{"id":"38a4e213-0fcf-4d6a-8209-5728c7742e1b","shortId":"PFVcfP","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/122` 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, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe 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/122` endpoint is unclear from available documentation — it is labeled generically as \"Premium API Access\" and does not appear in the public catalog on the landing page. The endpoint is live and returns a valid x402 challenge with USDC on Base. No OpenAPI schema, request/response examples, or detailed documentation were found beyond the landing page listing.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The endpoint /api/v1/inbox/122 does not appear in the provider's public API catalog — its specific functionality is unknown.","No OpenAPI schema, request body format, or response examples are available.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The platform lists many endpoint categories but no documentation verifying they are functional was found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/122","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific purpose of /api/v1/inbox/122 is undocumented. No OpenAPI schema, request/response examples, or detailed docs exist. The landing page lists many endpoints but this specific one is absent from the catalog. Effectively a stub 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'/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '6':90 'access':75,179 'advertis':114 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,178 'appear':183 'attach':104 'avail':170 'base':8,27,63,85,205 'base network api' 'beyond':216 'broad':50 'call':4,23 'caller':102 'catalog':51,187 'categori':117 'challeng':201 'classif':132 'commit':99 'convers':149 'cost':77 'data':11,30,118,122 'data-analytics' 'decim':91 'detail':212 'document':171,213 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,166,193 'estim':143 'exampl':210 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'found':215 'four':115 'gas':142 'generat':150 'generic':175 'geocod':147 'header':108 'infrastructur':145 'insight':124 'key':94 'label':174 'land':190,218 'learn':127 'limit':96 'list':71,152,220 'live':195 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':207 'page':191,219 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':107 'per':3,22,55,81 'platform':6,25,46,113 'premium':73,177 'premium api access' 'price':136,159 'provid':48 'public':186 'purpos':162 'quot':141 'rate':95,139 'report':121 'request':56,82,111 'request/response':209 'requir':101 'return':197 'schema':208 'sentiment':128 'settl':58 'share':154 'simpli':103 'specif':66,161 'summar':131 'text':130 'token':140 'unclear':168 'unit':86 'upfront':98 'usdc':9,28,60,88,203 'usdc api' 'usdc-base-settlement' 'util':15,34,146 'utility-services' 'valid':148,199 'web3':135 'x402':43,106,200 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4319c809-522c-48b1-ba2e-7da2cf633f91","listingId":"38a4e213-0fcf-4d6a-8209-5728c7742e1b","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.426Z"}],"sources":[{"listingId":"38a4e213-0fcf-4d6a-8209-5728c7742e1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/122","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.426Z","lastSeenAt":"2026-04-22T11:32:55.958Z"}],"details":{"listingId":"38a4e213-0fcf-4d6a-8209-5728c7742e1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/122 \\\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/122"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","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/122"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["AI agents needing low-friction, keyless API access with crypto micropayments","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Applications requiring diverse utility endpoints (AI, finance, geo, data) from a single provider"],"notFor":["Users who need free or fiat-only payment options","High-volume batch processing where per-request pricing becomes expensive","Use cases requiring detailed SLAs, uptime guarantees, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.998Z"},"updatedAt":"2026-04-22T11:32:55.958Z"}}