'price':155,175 'prompt':185 'protocol':48 'provid':33 'rate':162 'readm':177 'render':180 'request':42,63,99,131 'request/response':196 'respons':101 'return':206 'schema':102,197 'scheme':113 'second':146 'settl':76 'sinc':132 'span':65 'spars':171 'spec':194 'specif':84 'substant':188 'timeout':147 'titl':217 'transact':5,19,37,210 'uniform':152 'unit':125 'unknown':213 'usd':129 'usdc':14,28,82,127,133 'usdc-settlement' 'use':81,134 'util':74 'via':39 'wallet':184 'x402':2,16,46,104 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"570a0795-babc-449c-9684-5cf9de7e555a","listingId":"1d1246d8-07d4-4b08-a904-2c9aa931e241","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/26/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":"2026-04-18T18:52:30.290Z"}],"sources":[{"listingId":"1d1246d8-07d4-4b08-a904-2c9aa931e241","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/26/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:30.290Z","lastSeenAt":"2026-04-28T03:05:37.396Z"}],"details":{"listingId":"1d1246d8-07d4-4b08-a904-2c9aa931e241","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/26/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 returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals) on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/portfolios/26/transactions"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/portfolios/26/transactions"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific portfolio via automated agents","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven financial data retrieval with per-call USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-request portfolio transaction data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.03Z"},"updatedAt":"2026-04-28T03:05:37.396Z"}}