{"id":"2ec84589-eaa6-4070-8246-63f1b722591a","shortId":"GRhKmY","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/374` is labeled \"Premium API Access\" and accepts payment via the x402 exact scheme. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request.\n\nThe provider's landing page lists 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 utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render 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 crawl. The specific functionality behind the `/api/v1/charges/374` path is unclear; it may be a generic charge endpoint or a specific resource. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/charges/374 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","No request body schema or response format is documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/374","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/charges/374","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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/charges/374 is ambiguous. The platform lists many endpoint categories but provides no detail on any of 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'/api/v1/charges/374':63,208 '/docs':169 '/pricing':171 '/readme':173 '/request':17,34 '0.02':16,33,98,149 '000':85 '0x8335':90 '20':84 '2913':91 '402':231 '6':94 'Base network API' 'USDC API' 'accept':70 'access':68 'advertis':79,147 'ai':10,27,118 'ai-inference' 'amount':82 'analysi':122 'analyt':112 'api':4,21,41,67,110,154 'avail':199 'base':7,24,57,86,93 'base-network' 'behind':49,206 'categori':108 'challeng':78,232 'charg':217 'classif':125 'classification' 'collect':46 'commit':162 'confirm':226 'connect':179 'content':185 'convers':142 'crawl':202 'crypto-paid API' 'data':9,26,111,115 'data-analytics' 'decim':95 'document':164,194 'embed':126 'embeddings' 'endpoint':14,31,48,61,145,218,224 'equal':97 'estim':136 'exact':75 'exampl':198 'exchang':131 'export':116 'extrem':166 'feed':130 'financ':11,28,127 'finance-data' 'four':107 'function':205 'gas':135 'gate':3,20,44 'generat':143 'generic':216 'geocod':140 'geocoding' 'infrastructur':138 'insight':117 'key':155 'label':65 'land':104 'learn':120 'limit':158 'list':106 'live':227 'low fee API' 'lowpaymentfee.com':35 'machin':119 'max':81 'may':213 'metric':113 'micropay':54 'micropayment API' 'minimum':161 'network':58 'no-api-key' 'offer':8,25 'openapi':189 'page':105,174 'path':209 'pay-per-call API' 'payment':71 'per':51,99,150 'per-request':50 'per-request-billing' 'platform':5,22,42 'premium':66 'price':129 'prompt':181 'protocol':40 'provid':102 'quot':134 'rate':132,157 'render':176 'report':114 'request':52,100,151 'request/response':192 'requir':163 'resourc':222 'respons':233 'schema':193 'scheme':76 'sentiment':121 'sentiment-analysis' 'spars':167 'spec':190 'specif':60,204,221 'summar':124 'text':123 'text-summarization' 'token':133 'unclear':211 'unit':87 'usag':197 'usdc':53,89 'usdc-micropayment' 'util':13,30,139 'utility-apis' 'valid':141,230 'via':72,228 'wallet':180 'web3':128 'x402':2,19,39,74 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"a3e6bd67-9566-46c2-9162-0ba89774019a","listingId":"2ec84589-eaa6-4070-8246-63f1b722591a","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/charges/374","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:18.107Z"}],"sources":[{"listingId":"2ec84589-eaa6-4070-8246-63f1b722591a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/374","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:18.107Z","lastSeenAt":"2026-04-23T08:01:18.693Z"}],"details":{"listingId":"2ec84589-eaa6-4070-8246-63f1b722591a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/374 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/374"},{"claim":"All listed 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 APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayments","Accessing utility services like geocoding, validation, and data conversion with per-request USDC payments","Building autonomous workflows that pay for data and analytics on a per-call basis"],"bestFor":["AI agents needing keyless, pay-per-use API access on Base","Developers prototyping with low-cost micropayment-gated endpoints","Web3-native applications that prefer on-chain settlement over subscriptions"],"notFor":["High-volume production workloads requiring guaranteed SLAs and detailed documentation","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.928Z"},"updatedAt":"2026-04-23T08:01:18.693Z"}}