{"id":"0eaeb17c-84ab-43cb-b816-4359fe083102","shortId":"e9wbqU","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 the x402 payment protocol. The specific resource `/api/v1/portfolios/2/transactions` accepts POST requests and is gated behind a per-call USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site-wide pricing of $0.02/request advertised on the provider's landing page.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all at the same $0.02/call price point. This particular endpoint falls under a \"portfolios\" resource path, suggesting it returns or creates transaction records associated with a specific portfolio (portfolio ID 2). However, the exact request body schema and response format are not documented in the crawled material; the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content.\n\nPayment settles in USDC (contract 0x8335…2913) on Base to address 0x1A2B…85F3. The x402 challenge uses the \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised — access is purely pay-per-request via the x402 payment header. The endpoint is live and returning a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-on-base","portfolio-transactions","pay-per-call","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 portfolio endpoint","USDC pay-per-call API","lowpaymentfee portfolio","Base network API","crypto payment API","transaction data endpoint"],"warnings":["No request body schema or response schema documented — the exact purpose and data format of this endpoint are unknown.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no further content.","Portfolio ID '2' is hardcoded in the path; unclear if other portfolio IDs are valid or how they are obtained.","The provider's catalog lists many diverse endpoints (AI, finance, utilities) all at $0.02 — it is unclear whether these are fully functional or placeholder/demo endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/2/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/2/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 402 challenge, but there is no documentation of the request body schema, response format, or what 'portfolios/2/transactions' actually returns. The docs, pricing, and API pages all render only a wallet-connect prompt with no usable content. This is effectively a stub 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'/call':126 '/request':92 '0.02':79,91,125 '000':74 '0x1a2b':197 '0x8335':191 '2':152 '20':73 '2913':192 '300':208 '402':239 '85f3':198 'Base network API' 'USDC pay-per-call API' 'accept':48 'access':34,219 'address':196 'advertis':93,218 'ai/ml':115 'analyt':114 'api':111,173,212 'associ':145 'base':8,22,63,75,194 'behind':54 'bodi':157 'broad':105 'call':12,26,58 'catalog':106 'challeng':67,201,240 'connect':179 'consist':83 'content':185 'contract':190 'cost':71 'crawl':167 'creat':142 'crypto payment API' 'data':38,113 'doc':170 'document':164 'endpoint':6,20,30,131,232 'exact':155,204 'fall':132 'finance/web3':117 'format':161 'gate':3,17,53,110 'header':230 'host':103 'howev':153 'id':151 'indic':68 'infer':116 'infrastructur':119 'key':213 'land':98 'limit':216 'live':234 'lowpaymentfee portfolio' 'lowpaymentfee.com':32,102 'materi':168 'maximum':70 'network':64 'no-api-key' 'page':99,174 'particular':130 'path':137 'pay':10,24,223 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request':222 'payment':42,60,186,229 'per':11,25,57,81,224 'per-cal':56 'point':128 'portfolio':4,18,36,135,149,150 'portfolio transactions API' 'portfolio-transactions' 'post':49 'post-endpoint' 'price':89,127,171 'prompt':181 'protocol':43 'provid':33,96,101 'pure':221 'rate':215 'record':144 'render':176 'request':50,82,156,225 'resourc':46,136 'respons':160 'return':140,236 'schema':158 'scheme':205 'second':209 'settl':187 'site':87 'site-wid':86 'span':112 'specif':45,148 'suggest':138 'timeout':210 'transact':5,19,37,143 'transaction data endpoint' 'unit':76 'usd':80 'usdc':14,28,59,78,189 'usdc-on-base' 'use':202 'util':120 'valid':238 'via':39,226 'wallet':180 'wide':88 'x402':2,16,41,66,109,200,228 'x402 portfolio endpoint' 'x402-gated':1,15,108 'x402-payment'","prices":[{"id":"20d2daf2-97b9-4ee4-85d3-8093b25422ee","listingId":"0eaeb17c-84ab-43cb-b816-4359fe083102","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/2/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":"2026-04-18T18:52:26.677Z"}],"sources":[{"listingId":"0eaeb17c-84ab-43cb-b816-4359fe083102","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/2/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:26.677Z","lastSeenAt":"2026-04-28T05:04:34.760Z"}],"details":{"listingId":"0eaeb17c-84ab-43cb-b816-4359fe083102","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/2/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 of USDC on Base (0.02 USD per call)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/transactions"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/transactions"}],"useCases":["Retrieving or creating transaction records for a specific portfolio","Integrating pay-per-call portfolio data into automated trading or analytics pipelines","Agent-driven portfolio management where each data fetch is individually settled on-chain"],"bestFor":["Developers wanting keyless, pay-per-request access to portfolio transaction data","AI agents that can settle USDC payments on Base autonomously","Prototyping or low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call crypto settlement overhead matters","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.214Z"},"updatedAt":"2026-04-28T05:04:34.760Z"}}