{"id":"ced6670c-845f-436d-9479-732021a953fc","shortId":"S75njw","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/102` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is minimal: the landing page lists available endpoints with short descriptions and prices, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a valid 402 challenge), but without detailed schemas or example payloads it is difficult to know exactly what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-marketplace","llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","The specific purpose of /api/v1/messages/102 is undocumented — unclear what it does beyond 'Premium API Access'","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No examples of request bodies or response formats are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/102","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI spec, no request/response schemas, no usage examples, and the docs pages are empty. The specific purpose of /api/v1/messages/102 is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/messages/102':111 '/pricing':200 '/readme':202 '/request':19,38 '0.02':18,37,70,132,167 '000':127 '20':126 '402':223 '402 payment api' '6':137 'access':117 'addit':144,213 'advertis':143 'ai':12,31,57 'ai-inference' 'analysi':148 'analyt':56 'api':5,24,45,88,116 'attach':99 'avail':177 'base':8,27,78,128,140 'base network api' 'bodi':240 'broad':50 'call':4,23 'caller':97 'challeng':122,224 'classif':151 'collect':51 'commit':96 'confirm':218 'connect':208 'content':214 'convers':159 'conversion' 'cover':10,29 'crypto-quotes' 'data':11,30,55,161 'data-analytics' 'decim':138 'descript':181 'detail':227 'difficult':234 'document':170,193 'embed':152 'embeddings' 'enabl':44 'endpoint':16,35,53,66,109,145,178,216 'everi':65 'exact':237 'exampl':197,230 'exchang':155 'expect':247 'export':162 'feed':154 'financ':13,32,60 'finance-data' 'geocod':157 'geocoding' 'header':103 'includ':146 'infrastructur':63 'key':89 'know':236 'land':174 'learn':59 'limit':92 'list':113,176 'live':219 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'micropayment api' 'minim':172 'minimum':95 'network':79 'offer':48 'openapi':188 'page':175,203 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':231 'payment':83,102 'per':3,22,71 'platform':46,142 'point':169 'premium':115 'price':68,153,168,183 'prompt':210 'protocol':84 'rate':91,156 'request':72,106,123,239 'request/response':191 'resolv':205 'respons':245 'return':119,220 'schema':192,228 'send':242 'sentiment':147 'sentiment-analysis' 'settl':73 'short':180 'simpli':98 'sinc':134 'span':54 'spec':189 'specif':108 'suit':6,25 'summar':150 'text':149 'text-classification' 'text-summarization' 'unit':129 'usag':196 'usd':133 'usdc':9,28,75,131,135 'usdc api' 'usdc-base' 'use':136 'util':15,34,64 'valid':158,222 'validation' 'via':80 'wallet':209 'web3':61 'without':226 'x402':43,82,101,121 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9b6378d0-3e84-4db6-ab35-5e1920a33560","listingId":"ced6670c-845f-436d-9479-732021a953fc","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.906Z"}],"sources":[{"listingId":"ced6670c-845f-436d-9479-732021a953fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.906Z","lastSeenAt":"2026-04-22T02:32:06.032Z"}],"details":{"listingId":"ced6670c-845f-436d-9479-732021a953fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/102 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/102"},{"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 endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/102"}],"useCases":["Running AI inference tasks (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates on a per-call basis","Geocoding addresses or validating data with zero upfront commitment","Exporting data or generating analytics reports paid per request","Agent-driven workflows that need low-friction, wallet-authenticated API access"],"bestFor":["Developers or agents wanting no-signup, pay-as-you-go API access","Crypto-native applications that can settle in USDC on Base","Low-volume or bursty workloads where per-request pricing is economical"],"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 guaranteed schema stability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.872Z"},"updatedAt":"2026-04-22T02:32:06.032Z"}}