{"id":"68fb482f-4b3c-49ce-b3c2-2de1306dfdda","shortId":"Ub8dUZ","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 to `/api/v1/portfolios/32/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 settled on the Base network using USDC.\n\nThe specific endpoint probed here returns an x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (the asset at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely via the x402 protocol's `X-PAYMENT` header.\n\nDocumentation 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 schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or what parameters it accepts. The endpoint's purpose (portfolio transaction data) is inferred solely from the URL path. The platform hosts many other endpoints but this listing covers only the `/api/v1/portfolios/32/transactions` route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call API","crypto payment API","transaction data"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; request body format and response structure are unknown.","The specific purpose of /api/v1/portfolios/32/transactions (what portfolio '32' refers to, what data is returned) is entirely unclear.","Platform appears to be a demonstration or early-stage service with many generic endpoint categories but no substantive documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/32/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/32/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it is operational. However, there is no OpenAPI schema, no documentation of request parameters or response format, and no examples. The endpoint's actual functionality is inferred only from the URL path. Docs pages are empty beyond a wallet-connect 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'/request':126 '0.02':113,125 '000':94 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '20':93 '6':108 'Base network API' 'USDC micropayment API' 'accept':200 'access':34,141 'across':127 'actual':194 'advertis':121,132 'ai/ml':65 'analyt':64 'api':61,134,161 'asset':100 'base':8,22,76,95,104 'base-network' 'broader':50 'call':12,26 'challeng':88 'connect':170 'consist':116 'content':176 'cover':224 'crypto payment API' 'data':38,63,68,207 'decim':109 'descript':187 'doc':160 'document':155 'endpoint':6,20,30,82,129,193,202,220 'entir':145 'exampl':184 'extrem':157 'finance/web3':67 'flat':122 'gate':3,17,60 'handl':144 'header':154 'host':217 'infer':66,209 'infrastructur':70 'instant':140 'key':135 'limit':138 'list':223 'lowpaymentfee' 'lowpaymentfee.com':32,52 'mani':218 'maxamountrequir':91 'network':77 'no-api-key' 'offer':54 'openapi':180 'page':165 'paramet':198 'part':47 'path':214 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':142,153 'per':11,25,114 'platform':51,131,216 'portfolio':4,18,36,191,205 'portfolio transactions API' 'portfolio-transactions' 'post':41 'post-method' 'price':123,162 'probe':83 'prompt':172 'protocol':149 'provid':33 'purpos':204 'rate':137 'readm':164 'render':167 'request':42,115 'request/response':183 'return':85,195 'rout':228 'schema':181 'settl':73 'sinc':105 'site':119 'sole':210 'span':62 'spars':158 'specif':81 'substant':175 'transact':5,19,37,192,206 'transaction data' 'translat':111 'unit':96 'url':213 'usdc':14,28,79,98,106 'usdc-settlement' 'use':78,107 'util':71 'varieti':56 'via':39,146 'wallet':171 'x':152 'x-payment':151 'x402':2,16,59,87,148 'x402 paid API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"4d36a582-1cd7-4c5d-9127-5989bf704926","listingId":"68fb482f-4b3c-49ce-b3c2-2de1306dfdda","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/32/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":"2026-04-18T18:52:44.689Z"}],"sources":[{"listingId":"68fb482f-4b3c-49ce-b3c2-2de1306dfdda","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/32/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:44.689Z","lastSeenAt":"2026-04-27T22:33:20.815Z"}],"details":{"listingId":"68fb482f-4b3c-49ce-b3c2-2de1306dfdda","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/32/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":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/transactions"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32/transactions"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific portfolio","Integrating portfolio transaction data into automated trading or analytics pipelines","Agent-driven portfolio monitoring with per-call USDC payments"],"bestFor":["Developers wanting keyless, pay-per-request access to portfolio 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 request/response schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.334Z"},"updatedAt":"2026-04-27T22:33:20.815Z"}}