{"id":"98e5a65d-5e13-49f5-a86a-6f0e740054ec","shortId":"CGUXzm","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 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/129` is listed as \"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 priced uniformly at $0.02 per request.\n\nThe probed endpoint (`/api/v1/messages/129`) returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. Note that this specific path (`/messages/129`) does not clearly map to any of the advertised API categories on the landing page, so its exact functionality is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/messages/129 path does not correspond to any of the advertised API categories on the landing page — its actual functionality is unclear","No request body schema or response examples are available","Crawled /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/129","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/129","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 for the /messages/129 path, no request/response examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The specific functionality of this endpoint is 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'/messages/129':185 '/request':11,26 '0.02':10,25,56,138,165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':158 '20000':153 '6':161 'Base network API' 'USDC API access' 'accept':174 'access':42,84 'address':170 'advertis':94,194 'ai':106 'analysi':110 'analyt':100 'api':5,20,38,65,83,98,195 'application/json':179 'base':8,23,61,154,160 'broad':45 'call':4,19,54 'categori':96,196 'challeng':149 'classif':113 'clear':188 'convers':130 'cost':55 'crypto-paid API' 'data':99,103 'decim':162 'embed':114 'endpoint':48,76,133,143,173 'equal':164 'estim':124 'exact':203 'exchang':119 'export':104 'feed':118 'financ':115 'follow':86 'four':95 'function':204 'gas':123 'gate':41 'generat':131 'geocod':128 'http-post' 'infrastructur':126 'insight':105 'json-response' 'key':66 'land':199 'learn':108 'limit':69 'list':80 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':107 'map':189 'maxamountrequir':151 'metric':101 'micropayment API' 'network':9,24,62 'no-api-key' 'no-rate-limit' 'note':180 'page':200 'path':184 'pattern':91 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':34 'payment':15,30,90,166 'per':3,18,36,139 'platform':6,21,39,93 'post':175 'premium':82 'price':117,135 'probe':142 'protocol':52 'quot':122 'rate':68,120 'report':102 'request':37,140,176 'requir':73 'return':145,178 'sent':168 'sentiment':109 'set':46 'specif':75,183 'subscript':72 'summar':112 'text':111 'token':121 'unclear':206 'uniform':136 'unit':155 'usdc':14,29,58,157 'usdc-base' 'use':49 'util':127 'valid':129,147 'via':12,27 'web3':116 'x402':13,28,51,89,148 'x402 API' 'x402-payment'","prices":[{"id":"d106e42d-bbb4-461b-843e-62ef2ad64b26","listingId":"98e5a65d-5e13-49f5-a86a-6f0e740054ec","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/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.622Z"}],"sources":[{"listingId":"98e5a65d-5e13-49f5-a86a-6f0e740054ec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.622Z","lastSeenAt":"2026-04-22T02:32:05.673Z"}],"details":{"listingId":"98e5a65d-5e13-49f5-a86a-6f0e740054ec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/129 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/129 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/129"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without managing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use data or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.302Z"},"updatedAt":"2026-04-22T02:32:05.673Z"}}