{"id":"398395d7-87b9-4af4-8eaf-3814e273a4f4","shortId":"8TNjDF","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform 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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/69` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to pay and receive a response.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. Payments are routed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe specific purpose of the `/api/v1/messages/69` endpoint is not documented beyond its \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. Treat this listing as a live but under-documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The purpose of /api/v1/messages/69 ('Premium API Access') is not explained anywhere in the crawled content","Documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no further information","No example request or response bodies are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/69","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/69","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), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The /api, /pricing, and /README pages returned no useful content. The specific function of /api/v1/messages/69 is 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'/api/v1/messages/69':69,191 '/pricing':217 '/readme':219 '/request':19,38,171 '0.02':18,37,94,170 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':178 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':185 '20':87 '402 payment required' '6':98 'accept':76 'access':74,200 'address':177 'advertis':109,127 'ai':12,31,138 'analysi':142 'analyt':132 'api':5,24,45,73,103,199 'attach':112 'base':8,27,63,89,184 'base network api' 'beyond':196 'broad':50 'call':4,23,101 'caller':110 'catalog':51 'categori':130 'challeng':83 'classif':145 'connect':225 'content':231 'contract':182 'convers':162 'cover':10,29 'crawl':214 'data':11,30,131,135 'decim':99 'detail':208 'document':195,209,241 'embed':146 'enabl':44 'endpoint':16,35,57,67,129,166,192,242 'estim':156 'exampl':206 'exchang':151 'export':136 'feed':150 'financ':13,32,147 'found':211 'four':128 'gas':155 'generat':163 'geocod':160 'given':95 'header':117 'i.e':93 'infrastructur':158 'insight':137 'key':104 'label':71,201 'learn':140 'limit':107 'list':165,234 'live':237 'low payment fee' 'lowpaymentfee.com':39 'machin':139 'metric':133 'micropayment api' 'network':64 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':203 'page':220 'pay':2,21,54,119 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':82,116,173 'per':3,22,55,100 'platform':6,25,46,126 'post':77 'post-method' 'premium':72,198 'price':149,172 'prompt':227 'purpos':188 'quot':154 'rate':106,152 'receiv':121 'report':134 'request':56,78 'request/response':205 'requir':84 'respons':123 'return':222 'rout':175 'schema':204 'sentiment':141 'settl':58 'share':167 'simpli':111 'specif':66,187 'summar':144 'text':143 'token':153 'treat':232 'under-docu':239 'unit':90 'usdc':9,28,60,92,96,181 'usdc api' 'usdc-base' 'use':179 'util':15,34,159 'valid':161 'wallet':226 'web3':148 'wider':125 'x':115 'x-payment':114 'x402':43,81 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e8447143-8eee-44dc-b47e-b33af5afb1c9","listingId":"398395d7-87b9-4af4-8eaf-3814e273a4f4","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.232Z"}],"sources":[{"listingId":"398395d7-87b9-4af4-8eaf-3814e273a4f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.232Z","lastSeenAt":"2026-04-22T02:32:08.314Z"}],"details":{"listingId":"398395d7-87b9-4af4-8eaf-3814e273a4f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/69 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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","source_url":"https://lowpaymentfee.com/api/v1/messages/69"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/69"},{"claim":"All listed endpoints are priced at $0.02/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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to data, AI, finance, or utility services with per-call USDC micropayments","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents needing keyless, pay-as-you-go API access on Base","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, schemas, or example responses before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.817Z"},"updatedAt":"2026-04-22T02:32:08.314Z"}}