{"id":"6d230b1c-0111-42c0-a8b6-94c82ccae5cc","shortId":"e2TqDb","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 an x402 payment-gated POST request. The specific resource `/api/v1/portfolios/89/transactions` is part of a broader platform that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint accepts POST and returns application/json.\n\nThe specific data returned by this particular portfolio transactions endpoint is not documented in the crawled material. The site's docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content, so the request/response schemas are unknown. The endpoint appears to be one of many on the platform, all priced uniformly at $0.02 per call.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call finance API","crypto portfolio data"],"warnings":["No request or response schema is documented; the input/output format is unknown.","The docs, pricing, and API pages on the site render only a 'Connect wallet' prompt with no usable documentation.","The specific meaning of portfolio ID 89 is unexplained — it may be a demo or placeholder resource.","This endpoint's purpose ('Premium API Access') is generic and does not describe the actual data returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/89/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/89/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or what 'portfolios/89/transactions' actually returns. The docs pages are empty beyond a wallet-connect prompt, making integration difficult without trial and 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'0.02':116,209 '000':111 '0x8335':101 '20':110 '2913':102 '6':121 'Base network API' 'USDC micropayment API' 'accept':93,147 'access':34 'advertis':130 'ai/ml':69 'amount':108 'analyt':68 'api':65,124,175 'appear':196 'application/json':151 'attach':133 'base':8,22,80,104,112 'base-network' 'broader':55 'call':12,26,211 'caller':131 'challeng':86 'confirm':87 'connect':181 'content':187 'contract':100 'crawl':167 'crypto':72 'crypto portfolio data' 'data':38,67,154 'decim':122 'doc':172 'document':164 'dozen':59 'endpoint':6,20,30,89,146,161,195 'equal':115 'exact':95 'exact-schem':94 'financ':71 'gate':3,17,44 'header':138 'infer':70 'json-response' 'key':125 'limit':128 'live':91 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':201 'materi':168 'maximum':107 'network':81 'no-api-key' 'offer':58 'one':199 'page':176 'part':52 'particular':158 'pay':10,24,62 'pay-per-cal':9,23 'pay-per-call finance API' 'pay-per-request':61 'payment':43,97,137,143 'payment-g':42 'per':11,25,63,117,210 'platform':56,204 'portfolio':4,18,36,159 'portfolio transactions API' 'portfolio-transactions' 'post':45,148 'price':173,206 'prompt':183 'proof':144 'provid':33 'rate':127 'render':178 'request':46,64,118 'request/response':190 'resourc':49 'return':150,155 'schema':191 'scheme':96 'servic':75 'settl':77 'simpli':132 'site':170 'span':66 'specif':48,153 'transact':5,19,37,160 'uniform':207 'unit':113 'unknown':193 'usdc':14,28,83,99,119 'usdc-settlement' 'use':82,120 'util':74 'valid':141 'via':39 'wallet':182 'x':136 'x-payment':135 'x402':2,16,41,85,142 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5ae46e42-c326-4931-9a36-6e3346134ae9","listingId":"6d230b1c-0111-42c0-a8b6-94c82ccae5cc","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/89/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":"2026-04-18T18:53:44.714Z"}],"sources":[{"listingId":"6d230b1c-0111-42c0-a8b6-94c82ccae5cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/89/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:44.714Z","lastSeenAt":"2026-04-27T14:05:19.607Z"}],"details":{"listingId":"6d230b1c-0111-42c0-a8b6-94c82ccae5cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/89/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89/transactions"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/89/transactions"}],"useCases":["Fetching transaction history for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call USDC payments"],"bestFor":["Developers who want keyless, pay-per-request access to portfolio data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.421Z"},"updatedAt":"2026-04-27T14:05:19.607Z"}}