{"id":"cee5e315-6536-4246-9608-610da5d8fca8","shortId":"5ZYth8","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/82/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 at 6 decimals equals $0.02. There are no API keys, no rate limits, and no sign-up required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The payment timeout is 300 seconds.\n\nThe specific endpoint (`/portfolios/82/transactions`) appears to serve transaction records for a particular portfolio (ID 82). However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the endpoint accepts or returns. The endpoint is confirmed live (returns 402 as expected), but the lack of documentation makes it difficult to determine the exact request format or response structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","post-endpoint","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio transactions","transaction history","financial transactions API","x402 API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request or response formats","The endpoint path references a hardcoded portfolio ID (82); unclear if other portfolio IDs are supported","This specific endpoint is not listed on the site's homepage API catalog, making its purpose uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/82/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/82/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no usable content. The specific purpose of the /portfolios/82/transactions endpoint is unclear beyond the generic 'Premium API Access' 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'/portfolios/82/transactions':145 '0.02':10,24,75,107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20000':99 '300':140 '402':205 '6':104 '82':156 'Base network API' 'USDC micropayment API' 'accept':196 'access':34 'advertis':95 'ai/ml':65 'analyt':64 'api':61,111,164 'appear':146 'attach':124 'base':8,22,87,100 'base-network' 'broader':50 'caller':122 'challeng':94 'confirm':202 'connect':173 'contract':91 'data':38,63,68 'decim':105 'descript':190 'detail':179 'determin':217 'difficult':215 'doc':163 'document':158,212 'endpoint':6,20,30,144,195,200 'equal':106 'exact':219 'exampl':187 'expect':207 'extrem':160 'field':193 'finance/web3':67 'financial transactions API' 'format':221 'gate':3,17,60 'handl':80 'header':129 'howev':157 'id':155 'infer':66 'infrastructur':70 'key':112 'lack':210 'limit':115 'live':203 'lowpaymentfee' 'lowpaymentfee.com':32,52 'make':213 'maxamountrequir':97 'network':88 'no-api-key' 'offer':54 'openapi':183 'page':168 'part':47 'particular':153 'pay':9,23 'pay-per-request' 'payment':78,128,134,137 'per':11,25,76 'platform':51 'portfolio':4,18,36,154 'portfolio transactions' 'portfolio-transactions' 'post':41 'post-endpoint' 'price':73,165 'prompt':175 'proof':135 'protocol':84 'provid':33 'rate':114 'readm':167 'record':150 'render':170 'request':12,26,42,77,220 'request/response':186 'requir':121 'respons':223 'return':198,204 'schema':184 'second':141 'serv':148 'sign':119 'sign-up':118 'simpli':123 'span':62 'spars':161 'specif':143 'structur':224 'timeout':138 'transact':5,19,37,149 'transaction history' 'unit':101 'usdc':14,28,90 'usdc-settlement' 'use':89 'util':71 'valid':132 'varieti':56 'via':39,81 'wallet':174 'x':127 'x-payment':126 'x402':2,16,59,83,133 'x402 API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"86f82bd7-6618-4769-beb5-fae3a2c8c676","listingId":"cee5e315-6536-4246-9608-610da5d8fca8","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/82/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":"2026-04-18T18:53:26.644Z"}],"sources":[{"listingId":"cee5e315-6536-4246-9608-610da5d8fca8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/82/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:26.644Z","lastSeenAt":"2026-04-27T17:05:05.074Z"}],"details":{"listingId":"cee5e315-6536-4246-9608-610da5d8fca8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/82/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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/82/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/82/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction records for a specific portfolio","Integrating portfolio transaction data into financial dashboards","Automated agents querying transaction history with per-call USDC payments"],"bestFor":["Developers wanting keyless, pay-per-call access to 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 OpenAPI specs before integrating","Applications requiring bulk/batch transaction exports at low cost","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.347Z"},"updatedAt":"2026-04-27T17:05:05.074Z"}}