{"id":"149f50ef-4711-4e2d-bdfe-812bbbfad780","shortId":"w6vgfR","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 set of endpoints across four categories: 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). All endpoints are priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint probed (`/api/v1/inbox/199`) is described as \"Premium API Access\" and returned a valid 402 challenge with a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages 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 crawl. The actual functionality behind `/api/v1/inbox/199` is unclear; the generic \"Premium API Access\" label does not describe what data or service it provides. The broader platform lists many endpoints but without schemas or sample payloads, it is difficult to confirm what each one actually returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","USDC API","micropayment API","low fee API","Base network API","paywall API","on-demand API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/199 has no description beyond 'Premium API Access' — its actual functionality is unknown","Documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no useful content","No request or response examples are available; input format must be guessed","The 'inbox/199' path pattern suggests a user-specific or message-specific resource, but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/199","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/inbox/199","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the endpoint name 'Premium API Access' is generic and uninformative. The /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. Effectively a stub 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'/api/v1/inbox/199':122,217 '/pricing':180 '/readme':182 '/request':19,38 '0.02':18,37,94,149 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':139 '402':133 '6':145 'Base network API' 'USDC API' 'accept':165 'access':128,224 'across':54 'actual':214,255 'addit':194 'address':157 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,109,127,223 'application/json':170 'avail':209 'base':8,27,102,141 'behind':216 'beyond':172 'broad':50 'broader':236 'call':4,23 'categori':56 'chain':155 'challeng':134 'classif':70 'classification' 'commit':117 'confirm':251 'connect':190 'content':195 'convers':87 'conversion' 'crawl':212 'crypto-quotes' 'data':11,30,57,230 'data-analytics' 'decim':146 'describ':124,228 'difficult':249 'document':171,204 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,120,164,240 'equal':148 'estim':81 'exact':161 'exampl':208 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'function':215 'gas':80 'gas-estimates' 'generat':88 'generic':221 'geocod':85 'geocoding' 'infrastructur':83 'insight':62 'key':110 'label':225 'land':174 'learn':65 'limit':113 'list':238 'low fee API' 'lowpaymentfee.com':39 'machin':64 'mani':239 'maxamountrequir':137 'metric':59 'micropayment API' 'network':103 'offer':10,29 'on-chain':153 'on-demand API' 'one':254 'openapi':199 'page':175,183 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payabl':97 'payload':246 'payment':150 'paywall API' 'per':3,22,95 'platform':6,25,46,237 'post':166 'premium':126,222 'price':74,92 'probe':121 'prompt':191 'protocol':107 'provid':234 'quot':79 'rate':77,112 'report':60 'request':96,167 'request/response':202 'resolv':185 'return':130,169,256 'sampl':245 'schema':203,243 'scheme':162 'sentiment':66 'sentiment-analysis' 'servic':232 'set':51 'settl':152 'spars':177 'spec':200 'specif':119 'summar':69 'text':68 'text-summarization' 'token':78 'unclear':219 'unit':142 'upfront':116 'usag':207 'usdc':9,28,99,144 'usdc-base' 'use':159 'util':15,34,84 'valid':86,132 'validation' 'via':104 'wallet':189 'wallet-connect':188 'web3':73 'without':242 'x402':43,106 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"af291505-2e64-40bc-a67d-52ec752e0860","listingId":"149f50ef-4711-4e2d-bdfe-812bbbfad780","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/inbox/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.833Z"}],"sources":[{"listingId":"149f50ef-4711-4e2d-bdfe-812bbbfad780","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.833Z","lastSeenAt":"2026-04-22T10:02:57.140Z"}],"details":{"listingId":"149f50ef-4711-4e2d-bdfe-812bbbfad780","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/199 \\\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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/199 shows maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/199"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/199"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding or data validation as a utility service with no subscription required","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.26Z"},"updatedAt":"2026-04-22T10:02:57.140Z"}}