{"id":"dc93dcde-4743-459a-8a21-3bee63df7efe","shortId":"zE9vuT","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 exposes a POST-based portfolio transactions API at `/api/v1/portfolios/14/transactions`, gated behind the x402 payment protocol. Each call costs up to $0.02 USDC (maxAmountRequired of 20,000 base units with 6 decimals) settled on the Base network. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request. However, the specific endpoint being listed here (`/portfolios/14/transactions`) is not explicitly documented on the site's landing page among the advertised APIs. Its exact input schema and response format are unknown — the x402 challenge confirms it accepts POST requests with `application/json` content type, but no further documentation or OpenAPI spec was found.\n\nThe x402 challenge is live and well-formed, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The timeout is 300 seconds. Because the endpoint path references a specific portfolio ID (14) and \"transactions,\" it likely returns or creates transaction records for that portfolio, but this is inference only.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","portfolio-transactions","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request API","crypto payment API"],"warnings":["The endpoint /api/v1/portfolios/14/transactions is not listed among the site's advertised APIs — its purpose and schema are unknown.","No OpenAPI spec, request schema, or response examples are available.","Documentation pages (/docs, /pricing, /README, /api) returned no meaningful content beyond 'Connect wallet'.","The hardcoded portfolio ID '14' in the path suggests this may be a specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/14/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/14/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payments. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the specific endpoint path (/portfolios/14/transactions) is not listed among the site's advertised APIs. The crawled docs/pricing/README pages returned only 'Connect wallet' with no useful 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'/portfolios/14/transactions':130 '0.02':54,120 '000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':187 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':190 '14':207 '20':58 '300':196 '6':63 'Base network API' 'USDC micropayment API' 'accept':159 'address':186 'advertis':102,143 'ai':109 'among':141 'analyt':108 'api':40,71,104,144 'application/json':163 'attach':80 'base':8,22,37,60,68,192 'base-network' 'behind':44 'broader':98 'call':12,26,50 'caller':78 'categori':105 'challeng':156,177 'confirm':157 'content':164 'cost':51 'creat':214 'crypto payment API' 'data':107 'decim':64 'document':134,169 'endpoint':6,20,30,93,126,200 'exact':146 'explicit':133 'expos':33 'financ':112 'form':183 'format':151 'found':174 'gate':3,17,43 'header':85 'howev':123 'id':206 'includ':106 'infer':223 'infrastructur':115 'input':147 'key':72 'land':139 'learn':111 'like':211 'limit':75 'list':128 'live':179 'lowpaymentfee' 'lowpaymentfee.com':32,100 'machin':110 'maxamountrequir':56 'multipl':103 'network':69 'no-api-key' 'openapi':171 'page':140 'part':95 'path':201 'pay':10,24,184 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':47,84,90 'per':11,25,121 'platform':99 'portfolio':4,18,38,205,219 'portfolio transactions API' 'portfolio-transactions' 'post':36,160 'post-bas':35 'post-endpoint' 'price':118 'proof':91 'protocol':48 'rate':74 'record':216 'refer':202 'request':122,161 'requir':77 'respons':150 'return':212 'schema':148 'second':197 'settl':65 'simpli':79 'site':137 'spec':172 'specif':125,204 'timeout':194 'transact':5,19,39,209,215 'type':165 'unit':61 'unknown':153 'usdc':14,28,55,189 'usdc-settlement' 'use':188 'util':116 'valid':88 'web3':113 'well':182 'well-form':181 'x':83 'x-payment':82 'x402':2,16,46,89,155,176 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"21f3d817-6ed6-4f68-a2ac-dc35a89e0120","listingId":"dc93dcde-4743-459a-8a21-3bee63df7efe","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/14/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":"2026-04-18T18:52:23.077Z"}],"sources":[{"listingId":"dc93dcde-4743-459a-8a21-3bee63df7efe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/14/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:23.077Z","lastSeenAt":"2026-04-28T06:34:17.524Z"}],"details":{"listingId":"dc93dcde-4743-459a-8a21-3bee63df7efe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/14/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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/14/transactions"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/14/transactions"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or creating transaction records for a specific portfolio","Programmatic portfolio management via pay-per-call access","Agent-driven financial data retrieval without API key provisioning"],"bestFor":["Agents needing keyless, pay-per-call access to portfolio transaction data","Developers experimenting with x402 payment protocol integrations","Automated workflows that need on-demand financial transaction endpoints"],"notFor":["Users who need detailed API documentation or guaranteed schema stability","High-volume bulk data retrieval where per-call pricing is cost-prohibitive","Production systems requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.416Z"},"updatedAt":"2026-04-28T06:34:17.524Z"}}