{"id":"e7396de8-1792-4fff-b43d-3b70fc54c653","shortId":"QPsUBR","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint probed (/api/v1/messages/123) is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe site organizes its APIs into four categories: 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 listed endpoints share the same $0.02/request pricing. The probed endpoint (/api/v1/messages/123) does not clearly map to any of these advertised categories, so its exact functionality is uncertain — it may be a messaging or notification endpoint, or simply a demo/test resource.\n\nNo OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. This makes it difficult to determine input parameters, response formats, or the actual behavior of any endpoint. The platform is live and the x402 challenge is well-formed, but the lack of documentation is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","402 payment api"],"warnings":["No API documentation, OpenAPI spec, or example payloads found — endpoint behavior must be guessed","The probed endpoint /api/v1/messages/123 does not match any of the advertised API categories on the landing page; its actual functionality is unknown","All secondary pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","Response format and input schema are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/123","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/123","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 well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no documentation, no example responses, and the specific endpoint's purpose is unclear. The crawled pages beyond the landing page returned only wallet-connect prompts with no useful 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'/api/v1/messages/123':69,174 '/pricing':219 '/readme':221 '/request':19,38,169 '0.02':18,37,92,168 '000':86 '20':85 '402':80 '402 payment api' 'access':75,106 'actual':246 'advertis':97,183 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':130 'api':5,24,45,74,99,125 'attach':109 'base':8,27,63,87 'base network api' 'behavior':247 'broad':50 'call':4,23,94 'caller':107 'catalog':51 'categori':128,184 'challeng':81,258 'classif':143 'clear':177 'connect':227 'content':233 'convers':160 'cover':10,29 'crawl':216 'data':11,30,129,133 'data-analytics' 'demo/test':202 'detail':207 'determin':239 'difficult':237 'document':208,267 'embed':144 'embeddings' 'enabl':44 'endpoint':16,35,57,67,164,173,198,250 'estim':154 'exact':187 'exampl':210 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'finance-data' 'form':262 'format':243 'found':214 'four':127 'function':188 'gap':271 'gas':153 'generat':161 'geocod':158 'geocoding' 'header':114 'i.e':91 'infrastructur':156 'input':240 'insight':135 'instant':105 'key':100 'lack':265 'learn':138 'limit':103 'list':71,163 'live':254 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'make':235 'map':178 'may':192 'messag':195 'metric':131 'micropayment api' 'network':64 'no-api-key' 'notif':197 'offer':48 'openapi':205 'organ':123 'page':222 'paramet':241 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':212 'payment':113,119 'per':3,22,55,93 'platform':6,25,46,96,252 'premium':73 'price':147,170 'probe':68,172 'prompt':229 'proof':120 'quot':152 'rate':102,150 'report':132 'request':56,82 'request/response':211 'resourc':203 'respons':242 'return':77,224 'schema':206 'sentiment':139 'sentiment-analysis' 'serverless api' 'settl':58 'share':165 'signific':270 'simpli':108,200 'site':122 'specif':66 'substant':232 'summar':142 'text':141 'text-summarization' 'token':151 'uncertain':190 'unit':88 'usdc':9,28,60,90 'usdc api' 'usdc-base-network' 'util':15,34,157 'utility-apis' 'valid':79,117,159 'wallet':228 'web3':146 'well':261 'well-form':260 'x':112 'x-payment':111 'x402':43,118,257 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6c6d295d-309f-469d-b750-f763c6a9b7ce","listingId":"e7396de8-1792-4fff-b43d-3b70fc54c653","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.674Z"}],"sources":[{"listingId":"e7396de8-1792-4fff-b43d-3b70fc54c653","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.674Z","lastSeenAt":"2026-04-22T07:02:09.284Z"}],"details":{"listingId":"e7396de8-1792-4fff-b43d-3b70fc54c653","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/123"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/123"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without subscription commitments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) on a per-call basis","Geocoding addresses or validating/converting data via utility endpoints","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Developers wanting zero-setup, keyless API access with crypto micropayments","Agents or bots that need on-demand AI or data endpoints without account registration","Projects on the Base network looking for USDC-settled API services"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing rather than per-call fees","Developers without access to USDC on Base for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.184Z"},"updatedAt":"2026-04-22T07:02:09.284Z"}}