{"id":"dcb046f6-66c5-4742-8ee3-47a35bf78c80","shortId":"TtR33L","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request at $0.02 each using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request, and the server fulfills the call once payment is verified.\n\nThe specific endpoint at `/api/v1/transactions/46` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base network with a 300-second timeout.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so the actual behavior, input schemas, and response formats of individual endpoints remain undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","post-endpoint","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API billing"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no usable content — only a wallet-connect prompt","No OpenAPI or schema available; request and response formats for this endpoint are unknown","The specific function of /api/v1/transactions/46 ('Premium API Access') is not explained anywhere in the crawled material","The broader platform lists many endpoint categories but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/46","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/transactions/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty wallet-connect stubs. The purpose of this specific '/transactions/46' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/request':13,28 '0.02':12,27,64,145 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':138 '20':131 '300':160 '6':141 'Base network API' 'USDC API' 'accept':121 'access':119 'actual':212 'address':152 'advertis':127,166 'ai-inference' 'ai/ml':49 'analysi':175 'analyt':48 'api':5,20,37,74,118 'asset':137 'attach':91 'base':8,23,70,133,156 'behavior':213 'broad':42 'broader':164 'call':4,19,104,147 'caller':90 'catalog':43 'categori':167 'challeng':126 'classif':178 'commit':82 'connect':204 'content':209 'convers':190 'crawl':226 'crypto-paid API' 'data':47,52,171 'data-analytics' 'decim':142 'doc':196 'document':194 'embed':179 'enabl':36 'endpoint':45,57,111,221 'equat':143 'estim':187 'exchang':182 'export':172 'feed':181 'finance-data' 'finance/web3':51 'format':218 'fulfil':102 'gas':186 'generat':192 'geocod':188 'handl':87 'header':94 'howev':193 'http':97 'includ':168 'individu':220 'infer':50 'inlin':89 'input':214 'insight':173 'key':75 'limit':78 'list':115 'low fee API' 'lowpaymentfee.com':31 'materi':227 'maxamountrequir':129 'metric':169 'micropayment API' 'minimum':81 'network':9,24,71,157 'no-api-key' 'no-rate-limit' 'offer':40 'page':195 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':88,93,106,148 'per':3,18,61,146 'per-request':60 'per-request-billing' 'platform':6,21,38,165 'post':122 'post-endpoint' 'premium':117 'price':180,197 'prompt':205 'protocol':86 'quot':185 'rate':77,183 'readm':198 'remain':222 'report':170 'request':62,98,123 'requir':83 'respons':217 'return':199 'schema':215 'second':161 'sent':150 'sentiment':174 'server':101 'serverless API billing' 'servic':55 'span':46 'specif':110 'substant':208 'summar':177 'text':176 'timeout':162 'token':184 'undocu':223 'unit':134 'usdc':15,30,67,136 'usdc-base-network' 'use':66 'util':54 'utility-services' 'valid':189 'verifi':108 'via':10,25 'wallet':203 'wallet-connect':202 'x402':11,26,35,85,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d3582720-64a6-4737-8acb-226120fcbe59","listingId":"dcb046f6-66c5-4742-8ee3-47a35bf78c80","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/transactions/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:44.807Z"}],"sources":[{"listingId":"dcb046f6-66c5-4742-8ee3-47a35bf78c80","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:44.807Z","lastSeenAt":"2026-04-22T18:32:36.567Z"}],"details":{"listingId":"dcb046f6-66c5-4742-8ee3-47a35bf78c80","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/46 \\\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":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/46"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only wallet-connect prompts with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand access to analytics, AI, or financial data without managing API keys or subscriptions","Programmatic access to sentiment analysis, text summarization, classification, or embeddings at $0.02/call","Fetching real-time crypto gas estimates, token quotes, or exchange rates with inline USDC payment","Geocoding, data validation, or format conversion as a utility microservice"],"bestFor":["AI agents and bots that can settle x402 payments in USDC on Base","Developers who want zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful"],"notFor":["High-volume workloads where per-call pricing at $0.02 adds up quickly","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing detailed API documentation — current docs are essentially empty"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.078Z"},"updatedAt":"2026-04-22T18:32:36.567Z"}}