{"id":"04f2c158-37b3-4bfb-9c0b-5cefc1cbe8c4","shortId":"jQwdgc","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 API for portfolio transactions at `/api/v1/portfolios/38/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 payment protocol on the Base network, settled in USDC.\n\nThe specific endpoint probed here returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually accepts or returns. The endpoint path suggests it manages or retrieves transactions for a specific portfolio (ID 38), but the exact input format and output structure are unknown. The platform's landing page confirms the $0.02/request pricing and lists many other endpoints, but provides no technical documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-transactions","post-api"],"categories":["finance","payments"],"synonyms":["portfolio transactions API","x402 USDC endpoint","pay-per-call API","Base network API","lowpaymentfee","crypto payment API","web3 API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request and response formats are completely unknown","The endpoint path references a specific portfolio ID (38); it is unclear whether this is a demo or a fixed resource","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/38/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/38/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 and returns a valid x402 challenge, but there is zero documentation: no OpenAPI schema, no request/response examples, no description of what the endpoint does beyond its URL path. The docs pages are empty. This is effectively a stub 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'/api/v1/portfolios/38/transactions':43 '/docs':157 '/pricing':159 '/readme':161 '/request':228 '0.02':108,227 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':123 '20':102 '38':209 '402':96 '6':113 'Base network API' 'accept':192 'access':137 'actual':191 'address':122 'advertis':128 'ai/ml':64 'analyt':63 'api':38,60,130 'attach':140 'base':8,22,37,80,104,125 'base-network' 'broader':49 'call':12,26 'caller':138 'challeng':94 'confirm':225 'connect':167 'content':173 'crypto payment API' 'data':62,67 'decim':114 'descript':184 'document':152,239 'dozen':54 'endpoint':6,20,30,87,190,196,234 'exact':212 'exampl':181 'expos':33 'extrem':154 'finance/web3':66 'format':214 'gate':3,17,72 'header':145 'http':95 'id':208 'infer':65 'input':213 'instant':136 'key':131 'land':223 'limit':134 'list':231 'lowpaymentfee' 'lowpaymentfee.com':32,51 'manag':200 'mani':232 'network':81 'offer':53 'openapi':177 'output':216 'page':162,224 'part':46 'path':197 'pay':10,24,57 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':56 'payment':76,98,118,144,150 'per':11,25,58,115 'platform':50,127,221 'portfolio':4,18,40,188,207 'portfolio transactions API' 'portfolio-transactions' 'post':36 'post-api' 'post-bas':35 'price':229 'probe':88 'prompt':169 'proof':151 'protocol':77 'provid':236 'rate':133 'render':164 'request':59,97,116 'request/response':180 'retriev':202 'return':90,194 'schema':178 'sent':120 'servic':70 'settl':82 'simpli':139 'sinc':110 'span':61 'spars':155 'specif':86,206 'structur':217 'suggest':198 'technic':238 'transact':5,19,41,189,203 'unit':105 'unknown':219 'usd':109 'usdc':14,28,84,107,111 'usdc-settlement' 'use':112 'util':69 'valid':92,148 'via':73 'wallet':168 'web3 API' 'x':143 'x-payment':142 'x402':2,16,75,93,149 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fb08e35f-8039-4dcd-8a4e-915f68d7546c","listingId":"04f2c158-37b3-4bfb-9c0b-5cefc1cbe8c4","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/38/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":"2026-04-18T18:52:39.916Z"}],"sources":[{"listingId":"04f2c158-37b3-4bfb-9c0b-5cefc1cbe8c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/38/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.916Z","lastSeenAt":"2026-04-23T05:01:29.102Z"}],"details":{"listingId":"04f2c158-37b3-4bfb-9c0b-5cefc1cbe8c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/38/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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38/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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/38/transactions"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Submitting or retrieving portfolio transaction records via a pay-per-call model","Integrating x402-gated financial data into agent workflows without API key management","Programmatic access to portfolio transaction data settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost micro-transactions for financial data"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.563Z"},"updatedAt":"2026-04-23T05:01:29.102Z"}}