{"id":"7c087d51-e1fa-413e-aa16-2bd76ae3a7a6","shortId":"nwWtC9","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that exposes a variety 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 with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/inbox/138` is listed as \"Premium API Access\" and returns a valid x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site-wide pricing. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP 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 purpose of the `/api/v1/inbox/138` path specifically (as opposed to the named endpoints like `/api/v2/ai/sentiment`) is unclear; it may be a generic or catch-all premium endpoint. Without further documentation, the exact input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no-auth api","pay-as-you-go api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages return only a wallet-connect prompt with no content","The specific path /api/v1/inbox/138 ('Premium API Access') does not correspond to any of the named endpoints on the landing page — its exact function is unknown","No request body schema or response examples are documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/138","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/138","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 with clear pricing, but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/inbox/138 is undocumented. The landing page lists many endpoints but provides no detail on inputs or 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'/api/v1/inbox/138':114,226 '/api/v2/ai/sentiment':236 '/pricing':189 '/readme':191 '/request':17,34 '0.02':16,33,89,148 '000':132 '0x8335':137 '20':131 '2913':138 '300':168 '6':144 'accept':173 'access':120 'across':49 'addit':203 'ai':10,27,58 'ai-inference' 'analysi':62 'analyt':53 'api':4,21,41,101,119 'application/json':179 'avail':218 'base':7,24,97,133,140 'base network api' 'beyond':181 'call':150 'cannot':260 'catch':246 'catch-al':245 'categori':51 'challeng':126 'cheap api' 'classif':65 'commit':109 'connect':199 'consist':151 'content':204 'convers':82 'conversion' 'crawl':221 'crypto-quotes' 'data':9,26,52 'data-analytics' 'decim':145 'determin':262 'document':180,213,252 'embed':66 'embeddings' 'endpoint':14,31,48,85,112,172,234,249 'equal':147 'estim':76 'exact':164,254 'exampl':217 'exchang':71 'export':56 'expos':44 'feed':70 'financ':11,28,67 'finance-data' 'format':259 'four':50 'gas':75 'gas-estimates' 'gate':3,20 'generat':83 'generic':243 'geocod':80 'geocoding' 'http':174 'infrastructur':78 'input':255 'insight':57 'key':102 'land':183 'learn':60 'like':235 'limit':105 'list':116 'low payment fee' 'lowpaymentfee.com':35 'machin':59 'made':160 'marketplac':42 'maxamountrequir':129 'may':240 'metric':54 'micropayment api' 'minimum':108 'name':233 'network':98 'no-auth api' 'offer':8,25 'openapi':208 'oppos':230 'page':184,192 'paramet':256 'path':227 'pay per call api' 'pay-as-you-go api' 'pay-per-request' 'payabl':92 'payment':158 'per':90,149 'platform':5,22 'post':175 'premium':118,248 'price':69,87,157 'prompt':200 'protocol':40 'purpos':223 'quot':74 'rate':72,104 'report':55 'request':91,176 'request/response':211 'resolv':194 'respons':258 'return':122,178 'schema':212 'scheme':165 'second':169 'sentiment':61 'sentiment-analysis' 'sinc':141 'site':155 'site-wid':154 'spars':186 'spec':209 'specif':111,228 'summar':64 'text':63 'text-classification' 'text-summarization' 'timeout':170 'token':73 'unclear':238 'unit':134 'usag':216 'usdc':94,136,142 'usdc api' 'usdc-base' 'use':143 'util':13,30,79 'valid':81,124 'validation' 'varieti':46 'via':161 'wallet':198 'wallet-connect':197 'web3':68 'wide':156 'without':250 'x402':2,19,39,125,163 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e6c928c7-29e0-4dd6-b9e0-a0159ee73739","listingId":"7c087d51-e1fa-413e-aa16-2bd76ae3a7a6","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.343Z"}],"sources":[{"listingId":"7c087d51-e1fa-413e-aa16-2bd76ae3a7a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.343Z","lastSeenAt":"2026-04-22T02:31:59.196Z"}],"details":{"listingId":"7c087d51-e1fa-413e-aa16-2bd76ae3a7a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/138 \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/138"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto price feeds and gas estimates with per-request micropayments","Running geocoding or data validation utilities on a pay-per-use basis","Exporting analytics data or generating reports without subscription commitments","Agent-driven workflows that need low-friction, wallet-authenticated API access"],"bestFor":["AI agents and bots that can settle x402 payments autonomously on Base","Developers who want pay-per-request access without API key signup","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or dedicated support","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed API documentation or OpenAPI specs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.27Z"},"updatedAt":"2026-04-22T02:31:59.196Z"}}