{"id":"610e3462-bce4-4414-89c1-2eea29076163","shortId":"QFDhXG","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader suite of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/messages/185` is labeled \"Premium API Access\" and accepts POST requests. Payment is 0.02 USDC per call (maxAmountRequired of 20,000 base units with 6 decimals), with no API keys, no rate limits, and instant access advertised by the provider.\n\nThe provider's landing page lists four categories of endpoints: 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 at $0.02 per request. However, the specific `/api/v1/messages/185` endpoint does not clearly map to any of these listed categories, and no documentation, request schema, or response schema is available for it. The endpoint is live and returns a valid x402 402 challenge, confirming it is operational.\n\nWithout OpenAPI specs, example requests/responses, or detailed documentation beyond the landing page listing, the exact functionality of this particular endpoint remains unclear. The provider site's /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/messages/185 does not correspond to any of the listed API categories on the provider's homepage","Provider's /api, /pricing, and /README pages returned no useful content beyond a wallet connect prompt","Exact functionality and expected request/response format are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/185","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/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific endpoint path (/api/v1/messages/185) does not match any of the documented API categories on the landing page. Functionality is essentially 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'/api/v1/messages/185':61,152 '/pricing':218 '/readme':220 '/request':13,28 '0.02':12,27,73,146 '000':80 '20':79 '402':185 '6':84 'accept':68 'access':7,22,66,95 'addit':231 'advertis':96 'ai':117 'analysi':121 'analyt':111 'api':6,21,46,65,88 'avail':173 'base':9,24,54,81 'base network api' 'base-network' 'beyond':199 'broader':39 'call':4,19,76 'categori':107,163 'challeng':186 'classif':124 'clear':156 'confirm':187 'connect':226 'content':232 'convers':140 'data':110,114 'decim':85 'detail':197 'document':166,198 'embed':125 'endpoint':32,60,109,153,177,210 'estim':135 'exact':205 'exampl':194 'exchang':130 'export':115 'feed':129 'financ':126 'four':106 'function':206 'gas':134 'generat':141 'geocod':138 'howev':149 'infrastructur':137 'insight':116 'instant':94 'key':89 'label':63 'land':103,201 'learn':119 'limit':92 'list':105,162,203 'live':179 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':118 'map':157 'maxamountrequir':77 'metric':112 'micropayment api' 'network':55 'no-api-key' 'openapi':192 'oper':190 'page':104,202,221 'part':36 'particular':209 'pay':2,17,43 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':42 'payment':71 'per':3,18,44,75,147 'post':69 'post-endpoint' 'premium':5,20,64 'premium api access' 'price':128,144 'prompt':228 'protocol':51 'provid':99,101,214 'quot':133 'rate':91,131 'remain':211 'report':113 'request':45,70,148,167 'requests/responses':195 'respons':170 'return':181,223 'schema':168,171 'sentiment':120 'settl':47 'site':215 'spec':193 'specif':59,151 'suit':40 'summar':123 'text':122 'token':132 'unclear':212 'unit':82 'usdc':15,30,57,74 'usdc api' 'usdc-settlement' 'use':56 'valid':139,183 'via':10,25,48 'wallet':227 'web3':127 'without':191 'x402':11,26,50,184 'x402 api' 'x402-payment'","prices":[{"id":"a5beb13a-1b21-4035-8d82-dbf62e2e6d03","listingId":"610e3462-bce4-4414-89c1-2eea29076163","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/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.527Z"}],"sources":[{"listingId":"610e3462-bce4-4414-89c1-2eea29076163","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/185","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.527Z","lastSeenAt":"2026-04-22T02:32:07.168Z"}],"details":{"listingId":"610e3462-bce4-4414-89c1-2eea29076163","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/185 \\\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 provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/185"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to services without subscription commitments"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.885Z"},"updatedAt":"2026-04-22T02:32:07.168Z"}}