{"id":"b47de346-9e73-4466-9ac6-48956154d147","shortId":"XhuYu2","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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/79` is labeled \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The caller simply includes an X-PAYMENT header with a valid payment proof. The endpoint accepts HTTP POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/messages/79` path is unclear — it may be a messaging or content retrieval endpoint, but this is not confirmed by any available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","crypto api payments"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'","The purpose of /api/v1/messages/79 specifically is unclear — 'Premium API Access' is a generic label","No request body schema or response schema is documented anywhere in the crawled material","Cannot verify what data or service this specific endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/79","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/79","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). However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/79 endpoint, and no usage examples. The crawled docs pages returned only wallet-connect prompts. The actual functionality of this specific endpoint is 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'/api/v1/messages/79':113,227 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,95,131 '000':126 '20':125 '6':136 'accept':173 'access':118 'across':54 'advertis':120 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,149 'application/json':179 'avail':217,247 'base':8,27,103,127 'base network api' 'base-network' 'behind':225 'beyond':181 'broad':50 'call':4,23,139 'caller':158 'catalog':51 'categori':56 'classif':71 'classification' 'confirm':244 'connect':197 'content':203,237 'convers':88 'cost':123 'crawl':220 'crypto api payments' 'data':11,30,57,61 'data-analytics' 'decim':137 'document':180,212,248 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,172,239 'estim':82 'exact':146,223 'exampl':216 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':224 'gas':81 'generat':89 'geocod':86 'geocoding' 'header':165 'http':174 'includ':160 'infrastructur':84 'insight':63 'key':150 'label':115 'land':183 'learn':66 'limit':154 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'materi':221 'maximum':122 'may':232 'messag':235 'metric':59 'micropayment api' 'network':104 'no-api-key' 'offer':10,29 'openapi':207 'page':184 'path':228 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':140,164,169 'per':3,22,96,138 'platform':6,25,46 'post':175 'premium':116 'price':75,93 'prompt':199 'proof':170 'protocol':108 'quot':80 'rate':78,153 'report':60 'request':97,176 'request/response':210 'requir':156 'retriev':238 'return':178,194 'rout':192 'schema':211 'scheme':147 'sentiment':67 'sentiment-analysis' 'serverless api' 'settl':98 'simpli':159 'sinc':133 'spars':186 'spec':208 'specif':110 'subscript':151 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':230 'unit':128 'usag':215 'usd':132 'usdc':9,28,100,130,134 'usdc api' 'usdc-settlement' 'use':135 'util':15,34,85 'utility-services' 'valid':87,168 'via':105,143 'wallet':198 'web3':74 'x':163 'x-payment':162 'x402':43,107,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c79b9133-fbd2-4b97-8d9e-22b622f0088e","listingId":"b47de346-9e73-4466-9ac6-48956154d147","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.847Z"}],"sources":[{"listingId":"b47de346-9e73-4466-9ac6-48956154d147","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.847Z","lastSeenAt":"2026-04-22T02:32:07.865Z"}],"details":{"listingId":"b47de346-9e73-4466-9ac6-48956154d147","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/79 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/79"},{"claim":"All listed 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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/79"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Geocoding, data validation, or format conversion as utility calls within automated workflows","Exporting analytics data or generating insights reports on a per-request billing basis"],"bestFor":["AI agents and bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly compared to subscription-based alternatives","Users who need detailed API documentation, SLAs, or guaranteed uptime before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.311Z"},"updatedAt":"2026-04-22T02:32:07.865Z"}}