{"id":"6728f85a-58fb-4c5d-a83a-565cadbdcfd7","shortId":"nq2jFB","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 provides a broad catalog of pay-per-request 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.\n\nThe specific endpoint `/api/v1/messages/57` is listed as \"Premium API Access\" and its 402 challenge advertises 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 with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that the crawled documentation is extremely thin: the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The purpose of the `/api/v1/messages/57` endpoint specifically is unclear from the available material — the site's landing page does not list it among its advertised endpoints, and \"Premium API Access\" is a generic label. Callers should expect JSON responses but cannot know the exact input or output schema without experimentation.","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":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee","crypto API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/messages/57 endpoint is not listed among the site's advertised APIs — its purpose is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","No request or response examples are available; input/output formats must be discovered experimentally"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/57","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/messages/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/messages/57 endpoint is not described anywhere on the site. Effectively a stub 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'/api/v1/messages/57':116,231 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,99,142 '000':132 '0x8335':137 '20':131 '402':125 '6':146 'Base network API' 'USDC API' 'accept':182 'access':122,256 'across':58 'advertis':127,251 'ai':12,31,68 'ai-inference' 'among':249 'analysi':72 'analyt':62 'api':5,24,45,121,158,255 'application/json':188 'attach':169 'avail':226,238 'base':8,27,107,133,139 'broad':50 'call':4,23 'caller':167,261 'cannot':267 'catalog':51 'categori':60 'challeng':126 'classif':75 'classification' 'connect':207 'content':213 'convers':92 'crawl':192 'crypto API access' 'data':11,30,61,65 'data-analytics' 'decim':147 'document':193,222 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,181,232,252 'equal':141 'estim':86 'exact':154,270 'exampl':225 'exchang':81 'expect':263 'experiment':276 'export':66 'extrem':195 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'gas':85 'generat':93 'generic':259 'geocod':90 'geocoding' 'given':143 'header':174 'http':183 'infrastructur':88 'input':271 'insight':67 'json':264 'key':159 'know':268 'label':260 'land':243 'learn':70 'limit':162 'list':118,247 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':150 'materi':239 'maxamountrequir':129 'metric':63 'micropayment API' 'network':108 'note':189 'offer':10,29 'openapi':217 'output':273 'page':202,244 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':148,173,178 'per':3,22,55,100 'platform':6,25,46 'post':184 'premium':120,254 'price':79,97 'prompt':209 'proof':179 'protocol':112 'provid':48 'purpos':228 'quot':84 'rate':82,161 'report':64 'request':56,101,185 'request/response':220 'requir':166 'respons':265 'return':187,204 'schema':221,274 'scheme':155 'sentiment':71 'sentiment-analysis' 'simpli':168 'site':241 'spec':218 'specif':114,233 'subscript':165 'summar':74 'text':73 'text-summarization' 'thin':196 'token':83 'unclear':235 'unit':134 'usdc':9,28,104,136,144 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91,177 'via':109,151 'wallet':208 'web3':78 'without':275 'x':172 'x-payment':171 'x402':43,111,153 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7dad5542-1800-49f8-81b6-eee557f107ad","listingId":"6728f85a-58fb-4c5d-a83a-565cadbdcfd7","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/messages/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.957Z"}],"sources":[{"listingId":"6728f85a-58fb-4c5d-a83a-565cadbdcfd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.957Z","lastSeenAt":"2026-04-22T02:32:08.014Z"}],"details":{"listingId":"6728f85a-58fb-4c5d-a83a-565cadbdcfd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/57"},{"claim":"Site offers endpoints 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 or subscriptions","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request USDC micropayments","Using utility services like geocoding, validation, and conversion without account setup"],"bestFor":["Agents and developers who want instant, keyless API access paid per request in USDC","Prototyping and low-volume usage where subscription plans are unnecessary","Web3-native applications that can settle payments on Base L2"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.178Z"},"updatedAt":"2026-04-22T02:32:08.014Z"}}