{"id":"b8914862-b254-4be1-b67a-7b909c5729e8","shortId":"tXwHK3","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 provides a broad catalog of pay-per-request 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, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/177` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform advertises no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/messages/177` path is unclear — it does not map to any of the named endpoints on the homepage. Callers should expect to experiment or contact the provider for specifics.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","sentiment-analysis","text-summarization","classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available","The /api/v1/messages/177 path does not correspond to any named endpoint on the homepage — its exact functionality is unknown","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No request or response examples are available; callers must experiment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/177","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/177","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 402 challenge, but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific /messages/177 path is not documented on the homepage. The crawled /api, /pricing, and /README pages are empty. Effectively a stub 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'/api/v1/messages/177':117,226 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,99,139 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':177 '20':132 '402':127 '402 payment api' 'access':123,155 'across':58 'address':171 'advertis':144 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,122,146 'attach':158 'avail':217 'base':8,27,107,134,141,179 'base network api' 'behind':224 'beyond':181 'broad':50 'call':4,23 'caller':156,243 'catalog':51 'categori':60 'challeng':128 'classif':75 'classification' 'connect':197 'contact':249 'contract':176 'convers':92 'conversion' 'crawl':220 'data':11,30,61,65 'data-analytics' 'detail':203 'document':180,212 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,239 'estim':86 'exact':222 'exampl':216 'exchang':81 'exchange-rates' 'expect':245 'experi':247 'export':66 'feed':80 'financ':13,32,77 'four':59 'function':223 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'header':162 'homepag':242 'i.e':138 'infrastructur':88 'insight':67 'instant':154 'key':147 'land':183 'learn':70 'limit':150 'list':119 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'map':233 'metric':63 'micropayment api' 'minimum':152 'name':238 'network':108 'offer':10,29 'openapi':207 'page':184 'path':227 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':161,167 'per':3,22,55,100 'platform':6,25,46,143 'premium':121 'price':79,97 'price-feeds' 'prompt':199 'protocol':112 'provid':48,251 'quot':84 'rate':82,149 'report':64 'request':56,101,129,165 'request/response':210 'return':125,194 'rout':192 'schema':211 'sentiment':71 'sentiment-analysis' 'settl':169 'simpli':157 'spars':186 'spec':208 'specif':114,253 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':229 'unit':135 'usag':215 'usdc':9,28,104,137,175 'usdc api' 'usdc-base' 'use':173 'util':15,34,89 'valid':91 'validation' 'via':109 'wallet':198 'web3':78 'x402':43,111,160 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c15b9dcb-4aca-4f2b-a36d-4f60d35f911a","listingId":"b8914862-b254-4be1-b67a-7b909c5729e8","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/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.766Z"}],"sources":[{"listingId":"b8914862-b254-4be1-b67a-7b909c5729e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.766Z","lastSeenAt":"2026-04-22T02:32:07.726Z"}],"details":{"listingId":"b8914862-b254-4be1-b67a-7b909c5729e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/177 \\\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":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Advertises no API keys, no rate limits, no minimums, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/177"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/177"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, or gas estimates with per-call billing","Geocoding, data validation, or format conversion as lightweight utility calls from automated workflows"],"bestFor":["AI agents needing keyless, pay-per-use API access on Base","Developers wanting low-friction micropayment APIs without subscriptions","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume batch workloads where $0.02/request adds up quickly","Users who need detailed API documentation or SLA guarantees before integrating","Callers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.534Z"},"updatedAt":"2026-04-22T02:32:07.726Z"}}