{"id":"ce7f6980-101f-45e1-979f-40604157d3c3","shortId":"Wwu7Tb","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, 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, 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/157` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nNote that while the landing page advertises many endpoints across multiple categories, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind `/api/v1/inbox/157` (as opposed to the named category endpoints) is unclear from the available material.","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":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/157 is labeled 'Premium API Access' but its actual functionality is undocumented — it does not appear in the landing page's listed endpoints","All secondary pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/157","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/157","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/157 is not explained. The /api, /pricing, and /README pages are all behind a wallet-connect gate with no useful 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'/api/v1/inbox/157':122,230 '/pricing':196 '/readme':198 '/request':19,38 '0.02':18,37,95,144 '000':139 '20':138 '402':133 '402 payment api' '6':149 'accept':168 'access':128 'across':54,185 'actual':227 'address':165 'advertis':182 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':174 'avail':225,242 'base':8,27,103,140,152 'base network api' 'behind':229 'broad':50 'call':4,23 'catalog':51 'categori':56,187,236 'challeng':134 'cheap api' 'classif':71 'classification' 'commit':118 'connect':206 'content':211 'convers':88 'crawl':189 'data':11,30,57,61 'data-analytics' 'decim':150 'document':190,220 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,167,184,237 'estim':82 'exact':159 'exampl':224 'exchang':77 'export':62 'expos':48 'extrem':192 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':228 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':169 'infrastructur':84 'insight':63 'key':111 'land':180 'learn':66 'limit':114 'list':124 'live':132 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':155 'mani':183 'materi':243 'metric':59 'micropayment api' 'multipl':186 'name':235 'network':104 'note':176 'offer':10,29 'openapi':215 'oppos':232 'page':181,199 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':153 'per':3,22,96 'platform':6,25,46 'post':170 'premium':126 'price':75,93 'prompt':207 'protocol':108 'quot':80 'rate':78,113 'report':60 'request':97,135,171 'request/response':218 'resolv':201 'respons':175 'return':130,173 'schema':219 'scheme':160 'sentiment':67 'sentiment-analysis' 'sinc':146 'spec':216 'specif':120 'specifi':163 'summar':70 'text':69 'text-summarization' 'thin':193 'token':79 'unclear':239 'unit':141 'upfront':117 'usag':223 'usd':145 'usdc':9,28,100,143,147 'usdc api' 'usdc-base' 'use':148 'util':15,34,85 'utility-apis' 'valid':87 'via':105,156 'wallet':164,205 'wallet-connect':204 'web3':74 'x402':43,107,158 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8c85939b-024c-4a20-9cb1-0ccd386a2b86","listingId":"ce7f6980-101f-45e1-979f-40604157d3c3","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.456Z"}],"sources":[{"listingId":"ce7f6980-101f-45e1-979f-40604157d3c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.456Z","lastSeenAt":"2026-04-22T11:32:56.003Z"}],"details":{"listingId":"ce7f6980-101f-45e1-979f-40604157d3c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/157 \\\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 402 challenge for /api/v1/inbox/157 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/157"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-cost, no-signup API access via crypto micropayments","Developers who want to avoid API key provisioning and rate limit management","Use cases requiring occasional, bursty API calls where subscription pricing is wasteful"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.997Z"},"updatedAt":"2026-04-22T11:32:56.003Z"}}