{"id":"ed80aaf4-e228-45e2-8d02-01de0bf04a07","shortId":"wL4Lme","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 exposes a broad collection of endpoints across 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/119` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the payTo address. The endpoint returns application/json and has a max timeout of 300 seconds.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind the `/api/v1/messages/119` path is unclear; it does not map to any of the named endpoints listed on the homepage. Agents should treat this as a live but under-documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","on-demand API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The path /api/v1/messages/119 does not correspond to any named endpoint on the homepage — its actual functionality is unknown","All documentation routes (/api, /pricing, /README) return only a wallet-connect prompt with no content","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/119","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific /api/v1/messages/119 path is not described anywhere on the site. Documentation pages return only wallet-connect prompts. Effectively a stub 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'/api/v1/messages/119':123,228 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,95,155 '000':141 '0x8335':147 '20':140 '2913':148 '300':178 '6':151 'Base network API' 'USDC micropayment API' 'accept':130 'access':128 'across':54 'actual':224 'addit':203 'address':167 'advertis':136 'agent':246 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':171 'asset':146 'avail':218 'base':8,27,103,142,150 'behind':226 'beyond':181 'broad':50 'call':4,23 'categori':56 'challeng':135 'classif':71 'classification' 'collect':51 'commit':118 'connect':199 'content':204 'convers':88 'crawl':221 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':152 'document':180,213,256 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,169,241,257 'equal':154 'estim':82 'exact':162 'exampl':217 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':225 'gas':81 'generat':89 'geocod':86 'geocoding' 'homepag':245 'infrastructur':84 'insight':63 'key':111 'label':125 'land':183 'learn':66 'limit':114 'list':242 'live':252 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':158 'map':235 'materi':222 'max':175 'maxamountrequir':138 'metric':59 'name':240 'network':104 'offer':10,29 'on-demand API' 'openapi':208 'page':184 'paid':98 'path':229 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':156 'payto':166 'per':3,22,96 'platform':6,25,46 'post':131 'premium':126 'price':75,93 'prompt':200 'protocol':108 'quot':80 'rate':78,113 'report':60 'request':97,132 'request/response':211 'resolv':194 'return':170 'rout':192 'schema':212 'scheme':163 'second':179 'sentiment':67 'sentiment-analysis' 'spars':186 'spec':209 'specif':120 'summar':70 'text':69 'text-summarization' 'timeout':176 'token':79 'treat':248 'unclear':231 'under-docu':254 'unit':143 'upfront':117 'usag':216 'usdc':9,28,100,145 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,159 'wallet':198 'wallet-connect':197 'web3':74 'x402':43,107,134,161 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e3536fff-bb71-4e03-852e-53aff516c435","listingId":"ed80aaf4-e228-45e2-8d02-01de0bf04a07","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.400Z"}],"sources":[{"listingId":"ed80aaf4-e228-45e2-8d02-01de0bf04a07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.400Z","lastSeenAt":"2026-04-22T04:02:48.049Z"}],"details":{"listingId":"ed80aaf4-e228-45e2-8d02-01de0bf04a07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/119 \\\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":"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/119 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/119"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data or crypto gas estimates with per-call USDC payments","Geocoding or data validation as a utility service in automated pipelines","Exporting analytics data or generating insights via pay-as-you-go endpoints"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, no-API-key access to common utility endpoints","Micropayment-friendly workflows where $0.02/call is cost-effective"],"notFor":["High-volume batch processing where per-call pricing adds up quickly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:44.9Z"},"updatedAt":"2026-04-22T04:02:48.049Z"}}