{"id":"edaee1bf-a0a5-45ce-ad96-a375cae2d358","shortId":"ccsuan","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 settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/145` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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 endpoints are uniformly priced at $0.02 per request.\n\nThe specific functionality behind `/api/v1/messages/145` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no example request/response payloads, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. The endpoint is confirmed live (returns a well-formed 402 challenge), but the lack of documentation means callers cannot determine what this particular endpoint does without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation exists for the /api/v1/messages/145 endpoint — its actual functionality is unknown","No OpenAPI or schema definition is available for any endpoint on the platform","The /pricing, /README, and /api pages all resolve to a minimal 'Connect wallet' page with no content","Cannot verify what 'Premium API Access' delivers without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/145","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what /api/v1/messages/145 actually returns. No OpenAPI schema, no example payloads, and the crawled pages beyond the landing page are empty. The listing is effectively a stub with confirmed pricing and liveness 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'/request':19,38 '0.02':18,37,80,167 '000':84 '20':83 '402':223 '402 payment api' '6':90 'access':75,183 'account':102 'addit':211 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,100,182,200 'attach':110 'base':8,27,63,85 'base network api' 'base-network' 'behind':173 'beyond':178 'broad':50 'call':4,23,82 'caller':108,231 'cannot':232 'catalog':51 'categori':127 'challeng':224 'classif':142 'confirm':216 'connect':206 'convers':159 'cost':77 'crawl':195 'data':11,30,128,132 'decim':91 'detail':212 'determin':233 'doc':196 'document':177,229 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,214,237 'estim':153 'exampl':190 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'form':222 'four':125 'function':172 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'infrastructur':155 'insight':134 'json-response' 'key':101 'label':180 'lack':227 'learn':137 'limit':105 'list':71 'live':217 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'make':240 'mean':230 'metric':130 'micropayment api' 'minim':205 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':187 'page':197 'paid':242 'particular':236 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':192 'payment':92,114,119 'per':3,22,55,81,168 'platform':6,25,46,123 'premium':73,181 'price':146,165,198 'prompt':208 'proof':120 'protocol':98 'provid':48 'quot':151 'rate':104,149 'readm':199 'report':131 'request':56,169,243 'request/response':191 'requir':107 'resolv':202 'return':218 'schema':188 'sentiment':138 'settl':58 'simpli':109 'specif':66,171 'summar':141 'text':140 'token':150 'uniform':164 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,156 'valid':118,158 'via':95 'wallet':207 'web3':145 'well':221 'well-form':220 'wider':122 'without':239 'x':113 'x-payment':112 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"146461ca-c9ff-486a-84e1-9b65725fa30e","listingId":"edaee1bf-a0a5-45ce-ad96-a375cae2d358","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.248Z"}],"sources":[{"listingId":"edaee1bf-a0a5-45ce-ad96-a375cae2d358","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.248Z","lastSeenAt":"2026-04-22T02:32:06.522Z"}],"details":{"listingId":"edaee1bf-a0a5-45ce-ad96-a375cae2d358","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/145 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/145"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/145"}],"useCases":["Agent-driven API consumption where per-call crypto payment replaces traditional API key management","Accessing data, AI inference, or utility endpoints without signup or subscription","Programmatic micropayments for on-demand API services on Base L2"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","x402-compatible clients that can attach USDC payment proofs on Base","Use cases requiring low-cost ($0.02) individual API calls without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers who would benefit from bulk pricing or subscriptions","Callers without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.343Z"},"updatedAt":"2026-04-22T02:32:06.522Z"}}