{"id":"e2e34552-0eec-4bc1-b938-6f09378e8b4a","shortId":"spWDhx","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 hosts a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/inbox/193` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The response MIME type is application/json. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no detailed input/output schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns HTTP 402 with a well-formed x402 challenge).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — input parameters and response format for /api/v1/inbox/193 are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The purpose of the specific 'inbox/193' endpoint is unclear; it may be a generic or placeholder route","No rate-limit or SLA information is documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/193","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no input/output schema documentation, no usage examples, and the specific purpose of /api/v1/inbox/193 is entirely unclear beyond the generic label 'Premium API Access'. Most site pages return only a wallet-connect 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'/api/v1/inbox/193':117 '/pricing':201 '/readme':203 '/request':19,38 '0.02':18,37,70,147,189 '000':136 '0x8335':141 '20':135 '2913':142 '402':240 '6':151 'accept':125 'access':123 'advertis':131 'ai':12,31,57 'ai-inference' 'also':162 'analysi':167 'analyt':56 'api':5,24,45,88,122 'application/json':158 'attach':99 'avail':229 'base':8,27,78,137,144 'base network api' 'beyond':193 'broad':50 'broader':160 'call':4,23 'caller':97 'challeng':130,247 'classif':170 'classification' 'collect':51 'commit':96 'confirm':236 'connect':209 'content':215 'convers':182 'crawl':232 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':152 'detail':222 'document':192 'embed':171 'embeddings' 'enabl':44 'endpoint':16,35,53,66,115,164,234 'equal':146 'estim':179 'everi':65 'exampl':228 'exchang':174 'expos':163 'feed':173 'financ':13,32,60 'finance-data' 'form':245 'gas':178 'generat':184 'geocod':180 'geocoding' 'given':148 'header':104 'host':48 'http':239 'infrastructur':63 'input/output':223 'key':89 'land':195 'learn':59 'limit':92 'list':119 'live':237 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':133 'micropayment api' 'mime':155 'minimum':95 'network':79 'no-api-key endpoint' 'offer':10,29 'openapi':219 'page':196 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,103,108 'per':3,22,71 'platform':6,25,46,161 'point':191 'post':126 'premium':121 'price':68,172,190 'prompt':211 'proof':109 'protocol':84 'quot':177 'rate':91,175 'request':72,112,127 'resolv':206 'respons':154 'return':238 'rout':204 'schema':224 'sentiment':166 'sentiment-analysis' 'settl':73 'simpli':98 'span':54 'spars':198 'spec':220 'specif':114 'summar':169 'text':168 'text-summarization' 'token':176 'type':156 'unit':138 'usag':227 'usdc':9,28,75,140,149 'usdc api' 'usdc-base' 'util':15,34,64 'utility-apis' 'valid':107,181 'via':80 'wallet':210 'web3':61 'well':244 'well-form':243 'x':102 'x-payment':101 'x402':43,82,129,246 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"730fb448-8d3a-4b0a-90f1-09d7dddbe5a1","listingId":"e2e34552-0eec-4bc1-b938-6f09378e8b4a","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.776Z"}],"sources":[{"listingId":"e2e34552-0eec-4bc1-b938-6f09378e8b4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.776Z","lastSeenAt":"2026-04-22T10:02:56.083Z"}],"details":{"listingId":"e2e34552-0eec-4bc1-b938-6f09378e8b4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/193 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/193","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402_payment_proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/193"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto token quotes and gas estimates","Geocoding and data validation as utility microservices"],"bestFor":["AI agents that need frictionless, key-less API access with crypto micropayments","Developers prototyping integrations who want zero-commitment pay-as-you-go pricing","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads that need bulk pricing or SLAs","Users who require detailed API documentation, SDKs, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.492Z"},"updatedAt":"2026-04-22T10:02:56.083Z"}}