{"id":"8ac7674c-d8fb-482a-9323-224a69859f38","shortId":"Rp2aq5","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 catalog 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 `/api/v1/inbox/127` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that while the landing page advertises many endpoints, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind this particular inbox endpoint and the broader catalog cannot be verified from the crawl material alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","serverless API marketplace"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The specific purpose of /api/v1/inbox/127 ('Premium API Access') is not documented; it may be a generic or placeholder endpoint","Broad claims on the landing page (16+ endpoints across 4 categories) cannot be verified from crawl data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/127","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and its price ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and the documentation pages are effectively empty. The purpose of this specific 'inbox/127' endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/inbox/127':121 '/pricing':194 '/readme':196 '/request':19,38 '0.02':18,37,94,149 '000':139 '0x8335':144 '20':138 '6':153 'Base network API' 'USDC micropayment API' 'accept':170 'access':127 'across':54 'actual':224 'address':167 'advertis':183 'ai':12,31,63 'ai-inference' 'alon':242 'analysi':67 'analyt':58 'api':5,24,45,109,126 'application/json':176 'avail':222 'base':8,27,102,140,146 'behind':226 'broad':50 'broader':233 'call':4,23 'cannot':235 'catalog':51,234 'categori':56 'challeng':133 'classif':70 'classification' 'commit':117 'connect':202 'convers':87 'crawl':187,240 'crypto-paid API' 'crypto-quotes' 'data':11,30,57 'data-analytics' 'decim':154 'detail':208 'document':188,217 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,120,169,185,230 'equal':148 'estim':81 'exact':161 'exampl':221 'exchang':76 'export':61 'expos':48 'extrem':190 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'function':225 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':150 'http':171 'inbox':229 'infrastructur':83 'insight':62 'key':110 'land':181 'learn':65 'limit':113 'list':123 'low fee API' 'lowpaymentfee.com':39 'machin':64 'made':157 'mani':184 'materi':241 'maxamountrequir':136 'metric':59 'network':103 'note':177 'offer':10,29 'openapi':212 'page':182,197 'particular':228 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payabl':97 'payment':155 'payto':166 'per':3,22,95 'platform':6,25,46 'post':172 'premium':125 'price':74,92 'prompt':204 'protocol':107 'quot':79 'rate':77,112 'report':60 'request':96,173 'request/response':215 'return':129,175,199 'schema':216 'scheme':162 'sentiment':66 'sentiment-analysis' 'serverless API marketplace' 'spec':213 'specif':119 'specifi':165 'summar':69 'text':68 'text-summarization' 'thin':191 'token':78 'unit':141 'upfront':116 'usag':220 'usdc':9,28,99,143,151 'usdc-base' 'util':15,34,84 'utility-apis' 'valid':86,131 'verifi':237 'via':104,158 'wallet':203 'web3':73 'x402':43,106,132,160 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f1cadfea-4584-43a2-aa02-8c2d46b210cb","listingId":"8ac7674c-d8fb-482a-9323-224a69859f38","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.236Z"}],"sources":[{"listingId":"8ac7674c-d8fb-482a-9323-224a69859f38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.236Z","lastSeenAt":"2026-04-22T12:05:15.260Z"}],"details":{"listingId":"8ac7674c-d8fb-482a-9323-224a69859f38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/127 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/127","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"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/inbox/127 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/127"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation utilities with instant USDC micropayments","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["Agents or bots that need frictionless, key-free API access via crypto micropayments","Developers prototyping with multiple utility endpoints at low per-call cost","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.395Z"},"updatedAt":"2026-04-22T12:05:15.260Z"}}