{"id":"a4d6764c-a064-46b8-b344-05b9e262addc","shortId":"vXLMsA","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/9/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 max amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys are needed; callers authenticate purely through the x402 payment header. The platform advertises no rate limits and instant access.\n\nThe specific functionality of this particular endpoint — portfolio transactions for portfolio ID 9 — is not well-documented. The landing page lists many API categories but does not include this specific route among its featured endpoints. It may be a portfolio-specific transaction log or a way to create/query transactions within a portfolio context. Without further documentation or example responses, the exact request body schema and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","post-api","no-api-key","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call API","crypto payment endpoint"],"warnings":["No documentation available for this specific endpoint (/api/v1/portfolios/9/transactions) — its purpose and schema are unknown","The endpoint references a hardcoded portfolio ID (9); unclear if other portfolio IDs are available or how they are created","All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content","No OpenAPI spec, no example requests or responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/9/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/9/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint — no request schema, no response examples, no description of what portfolio 9 transactions actually returns. The crawled docs/pricing/README pages all rendered as just 'Connect wallet' with no useful 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'0.02':10,24,75,108 '000':101 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':100 '6':111 '9':147 'Base network API' 'USDC micropayment API' 'access':34,134 'advertis':128 'ai/ml':65 'among':167 'amount':95 'analyt':64 'api':61,114,158 'authent':119 'base':8,22,87,102 'base-network' 'bodi':199 'broader':50 'call':98 'caller':118 'categori':159 'context':189 'contract':91 'create/query':184 'crypto payment endpoint' 'data':38,63,68 'decim':112 'document':152,192 'endpoint':6,20,30,141,170 'equal':107 'exact':197 'exampl':194 'featur':169 'finance/web3':67 'format':203 'function':137 'gate':3,17,60 'handl':80 'header':125 'id':146 'includ':163 'infer':66 'infrastructur':70 'instant':133 'key':115 'land':154 'limit':131 'list':156 'log':179 'lowpaymentfee' 'lowpaymentfee.com':32,52 'mani':157 'max':94 'may':172 'need':117 'network':88 'no-api-key' 'offer':54 'page':155 'part':47 'particular':140 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':78,124 'per':11,25,76,97 'platform':51,127 'portfolio':4,18,36,142,145,176,188 'portfolio transactions API' 'portfolio-specif':175 'portfolio-transactions' 'post':41 'post-api' 'price':73 'protocol':84 'provid':33 'pure':120 'rate':130 'remain':204 'request':12,26,42,77,198 'requir':96 'respons':195,202 'rout':166 'schema':200 'span':62 'specif':136,165,177 'transact':5,19,37,143,178,185 'unit':103 'unknown':205 'usdc':14,28,90,105,109 'usdc-settlement' 'use':89,110 'util':71 'varieti':56 'via':39,81 'way':182 'well':151 'well-docu':150 'within':186 'without':190 'x402':2,16,59,83,123 'x402 paid API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"b259dbd5-57af-404a-b9ad-cb1771f970ac","listingId":"a4d6764c-a064-46b8-b344-05b9e262addc","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/9/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":"2026-04-18T18:53:43.472Z"}],"sources":[{"listingId":"a4d6764c-a064-46b8-b344-05b9e262addc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/9/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:43.472Z","lastSeenAt":"2026-04-27T14:05:19.555Z"}],"details":{"listingId":"a4d6764c-a064-46b8-b344-05b9e262addc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/9/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/9/transactions"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/9/transactions"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying or creating transactions within a specific portfolio","Integrating portfolio transaction data into automated trading or analytics pipelines","Agent-driven portfolio management where per-call payment replaces subscription billing"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that need to autonomously purchase API calls without pre-registration","Users who want low-cost micro-transactions without subscription commitments"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone who cannot transact on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.541Z"},"updatedAt":"2026-04-27T14:05:19.555Z"}}