{"id":"ad00da19-9383-46f2-ad84-4115ca81f508","shortId":"K7QCQQ","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 `/api/v1/inbox/128` 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 subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe broader 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. The platform claims no rate limits and no minimum commitments.\n\nImportant caveat: the specific functionality behind `/api/v1/inbox/128` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually does when paid is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation exists for the specific endpoint /api/v1/inbox/128 — its actual functionality is unknown","No OpenAPI schema, request format, or response format is available","The /api, /pricing, and /README pages returned no useful content (just 'Connect wallet')","The 'inbox' path segment is unusual and may indicate a mailbox or messaging function, but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/128","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/inbox/128","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 zero documentation on what /api/v1/inbox/128 actually does, no request/response schema, and no examples. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub 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'/request':19,38,168 '0.02':18,37,79,167 '000':83 '20':82 '402':221 '6':89 'Base network API' 'USDC API' 'access':74,195 'account':101 'actual':226 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,73,99,194 'attach':107 'avail':208,234 'base':8,27,63,84 'base-network' 'behind':185 'beyond':190 'broad':50 'broader':122 'call':4,23,81 'caller':106 'catalog':51 'categori':127 'caveat':181 'challeng':222 'claim':172 'classif':142 'commit':179 'confirm':216 'convers':159 'cost':76 'crawl':211 'data':11,30,128,132 'decim':90 'detail':206 'document':189,207 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,214 'estim':153 'exampl':203 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':184 'gas':152 'generat':160 'geocod':157 'handl':93 'header':112 'http-post' 'import':180 'infrastructur':155 'insight':134 'key':100 'label':192 'learn':137 'limit':175 'list':70,162 'live':217 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'materi':235 'metric':130 'micropayment API' 'minimum':178 'network':64 'no-api-key' 'offer':10,29 'openapi':199 'page':212 'paid':229 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,111,117 'per':3,22,55,80 'platform':6,25,46,123,171 'premium':72,193 'premium API access' 'price':146,169 'protocol':97 'provid':48 'quot':151 'rate':149,174 'report':131 'request':56,120 'request/response':202 'requir':105 'return':218 'schema':200 'sentiment':138 'settl':58 'share':164 'sign':115 'specif':66,183 'subscript':103 'summar':141 'text':140 'token':150 'unit':85 'unknown':231 'usdc':9,28,60,87,116 'usdc-settlement' 'util':15,34,156 'valid':158,220 'via':94 'web3':145 'x':110 'x-payment':109 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c4b28ea3-d490-499a-b5d1-137c0af1d5ee","listingId":"ad00da19-9383-46f2-ad84-4115ca81f508","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/inbox/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.370Z"}],"sources":[{"listingId":"ad00da19-9383-46f2-ad84-4115ca81f508","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/128","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.370Z","lastSeenAt":"2026-04-22T15:02:58.047Z"}],"details":{"listingId":"ad00da19-9383-46f2-ad84-4115ca81f508","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/128 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/inbox/128"},{"claim":"All listed 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/inbox/128"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven workflows that need instant, keyless API access settled in USDC","Testing x402 payment flows on Base network"],"bestFor":["Developers or agents wanting frictionless pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Use cases where avoiding API key management is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.141Z"},"updatedAt":"2026-04-22T15:02:58.047Z"}}