{"id":"e889e21b-5af4-499c-9e31-cf51dc5a472a","shortId":"9ZvWqH","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 gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/165` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02/request price point. The platform accepts USDC (contract 0x8335…2913) on Base and pays out to a single wallet address.\n\nNote that the specific functionality behind `/api/v1/inbox/165` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" page with no additional detail. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific functionality of /api/v1/inbox/165 ('Premium API Access') is undocumented — it is unclear what data or service it provides","Docs pages (/pricing, /README, /api) returned no useful content beyond 'Connect wallet'","No request body schema or response schema is available; callers cannot know what to send or expect back","The platform lists many endpoint categories but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/165","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/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The crawled pages beyond the homepage are empty ('Connect wallet'). The actual functionality of /api/v1/inbox/165 is entirely 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'/request':17,34,159 '0.02':16,33,76,91,158 '000':82 '0x8335':167 '20':81 '2913':168 '402':232 '6':89 'Base network API' 'USDC API' 'accept':164 'access':71,194 'actual':237 'addit':222 'address':178 'advertis':113 'ai':10,27,125 'ai-inference' 'analysi':129 'analyt':119 'api':4,21,41,70,93,117,193,211 'attach':102 'base':7,24,59,83,170 'behind':49,184 'beyond':189 'broader':111 'call':78 'caller':100 'categori':115 'challeng':233 'classif':132 'classification' 'confirm':227 'connect':217 'contract':166 'convers':149 'cost':73 'crawl':206 'data':9,26,118,122 'data-analytics' 'decim':90 'detail':223 'doc':207 'document':188 'embed':133 'embeddings' 'endpoint':14,31,48,63,152,225 'estim':143 'exampl':203 'exchang':138 'export':123 'feed':137 'financ':11,28,134 'finance-data' 'four':114 'function':183 'gas':142 'gate':3,20,44 'generat':150 'generic':191 'geocod':147 'geocoding' 'header':106 'infrastructur':145 'insight':124 'key':94 'label':195 'learn':127 'limit':97 'list':67,154 'live':228 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'marketplac':42 'maxamountrequir':79 'metric':120 'micropay':53 'micropayment API' 'minim':216 'network':60 'note':179 'offer':8,25 'openapi':199 'page':208,219 'pay':172 'pay-per-call API' 'payment':105,241 'per':51,77 'per-request':50 'per-request-micropayment' 'platform':5,22,112,163 'point':161 'premium':69,192 'price':136,160,209 'protocol':40 'quot':141 'rate':96,139 'readm':210 'report':121 'request':52,109 'request/response':202 'requir':99 'resolv':213 'return':229,238 'schema':200 'sentiment':128 'sentiment-analysis' 'settl':54 'simpli':101 'singl':176 'specif':62,182 'success':240 'summar':131 'text':130 'text-summarization' 'token':140 'unit':84 'unknown':243 'upon':239 'usdc':56,86,165 'usdc-base' 'util':13,30,146 'utility-apis' 'valid':148,231 'varieti':46 'wallet':177,218 'web3':135 'x402':2,19,39,104 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"3556b189-3bb8-4f53-bdcc-0051b00acd39","listingId":"e889e21b-5af4-499c-9e31-cf51dc5a472a","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/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.824Z"}],"sources":[{"listingId":"e889e21b-5af4-499c-9e31-cf51dc5a472a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/165","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.824Z","lastSeenAt":"2026-04-22T04:02:46.248Z"}],"details":{"listingId":"e889e21b-5af4-499c-9e31-cf51dc5a472a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/165 \\\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":"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/inbox/165"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/165"},{"claim":"All 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"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports on a pay-per-use basis","Geocoding and data validation via utility endpoints"],"bestFor":["Agents or developers who want key-free, pay-per-request API access","x402-compatible clients that can settle micropayments in USDC on Base","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.827Z"},"updatedAt":"2026-04-22T04:02:46.248Z"}}