{"id":"f3363f2c-24b3-47c0-ba52-ed7c86fae51e","shortId":"ZdxnaB","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request.","tagline":"Pay-per-call API platform on Base with USDC payments via x402 — $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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 payment protocol handles authentication: callers include an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/200` is listed as \"Premium API Access.\" Based on the x402 challenge, it accepts POST requests and charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The response MIME type is application/json. No detailed input/output schema is documented beyond the basic HTTP POST method.\n\nThe platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced identically at $0.02 per call. Documentation pages (/docs, /pricing, /api, /README) appear to require wallet connection and contain no publicly crawlable content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","low fee API","crypto API payments","402 payment required"],"warnings":["No public documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no content.","The specific purpose and expected input/output of /api/v1/transactions/200 is undocumented.","No OpenAPI schema or request/response examples are available.","The broad range of advertised endpoints (AI, finance, geo, etc.) cannot be verified for actual functionality from the crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/200","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/transactions/200","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 documented request/response schema, no examples, and all documentation pages are gated behind wallet connection. The purpose of the specific /api/v1/transactions/200 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/200':110 '/docs':217 '/pricing':218 '/readme':220 '/request':15,30 '0.02':14,29,59,143,212 '000':132 '0x8335':137 '20':131 '2913':138 '402 payment required' '6':147 'Base network API' 'USDC pay-per-call' 'accept':123 'access':116 'across':172 'addit':170 'advertis':169 'ai':182 'ai/ml':49 'analysi':186 'analyt':48,176 'api':5,20,37,71,115 'appear':221 'application/json':154 'authent':85 'base':8,23,67,117,133,140 'basic':163 'beyond':161 'broad':42 'call':4,19,214 'caller':86 'categori':174 'challeng':121 'charg':127 'classif':189 'collect':43 'commit':78 'connect':225 'contain':227 'content':231 'convers':205 'cost':58 'crawlabl':230 'crypto API payments' 'data':47,52,175,179 'decim':148 'detail':156 'document':160,215 'embed':190 'enabl':36 'endpoint':45,57,108,171 'equal':142 'estim':200 'everi':56 'exchang':195 'export':180 'feed':194 'financ':191 'finance/web3':51 'four':173 'fulfil':101 'gas':199 'generat':206 'geocod':203 'given':144 'handl':84 'header':92 'http':164 'http-post' 'ident':210 'includ':87 'infer':50 'infrastructur':202 'input/output':157 'insight':181 'json-response' 'key':72 'learn':184 'limit':75 'list':112 'low fee API' 'lowpaymentfee.com':31 'machin':183 'maximum':129 'method':166 'metric':177 'micropayment API' 'mime':151 'network':68 'no-api-key' 'offer':40 'page':216 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':11,26,82,91,97 'per':3,18,60,213 'platform':6,21,38,168 'post':124,165 'premium':114 'price':193,209 'protocol':83 'public':229 'quot':198 'rate':74,196 'report':178 'request':61,103,125 'requir':79,223 'respons':150 'schema':158 'sentiment':185 'server':100 'servic':55 'sign':95 'span':46 'specif':107 'summar':188 'text':187 'token':197 'type':152 'unit':134 'upon':104 'usdc':10,25,64,96,136,145 'usdc-base-network' 'util':54 'valid':204 'verif':105 'via':12,27 'wallet':224 'web3':192 'x':90 'x-payment':89 'x402':13,28,35,81,120 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c9f13c51-6dc1-401a-aed7-8919682bbd88","listingId":"f3363f2c-24b3-47c0-ba52-ed7c86fae51e","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/transactions/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:05.417Z"}],"sources":[{"listingId":"f3363f2c-24b3-47c0-ba52-ed7c86fae51e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:05.417Z","lastSeenAt":"2026-04-22T21:31:37.435Z"}],"details":{"listingId":"f3363f2c-24b3-47c0-ba52-ed7c86fae51e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/200 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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/transactions/200 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/200"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Web3 applications that want to consume utility APIs settled on Base"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with USDC wallets on Base looking for cheap per-call endpoints","Prototyping and low-volume usage where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-call crypto payments add latency","Users without a Base-compatible USDC wallet","Anyone needing detailed API documentation — docs pages are currently behind a wallet-connect gate"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.254Z"},"updatedAt":"2026-04-22T21:31:37.435Z"}}