{"id":"8cdc4923-551e-443f-af8e-9ccbb3fb1c98","shortId":"wU8AQj","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/messages/183` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and is marked as discoverable. The broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, 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).\n\nDocumentation is minimal — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is live (402 challenge confirmed), but the actual behavior behind the paywall and the structure of request bodies and responses remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["llm","data","finance","utility"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","The /api, /pricing, and /README pages are empty (wallet-connect only)","The specific endpoint /api/v1/messages/183 has no description of its actual functionality — 'Premium API Access' is a generic label","No request body or response body schema is documented anywhere","The platform lists many endpoints but none have detailed docs; actual capabilities behind the paywall are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/183","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/183","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, and the landing page lists available APIs with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The actual functionality behind /api/v1/messages/183 is unclear — the 'Premium API Access' label is generic and doesn't describe what the endpoint 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'/api/v1/messages/183':117 '/pricing':208 '/readme':210 '/request':19,38 '0.02':18,37,70,147 '000':136 '0x8335':141 '20':135 '2913':142 '402':246 '6':151 'accept':155 'access':123 'actual':251 'advertis':130,166 'ai':12,31,177 'ai-inference' 'ai/ml':57 'analysi':181 'analyt':56,172 'api':5,24,45,88,122,170 'application/json':126 'attach':99 'avail':237 'base':8,27,78,137,144 'base network api' 'behavior':252 'behind':253 'bodi':261 'broad':50 'broader':164 'call':4,23 'caller':97 'categori':168 'challeng':129,247 'classif':184 'classification' 'collect':51 'commit':96 'confirm':248 'connect':218 'content':223 'convers':201 'conversion' 'cost':133 'crawl':240 'crypto-quotes' 'data':11,30,55,60,171 'data-analytics' 'decim':152 'discover':162 'document':203,232 'embed':185 'embeddings' 'enabl':44 'endpoint':16,35,53,66,115,154,243 'equal':146 'estim':195 'everi':65 'exampl':236 'exchang':190 'export':175 'feed':189 'financ':13,32,186 'finance-data' 'finance/web3':59 'four':167 'gas':194 'general':62 'generat':202 'geocod':199 'geocoding' 'given':148 'header':104 'host':48 'http':156 'infer':58 'infrastructur':197 'insight':176 'key':89 'learn':179 'limit':92 'list':119 'live':245 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':178 'mark':160 'materi':241 'maximum':132 'metric':173 'micropayment api' 'minim':205 'minimum':95 'network':79 'offer':10,29 'openapi':227 'page':211 'pay':2,21 'pay per request api' 'pay-per-cal':1,20 'pay-per-call' 'payment':83,103,108 'paywal':255 'per':3,22,71 'platform':6,25,46,165 'post':157 'premium':121 'price':68,188 'prompt':219 'proof':109 'protocol':84 'quot':193 'rate':91,191 'remain':264 'report':174 'request':72,112,260 'request/response':230 'resolv':213 'respons':263 'return':125 'schema':231 'sentiment':180 'sentiment-analysis' 'servic':64 'settl':73 'simpli':98 'span':54 'spec':228 'specif':114 'structur':258 'summar':183 'text':182 'text-summarization' 'token':192 'unit':138 'unknown':265 'usag':235 'usdc':9,28,75,140,149 'usdc api' 'usdc-base' 'util':15,34,63,198 'valid':107,200 'validation' 'via':80 'wallet':217 'wallet-connect':216 'web3':187 'x':102 'x-payment':101 'x402':43,82,128 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b7cd2df1-0ef7-484c-98ad-318441998490","listingId":"8cdc4923-551e-443f-af8e-9ccbb3fb1c98","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/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.727Z"}],"sources":[{"listingId":"8cdc4923-551e-443f-af8e-9ccbb3fb1c98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.727Z","lastSeenAt":"2026-04-22T09:02:19.071Z"}],"details":{"listingId":"8cdc4923-551e-443f-af8e-9ccbb3fb1c98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/183 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The 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":"The x402 challenge for /api/v1/messages/183 specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/183"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Accessing utility services like geocoding, validation, and data conversion with instant crypto-settled payments"],"bestFor":["Agents or bots that need keyless, on-demand API access paid per call","Developers prototyping with multiple API categories without subscription commitments","Crypto-native workflows that can settle USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.652Z"},"updatedAt":"2026-04-22T09:02:19.071Z"}}