{"id":"da49a18b-bb18-4060-b5e4-e7ccdd940202","shortId":"hwbk8V","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 exposes a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/66` is listed as \"Premium API Access\" and accepts POST requests with a maximum cost of $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind `/api/v1/inbox/66` is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\") with payment directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The timeout is 300 seconds. 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":["api-platform","crypto"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["The exact functionality of /api/v1/inbox/66 is unknown — 'Premium API Access' is the only description available","No OpenAPI or request/response schema was found; callers cannot know what to send or expect back","Documentation, pricing, and README pages all returned only a 'Connect wallet' stub with no useful content","The platform lists many endpoint categories but none map clearly to /api/v1/inbox/66"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/66","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/66","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 challenge, but the specific functionality of /api/v1/inbox/66 is completely undocumented. No OpenAPI schema, no request/response examples, and no description beyond the generic 'Premium API Access' label. The crawl yielded only a landing page listing other endpoints and wallet-connect stubs for docs/pricing 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'/request':19,38,165 '0.02':18,37,85,164 '000':89 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':210 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':213 '1':202 '20':88 '300':219 '402 payment api' '6':95 'accept':77 'access':75,181 'address':209 'advertis':104,121 'ai':12,31,132 'analysi':136 'analyt':126 'api':5,24,45,74,98,180 'base':8,27,63,90,215 'base network api' 'behavior':186 'behind':171 'beyond':176 'broad':50 'call':4,23,87 'caller':105 'catalog':51 'categori':124 'challeng':200 'classif':139 'convers':156 'cost':83 'crawl':234 'data':11,30,125,129 'decim':96 'detail':224 'direct':207 'document':175,226 'embed':140 'enabl':44 'endpoint':16,35,57,67,123,160,190 'estim':150 'exact':185,204 'exampl':229 'exchang':145 'export':130 'expos':48 'feed':144 'financ':13,32,141 'form':198 'found':231 'four':122 'function':170 'gas':149 'generat':157 'generic':178 'geocod':154 'header':117 'howev':167 'infrastructur':152 'insight':131 'key':99 'label':182 'learn':134 'limit':102 'list':71,159 'live':192 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':133 'maximum':82 'metric':127 'micropayment api' 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':222 'pay':2,21,54,106 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':116,206 'per':3,22,55,86,107 'platform':6,25,46,120 'post':78 'post-endpoint' 'premium':73,179 'price':143,166 'protocol':112 'quot':148 'rate':101,146 'report':128 'request':56,79,108 'request/response':225 'return':194 'schema':223 'scheme':203 'second':220 'sentiment':135 'settl':58 'share':161 'specif':66,169 'summar':138 'text':137 'timeout':217 'token':147 'unclear':188 'unit':91 'usag':228 'usdc':9,28,60,93,212 'usdc api' 'usdc-base' 'use':211 'util':15,34,153 'valid':155 'version':201 'via':109 'web3':142 'well':197 'well-form':196 'wider':119 'x':115 'x-payment':114 'x402':43,111,199 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"15e2f438-6693-4ebf-aa85-2ba28d526f35","listingId":"da49a18b-bb18-4060-b5e4-e7ccdd940202","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.039Z"}],"sources":[{"listingId":"da49a18b-bb18-4060-b5e4-e7ccdd940202","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.039Z","lastSeenAt":"2026-04-22T01:02:16.856Z"}],"details":{"listingId":"da49a18b-bb18-4060-b5e4-e7ccdd940202","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/66 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/66"},{"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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/inbox/66"}],"useCases":["Programmatic access to a premium API endpoint without managing API keys or subscriptions","Agent-driven workflows that need on-demand, pay-per-call data or utility services","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need keyless, pay-as-you-go API access","Low-volume or bursty workloads where per-request pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.006Z"},"updatedAt":"2026-04-22T01:02:16.856Z"}}