{"id":"34e7c622-1292-480d-9cb1-6c87e5c0909c","shortId":"F9Ffkh","kind":"x402","title":"Portfolio transactions endpoint on Base, paid per-call via x402 with USDC.","tagline":"Portfolio transactions endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/58/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC via the x402 protocol.\n\nThe specific endpoint probed here charges a maximum of $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled inline: callers attach an `X-PAYMENT` header conforming to x402 version 1, with the \"exact\" scheme on Base mainnet. The USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys, rate limits, or upfront commitments are required — you pay per call.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know the expected POST body or the shape of the response. The platform's landing page lists this endpoint under \"Finance & Web3\" but the specific `/portfolios/58/transactions` path is not listed among the advertised APIs, suggesting it may be a specific portfolio resource rather than a general-purpose endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","web3"],"synonyms":["portfolio transactions API","x402 USDC endpoint","pay-per-call finance API","Base network API","lowpaymentfee","crypto portfolio data","transaction history API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt","No OpenAPI or request/response schema provided","The specific path /api/v1/portfolios/58/transactions is not listed among the site's advertised APIs — it may be a hardcoded portfolio resource","Cannot confirm what POST body fields are expected or what the response looks like"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/58/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/58/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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific portfolio endpoint isn't even listed on the site's landing page. Effectively a stub 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'/portfolios/58/transactions':232 '0.02':92 '000':96 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':132 '1':119 '20':95 '402':198 '6':102 'Base network API' 'accept':187 'access':32 'advertis':239 'ai/ml':64 'among':237 'analyt':63 'api':60,134,154,240 'asset':129 'attach':109 'base':5,18,75,97,125 'base-network' 'bodi':211 'broader':48 'call':9,22,146 'caller':108 'challeng':199 'charg':88 'commit':140 'confirm':193 'conform':115 'connect':163 'content':169 'contract':130 'crawl':152 'crypto portfolio data' 'data':36,62,67 'decim':103 'descript':180 'difficult':205 'doc':153 'document':147,202 'endpoint':3,16,28,85,186,191,225,255 'exact':122 'exampl':177 'expect':209 'extrem':149 'field':183 'financ':227 'finance/web3':66 'general':253 'general-purpos':252 'handl':106 'header':114 'infer':65 'infrastructur':69 'inlin':107 'key':135 'know':207 'land':221 'limit':137 'list':223,236 'live':194 'lowpaymentfee' 'lowpaymentfee.com':30,50 'mainnet':126 'maximum':90 'may':243 'network':76 'no-api-key' 'offer':52 'openapi':173 'page':158,222 'paid':6,19 'part':45 'path':233 'pay':57,144 'pay-per-call finance API' 'pay-per-request':56 'payment':104,113 'per':8,21,58,93,145 'per-cal':7,20 'platform':49,219 'portfolio':1,14,34,247 'portfolio transactions API' 'portfolio-transactions' 'post':39,210 'price':155 'probe':86 'prompt':165 'proper':197 'protocol':82 'provid':31 'purpos':254 'rate':136 'rather':249 'readm':157 'request':40,59,94 'request/response':176 'requir':142 'resourc':248 'respons':217 'return':160,189,195 'schema':174 'scheme':123 'settl':72 'shape':214 'span':61 'spars':150 'specif':84,231,246 'substant':168 'suggest':241 'transact':2,15,35,185 'transaction history API' 'unit':98 'upfront':139 'usdc':13,26,78,100,128 'usdc-settlement' 'use':77 'util':70 'varieti':54 'version':118 'via':10,23,37,79 'wallet':164 'web3':228 'without':201 'x':112 'x-payment':111 'x402':11,24,81,117 'x402 USDC endpoint' 'x402-payment'","prices":[{"id":"000aadcd-378d-492f-94c2-1e039dff94cf","listingId":"34e7c622-1292-480d-9cb1-6c87e5c0909c","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/58/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":"2026-04-18T18:53:07.904Z"}],"sources":[{"listingId":"34e7c622-1292-480d-9cb1-6c87e5c0909c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/58/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:07.904Z","lastSeenAt":"2026-04-23T02:01:26.826Z"}],"details":{"listingId":"34e7c622-1292-480d-9cb1-6c87e5c0909c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/58/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 endpoint returns a 402 challenge with x402 version 1, exact scheme, on Base network, with USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/58/transactions"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages return only a Connect wallet prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching transaction history for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers wanting keyless, pay-per-use portfolio transaction access","AI agents that can settle payments on Base via x402","Projects needing low-friction access to financial transaction data without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch transaction exports where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.148Z"},"updatedAt":"2026-04-23T02:01:26.826Z"}}