{"id":"1dc37d9f-a86b-4b90-b2e7-d20688ae21ca","shortId":"3pBFjG","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/inbox/39` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each POST request.\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.\n\nHowever, the specific `/api/v1/inbox/39` path does not clearly map to any of the named endpoints on the landing page. There is no OpenAPI schema, no request/response documentation, and no examples available from the crawl. The endpoint is confirmed live (returns a valid x402 402 challenge), but what it actually returns upon successful payment is unknown. Callers should treat this as an opaque premium endpoint until further documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The path /api/v1/inbox/39 does not correspond to any documented endpoint on the landing page — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","No examples of successful responses exist in the crawl material.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/39","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/39","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 there is no OpenAPI schema, no request/response documentation, and the specific /api/v1/inbox/39 path is not described anywhere on the site. The purpose of this particular endpoint is entirely 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'/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '402':203 '6':90 'access':75 'actual':208 'advertis':99,114 'ai':12,31,125 'analysi':129 'analyt':119 'api':5,24,45,74,93 'attach':102 'avail':190 'base':8,27,63,85 'base network api' 'base-network' 'broad':50 'call':4,23 'caller':100,215 'catalog':51 'categori':117 'challeng':204 'classif':132 'clear':167 'confirm':197 'convers':149 'cost':77 'crawl':193 'data':11,30,118,122 'decim':91 'document':186,226 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,174,195,223 'estim':143 'exampl':189 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'four':115 'gas':142 'generat':150 'geocod':147 'header':106 'howev':160 'infrastructur':145 'insight':124 'key':94 'land':177 'learn':127 'limit':97 'list':71,152 'live':198 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':126 'map':168 'metric':120 'micropayment api' 'name':173 'network':64 'no-api-key' 'offer':10,29 'opaqu':221 'openapi':182 'page':178 'path':164 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':105,212 'per':3,22,55,81 'platform':6,25,46,113 'post':109 'post-endpoint' 'premium':73,222 'price':136,159 'provid':48 'quot':141 'rate':96,139 'report':121 'request':56,82,110 'request/response':185 'return':199,209 'schema':183 'sentiment':128 'settl':58 'share':154 'simpli':101 'specif':66,162 'success':211 'summar':131 'surfac':227 'text':130 'token':140 'treat':217 'unit':86 'unknown':214 'upon':210 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,146 'valid':148,201 'web3':135 'wider':112 'x402':43,104,202 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c06b8462-91a9-453e-9a31-1a5dbcd2d688","listingId":"1dc37d9f-a86b-4b90-b2e7-d20688ae21ca","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.449Z"}],"sources":[{"listingId":"1dc37d9f-a86b-4b90-b2e7-d20688ae21ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.449Z","lastSeenAt":"2026-04-22T04:02:45.863Z"}],"details":{"listingId":"1dc37d9f-a86b-4b90-b2e7-d20688ae21ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/39"},{"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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/39"}],"useCases":["Programmatic access to premium API data without subscription or API key management","Agent-driven workflows that need on-demand paid endpoints with crypto settlement","Exploring x402 payment protocol integration for per-request billing"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","AI agents that need keyless, instant API access on Base","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.331Z"},"updatedAt":"2026-04-22T04:02:45.863Z"}}