{"id":"d17ceed6-99df-426c-ae35-20dfa21ae9ce","shortId":"DFy4qs","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 `/api/v1/messages/91` 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 at `/api/v1/messages/91` returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. Note that the specific functionality of the `/messages/91` endpoint is unclear — it does not correspond to any of the documented API categories on the landing page, and no request/response schema documentation was found.","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","micropayment api","pay per call","usdc api","base network api","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available for this endpoint","The /messages/91 path does not match any of the documented API categories on the landing page — its purpose is unclear","Crawled documentation pages (/api, /pricing, /README) returned no useful content","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /messages/91 endpoint — no request schema, no response schema, no examples. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'/messages/91':191 '/request':11,26 '0.02':10,25,56,137,165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':178 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':158 '20000':153 '300':181 '6':161 'accept':168 'access':42,83 'advertis':93 'ai':105 'analysi':109 'analyt':99 'api':5,20,38,65,82,97,204 'application/json':173 'base':8,23,61,154,160 'base network api' 'broad':45 'call':4,19,54 'categori':95,205 'challeng':149 'classif':112 'convers':129 'correspond':198 'cost':55 'data':98,102 'decim':162 'document':203,214 'embed':113 'endpoint':48,76,132,142,167,192 'equal':164 'estim':123 'exchang':118 'export':103 'feed':117 'financ':114 'follow':85 'found':216 'four':94 'function':188 'gas':122 'gate':41 'generat':130 'geocod':127 'infrastructur':125 'insight':104 'json-api' 'key':66 'land':208 'learn':107 'limit':69 'list':79 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':106 'maxamountrequir':151 'metric':100 'micropayment api' 'network':9,24,62 'no-api-key' 'note':184 'page':209 'pattern':90 'pay':2,17,35 'pay per call' 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,89,174 'per':3,18,36,138 'platform':6,21,39,92 'post':169 'post-method' 'premium':81 'price':116,134 'probe':141 'protocol':52 'quot':121 'rate':68,119 'report':101 'request':37,139,170 'request/response':212 'requir':73 'return':145,172 'schema':213 'second':182 'sent':176 'sentiment':108 'set':46 'specif':75,187 'subscript':72 'summar':111 'text':110 'timeout':183 'token':120 'unclear':194 'uniform':135 'unit':155 'usdc':14,29,58,157 'usdc api' 'usdc-base' 'use':49 'util':126 'valid':128,147 'via':12,27 'web3':115 'x402':13,28,51,88,148 'x402 api' 'x402-payment'","prices":[{"id":"606925a6-0e70-4fab-b70c-4610de801f49","listingId":"d17ceed6-99df-426c-ae35-20dfa21ae9ce","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.615Z"}],"sources":[{"listingId":"d17ceed6-99df-426c-ae35-20dfa21ae9ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.615Z","lastSeenAt":"2026-04-22T02:32:08.770Z"}],"details":{"listingId":"d17ceed6-99df-426c-ae35-20dfa21ae9ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/91 \\\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":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returned maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/91"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.192Z"},"updatedAt":"2026-04-22T02:32:08.770Z"}}