{"id":"fc51681b-e910-46fa-85d9-772ab7976d72","shortId":"3utmpA","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/messages/196` is labeled \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nThe probed endpoint returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base), which equals $0.02 (USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/messages/196 is undocumented","Subpages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The broad range of advertised API categories (AI, finance, data, infrastructure) could not be verified — no response examples or detailed docs exist","Unknown what 'messages/196' refers to — could be a specific message resource or a generic endpoint ID"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/196","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/messages/196","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no example responses, and the specific purpose of `/api/v1/messages/196` is entirely unclear. The crawled subpages (/api, /pricing, /README) returned no useful content. This is effectively a stub 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'/api/v1/messages/196':79 '/pricing':195 '/readme':197 '/request':11,26 '0.02':10,25,57,137,161 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x8335':156 '20000':151 '6':164 'accept':174 'access':42,84 'address':170 'advertis':94 'ai':106 'analysi':110 'analyt':100 'api':5,20,38,66,83,98 'application/json':179 'base':8,23,62,152,158 'base network api' 'broad':45 'call':4,19,55 'categori':96 'challeng':147 'classif':113 'connect':203 'content':209 'convers':130 'cost':56 'crawl':192 'data':99,103 'decim':165 'detail':183 'document':184 'embed':114 'endpoint':48,77,133,142,173 'equal':160 'estim':124 'exampl':186 'exchang':119 'export':104 'feed':118 'financ':115 'follow':86 'found':189 'four':95 'gas':123 'gate':41 'generat':131 'geocod':128 'infrastructur':126 'insight':105 'json-api' 'key':67 'label':81 'learn':108 'limit':70 'list':135 'low payment fee' 'lowpaymentfee.com':31 'machin':107 'maxamountrequir':149 'metric':101 'micropayment api' 'network':9,24,63 'no-api-key' 'openapi':181 'page':198 'pattern':91 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,52,90,166 'per':3,18,36,138 'platform':6,21,39,93 'post':175 'post-method' 'premium':82 'premium api access' 'price':117 'probe':141 'prompt':205 'protocol':53 'quot':122 'rate':69,120 'report':102 'request':37,139,176 'requir':74 'respons':187 'return':143,178,200 'schema':182 'sent':168 'sentiment':109 'set':46 'specif':76 'subscript':73 'substant':208 'summar':112 'text':111 'token':121 'unit':153 'usdc':14,29,59,155,162 'usdc api' 'usdc-base' 'use':49,163 'util':127 'valid':129,145 'via':12,27 'wallet':204 'web3':116 'x402':13,28,51,89,146 'x402 api' 'x402-payment'","prices":[{"id":"4b784adb-6d82-4f0f-9d1d-889d15a65b10","listingId":"fc51681b-e910-46fa-85d9-772ab7976d72","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/messages/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.438Z"}],"sources":[{"listingId":"fc51681b-e910-46fa-85d9-772ab7976d72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.438Z","lastSeenAt":"2026-04-22T02:32:07.049Z"}],"details":{"listingId":"fc51681b-e910-46fa-85d9-772ab7976d72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/196 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/196","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per 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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/196"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a generic pay-per-call API endpoint without needing API keys or subscriptions","Making micropayment-gated HTTP requests settled in USDC on Base","Integrating agent-driven workflows that pay per request via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.012Z"},"updatedAt":"2026-04-22T02:32:07.049Z"}}