{"id":"9390b442-4e15-4b46-a91a-6ef4d02c0964","shortId":"h9er9d","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/1` 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 payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. No OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling — the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","analytics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","analytics","finance","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","micropayment API","USDC API","Base network API","AI inference API","data analytics API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content","The specific purpose and expected input/output of /api/v1/messages/1 ('Premium API Access') is undocumented — request/response examples are inferred","The broader API catalog (AI, analytics, finance, utils) is advertised but none of those endpoints were individually probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/1","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/1","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 x402 challenge, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the docs/pricing/README pages are gated behind a wallet connection. The actual behavior of /api/v1/messages/1 is unclear — its name and purpose are not 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'/request':18,36 '0.02':17,35,68,129,206 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':123 '300':151 '6':134 'AI inference API' 'Base network API' 'USDC API' 'accept':156 'access':114 'address':143 'advertis':165 'ai':11,29,177 'ai/ml':55 'analysi':181 'analyt':12,30,54,171 'analytics' 'api':5,23,43,85,113,169 'application/json':161 'attach':96 'base':8,26,76,125,137 'broad':48 'broader':163 'call':4,22 'caller':94 'categori':167 'challeng':119 'classif':184 'collect':49 'commit':93 'connect':231 'content':237 'convers':200 'conversion' 'cover':10,28 'crawl':220 'data':53,58,170,174 'data analytics API' 'data-export' 'decim':135 'detail':211 'doc':222 'document':212 'embed':185 'embeddings' 'enabl':42 'endpoint':51,64,106,155 'estim':195 'everi':63 'exact':147 'exampl':214 'exchang':190 'exchange-rates' 'export':175 'feed':189 'financ':13,31,186 'finance/web3':57 'found':218 'four':166 'gas':194 'gas-estimates' 'general':60 'generat':201 'geocod':198 'geocoding' 'header':100 'infer':56 'infrastructur':61,197 'insight':176 'key':86 'learn':179 'limit':89 'list':110 'low payment fee API' 'lowpaymentfee.com':37 'machin':178 'metric':172 'micropayment API' 'network':77 'offer':46 'openapi':209 'page':226 'paid':71 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':216 'payment':99,139 'per':3,21,69 'platform':44,164 'post':157 'premium':112 'price':66,188,207,223 'price-feeds' 'prompt':233 'protocol':81 'quot':193 'rate':88,191 'readm':225 'report':173 'request':70,103,120,158 'request/response':215 'return':116,160,228 'schema':210 'scheme':148 'second':152 'sentiment':180 'sentiment-analysis' 'settl':141 'share':203 'simpli':95 'sinc':131 'span':52 'specif':105 'suit':6,24 'summar':183 'text':182 'text-classification' 'text-summarization' 'timeout':153 'token':192 'unit':126 'upfront':92 'usd':130 'usdc':9,27,73,128,132 'usdc-base' 'use':133,145 'util':15,33,62 'valid':199 'validation' 'via':78 'wallet':232 'web3':187 'x402':41,80,98,118 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d2ffce5b-b5e5-4941-91a6-439a33b4c2c7","listingId":"9390b442-4e15-4b46-a91a-6ef4d02c0964","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.655Z"}],"sources":[{"listingId":"9390b442-4e15-4b46-a91a-6ef4d02c0964","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.655Z","lastSeenAt":"2026-04-22T12:05:24.083Z"}],"details":{"listingId":"9390b442-4e15-4b46-a91a-6ef4d02c0964","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":{"message":"Hello"},"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/messages/1 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/1"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes, gas estimates, or exchange rates on a per-call basis","Exporting data or generating analytics reports with instant pay-per-use billing","Geocoding addresses or validating data through utility endpoints"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers wanting low-friction access to AI inference endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.251Z"},"updatedAt":"2026-04-22T12:05:24.083Z"}}