{"id":"e1327803-8d5e-4ec9-8780-d60285e8f2bb","shortId":"PwFf7j","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/67` 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 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 listed at the same $0.02/request price point. The site claims no rate limits, no minimums, and instant access.\n\nHowever, the specific endpoint being listed here (`/api/v1/inbox/67`) does not clearly map to any of the named categories on the landing page. Its purpose is described only as \"Premium API Access\" with no further documentation, input schema, or example responses available. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Without documentation or an OpenAPI spec, the actual functionality of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"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 available for /api/v1/inbox/67 — its actual functionality is unknown","No OpenAPI or schema definition found for any endpoint","The /api, /pricing, and /README pages returned no useful content (wallet-connect wall)","The endpoint path '/api/v1/inbox/67' does not match any of the advertised API categories on the landing page","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/67","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no input/output schema, and no example responses. The specific endpoint /api/v1/inbox/67 has no description beyond its generic title. The /api, /pricing, and /README pages are all empty behind a wallet-connect 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'/api/v1/inbox/67':68,188 '/pricing':224 '/readme':226 '/request':19,38,167 '0.02':18,37,79,166 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'access':74,180,211 'account':101 'actual':246 'addit':237 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,73,99,210 'attach':108 'avail':221 'base':8,27,63,84 'base-network' 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':125,198 'claim':172 'classif':140 'clear':191 'connect':232 'content':238 'convers':157 'cost':76 'data':11,30,126,130 'decim':90 'describ':206 'document':215,240 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,160,184,251 'estim':151 'exampl':219 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'four':123 'function':247 'gas':150 'generat':158 'geocod':155 'handl':93 'header':113 'howev':181 'infrastructur':153 'input':216 'insight':132 'instant':179 'json-response' 'key':100 'land':201 'learn':135 'limit':175 'list':70,162,186 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':134 'map':192 'metric':128 'micropayment API' 'minimum':177 'name':197 'network':64 'no-api-key' 'offer':10,29 'openapi':243 'page':202,227 'particular':250 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,112,117 'per':3,22,55,80 'platform':6,25,46,121 'point':169 'post-method' 'premium':72,209 'premium API access' 'price':144,168 'prompt':234 'proof':118 'protocol':97 'provid':48 'purpos':204 'quot':149 'rate':147,174 'remain':252 'report':129 'request':56 'requir':105 'respons':220 'return':229 'schema':217 'sentiment':136 'settl':58 'simpli':107 'site':171 'spec':244 'specif':66,183 'subscript':103 'summar':139 'text':138 'token':148 'unclear':253 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,154 'valid':116,156 'via':94 'wallet':233 'web3':143 'wider':120 'without':239 'x':111 'x-payment':110 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e92b6f94-81c4-461b-b310-819a0b906906","listingId":"e1327803-8d5e-4ec9-8780-d60285e8f2bb","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.683Z"}],"sources":[{"listingId":"e1327803-8d5e-4ec9-8780-d60285e8f2bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.683Z","lastSeenAt":"2026-04-22T05:32:22.723Z"}],"details":{"listingId":"e1327803-8d5e-4ec9-8780-d60285e8f2bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/67"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/67"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven workflows that need on-demand API calls settled in crypto","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or high-volume bulk access","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52Z"},"updatedAt":"2026-04-22T05:32:22.723Z"}}