{"id":"15f3098b-4f8f-4a3c-800a-6d34df67e606","shortId":"9kQxy9","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/5` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each 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\nThe specific purpose of the `/api/v1/inbox/5` endpoint is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, /api) returned only a \"Connect wallet\" prompt with no additional content. The endpoint is live and returns a valid x402 challenge, but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available for /api/v1/inbox/5 — purpose, expected request body, and response format are unknown","No OpenAPI or schema definition found anywhere on the site","Crawled /pricing, /README, and /api pages returned only 'Connect wallet' with no content","The specific function of this endpoint cannot be verified — it may be a placeholder or test endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/5","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/5","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 no OpenAPI schema, no request/response documentation, and the purpose of /api/v1/inbox/5 is entirely unclear beyond the generic label 'Premium API Access'. Crawled pages yielded almost no useful content. This is effectively a stub 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'/api/v1/inbox/5':68,164 '/request':19,38,157 '0.02':18,37,79,156 '000':83 '20':82 '6':89 'access':74,174 'addit':199 'advertis':113 'ai':12,31,124 'analysi':128 'analyt':118 'api':5,24,45,73,92,173 'attach':102 'base':8,27,63,84 'base network api' 'base-network' 'beyond':169 'broad':50 'call':4,23,81 'caller':100 'catalog':51 'categori':116 'challeng':210 'classif':131 'connect':194 'content':200 'convers':148 'cost':76 'crawl':185 'data':11,30,117,121 'decim':90 'difficult':218 'doc':186 'document':168,215 'embed':132 'enabl':44 'endpoint':16,35,57,67,115,152,165,202 'estim':142 'exampl':182 'exchang':137 'expect':229 'export':122 'feed':136 'financ':13,32,133 'four':114 'gas':141 'generat':149 'geocod':146 'header':106 'infrastructur':144 'insight':123 'key':93 'know':220 'label':171 'lack':213 'learn':126 'limit':95 'list':70,151 'live':204 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'make':216 'metric':119 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':178 'page':187 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':222 'payment':105 'per':3,22,55,80 'platform':6,25,46,112 'post-endpoint' 'premium':72,172 'price':135,158,188 'prompt':196 'provid':48 'purpos':161 'quot':140 'rate':94,138 'readm':189 'report':120 'request':56,109 'request/response':181 'requir':99 'respons':227 'return':191,206 'schema':179 'send':224 'sentiment':127 'settl':58 'share':153 'simpli':101 'specif':66,160 'subscript':97 'summar':130 'text':129 'token':139 'unit':85 'usdc':9,28,60,87 'usdc api' 'usdc-settlement' 'util':15,34,145 'valid':147,208 'wallet':195 'web3':134 'wider':111 'x402':43,104,209 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d2051ea1-a1f2-4a4d-b6aa-ad91591d431c","listingId":"15f3098b-4f8f-4a3c-800a-6d34df67e606","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.085Z"}],"sources":[{"listingId":"15f3098b-4f8f-4a3c-800a-6d34df67e606","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.085Z","lastSeenAt":"2026-04-22T12:05:17.704Z"}],"details":{"listingId":"15f3098b-4f8f-4a3c-800a-6d34df67e606","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/5 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/5"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/5"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Exploring x402 payment protocol integrations with a low-cost test endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless pay-per-call API access","Users who want to avoid subscriptions and pay only per request"],"notFor":["Anyone needing well-documented API contracts with clear request/response schemas","High-volume use cases where per-call pricing may add up without volume discounts","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.907Z"},"updatedAt":"2026-04-22T12:05:17.704Z"}}