{"id":"0a5d189f-4795-4a70-bfc5-df3a036017a8","shortId":"9j6SEN","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite 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 collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and 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 minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/175` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it may be a messaging or content-retrieval endpoint, but the crawled material does not clarify this. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","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 api"],"warnings":["The exact functionality of /api/v1/messages/175 is unknown — 'Premium API Access' is the only description provided.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The broader platform lists many endpoints but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/175","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network, but the specific endpoint's purpose ('Premium API Access' at /api/v1/messages/175) is undocumented. No OpenAPI schema, no request/response examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. This is effectively a stub 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'/request':19,38 '0.02':18,37,70,173,211 '000':167 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':179 '20':166 '402 payment api' 'accept':159 'access':116 'address':178 'advertis':185 'ai':12,31,57 'analysi':189 'analyt':56 'api':5,24,45,87,115 'attach':98 'base':8,27,78,168,181 'base network api' 'beyond':130 'broad':50 'broader':183 'call':4,23,175 'caller':96 'challeng':154 'clarifi':150 'classif':192 'collect':51 'commit':95 'confirm':155 'content':141 'content-retriev':140 'convers':204 'cover':10,29 'crawl':146,227 'data':11,30,55 'detail':217 'document':129,219 'embed':193 'enabl':44 'endpoint':16,35,53,66,108,143,186 'estim':201 'everi':65 'exact':125 'exampl':222 'exchang':196 'feed':195 'financ':13,32,60 'follow':118 'found':224 'function':126 'gas':200 'generat':206 'generic':132 'geocod':202 'header':102 'i.e':172 'infrastructur':63 'key':88 'learn':59 'limit':91 'list':112 'live':158 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'materi':147 'may':135 'messag':138 'micropayment api' 'minimum':94 'network':79 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':215 'paid':73 'pattern':123 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':101,122 'per':3,22,71,174 'platform':46,184 'point':213 'post':160 'post-endpoint' 'premium':114 'price':68,194,212 'protocol':83 'quot':199 'rate':90,197 'request':72,105,161 'request/response':218 'requir':163 'retriev':142 'schema':216 'sentiment':188 'settl':176 'simpli':97 'span':54 'specif':107 'suit':6,25 'summar':191 'text':190 'titl':133 'token':198 'unit':169 'usag':221 'usdc':9,28,75,171 'usdc api' 'usdc-base' 'util':15,34,64 'valid':203 'via':80 'web3':61 'x402':43,82,100,121,153 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7e1857e1-65c7-4e61-9071-10f1ee478a83","listingId":"0a5d189f-4795-4a70-bfc5-df3a036017a8","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.263Z"}],"sources":[{"listingId":"0a5d189f-4795-4a70-bfc5-df3a036017a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/175","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.263Z","lastSeenAt":"2026-04-22T02:32:06.563Z"}],"details":{"listingId":"0a5d189f-4795-4a70-bfc5-df3a036017a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/175 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/175"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/175"},{"claim":"All 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Prototyping integrations without signing up for API keys or subscriptions"],"bestFor":["Developers wanting zero-commitment, per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.313Z"},"updatedAt":"2026-04-22T02:32:06.563Z"}}