{"id":"eed958dd-5583-4426-8f84-4a184feb7fdc","shortId":"7qYgnW","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. The platform advertises four categories of endpoints: 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).\n\nThe specific endpoint at `/api/v1/inbox/198` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to wallet 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nNote that the crawled documentation is extremely thin — the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The purpose of the `/api/v1/inbox/198` path specifically is unclear; it does not match any of the advertised API categories listed on the homepage. Without documentation on expected request bodies or response formats, integration requires experimentation.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","http-post","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/inbox/198 path does not match any of the advertised API categories on the homepage — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no usable content","No request body or response body examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/198","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/198","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 there is no OpenAPI spec, no request/response schema, no examples, and the specific /api/v1/inbox/198 path is undocumented. The crawled docs pages are empty beyond a wallet-connect prompt. Effectively a stub 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'/api/v1/inbox/198':122,221 '/call':13,30 '/pricing':189 '/readme':191 '0.02':12,29,61,149 '000':138 '0x1a2b':164 '0x8335':143 '20':137 '2913':144 '300':168 '6':153 '85f3':165 'Base network API' 'USDC API' 'accept':173 'access':46,127 'advertis':80,233 'ai':92 'analysi':96 'analyt':86 'api':5,15,22,32,42,70,126,234 'application/json':178 'avail':216 'base':8,25,66,139,146 'bodi':245 'broad':49 'call':59 'categori':82,235 'challeng':133 'classif':99 'commit':76 'connect':197 'content':203 'convers':116 'cost':60 'crawl':182 'data':85,89 'decim':154 'document':183,212,241 'embed':100 'endpoint':52,84,120,172 'equal':148 'estim':110 'exact':160 'exampl':215 'exchang':105 'expect':243 'experiment':251 'export':90 'extrem':185 'feed':104 'financ':101 'format':248 'four':81 'gas':109 'gate':45 'generat':117 'geocod':114 'given':150 'homepag':239 'http':174 'http-post' 'infrastructur':112 'insight':91 'integr':249 'json-response' 'key':16,33,71 'label':124 'learn':94 'limit':73 'list':236 'live':131 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':93 'made':157 'match':229 'metric':87 'micropayment API' 'network':67 'no-api-key' 'note':179 'openapi':207 'page':192 'path':222 'pay':2,19,39 'pay-per-call' 'pay-per-request':1,18,38 'payment':56,155 'per':3,20,40 'platform':6,23,43,79 'post':175 'premium':125 'price':103 'prompt':199 'protocol':57 'purpos':218 'quot':108 'rate':72,106 'report':88 'request':4,21,41,134,244 'request/response':210 'requir':17,34,77,250 'respons':247 'return':129,177,194 'schema':211 'scheme':161 'second':169 'sentiment':95 'set':50 'spec':208 'specif':119,223 'summar':98 'text':97 'thin':186 'timeout':170 'token':107 'unclear':225 'unit':140 'upfront':75 'usdc':9,26,63,142,151 'usdc-base' 'use':53 'util':113 'valid':115 'via':10,27,158 'wallet':163,198 'web3':102 'without':240 'x402':11,28,55,132 'x402 API' 'x402-payment'","prices":[{"id":"bc50d2ae-6ab9-487b-9b35-508354c2891a","listingId":"eed958dd-5583-4426-8f84-4a184feb7fdc","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.620Z"}],"sources":[{"listingId":"eed958dd-5583-4426-8f84-4a184feb7fdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.620Z","lastSeenAt":"2026-04-22T01:02:15.159Z"}],"details":{"listingId":"eed958dd-5583-4426-8f84-4a184feb7fdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/198 \\\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 homepage lists four API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) each at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/198"}],"useCases":["Accessing data analytics and reports without API key management","Running AI inference (sentiment, summarization, classification, embeddings) on a per-request payment basis","Fetching real-time crypto and finance data (prices, gas estimates, exchange rates)","Using utility services like geocoding, validation, and conversion with instant pay-per-use"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micro-transactions for API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.737Z"},"updatedAt":"2026-04-22T01:02:15.159Z"}}