{"id":"0d17e3d0-6c31-42cb-9496-1471f02c2947","shortId":"mcTLWz","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints across four 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/orders/57` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is handled via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment authorization, and the server settles on-chain before returning the response. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind `/api/v1/orders/57` is unclear beyond its \"Premium API Access\" label. The broader platform appears to be a demonstration or early-stage service showcasing x402 micropayments across multiple API categories.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 api","micropayment api","pay per call api","base network api","usdc api payment","lowpaymentfee","402 payment api","crypto api access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/orders/57 ('Premium API Access') has no description of what it actually returns","The broader platform lists many endpoints but none have documented input/output schemas","Early-stage or demonstration service — reliability and longevity are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/57","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/orders/57","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The purpose of /api/v1/orders/57 specifically is unclear. This is effectively a stub 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'/api/v1/orders/57':117,238 '/call':12,31 '/docs':190 '/pricing':192 '/readme':194 '0.02':11,30,94,142 '000':131 '0x8335':136 '20':130 '2913':137 '300':183 '402':230 '402 payment api' '6':146 'access':123,245 'across':53,263 'actual':235 'advertis':125 'ai':15,34,63 'ai-inference' 'analysi':67 'analyt':57 'api':5,24,45,106,122,244,265 'appear':250 'author':167 'avail':220 'base':8,27,102,132,139 'base network api' 'behind':237 'beyond':241 'broader':248 'caller':156 'captur':232 'categori':55,266 'chain':174 'challeng':231 'classif':70 'classification' 'commit':111 'confirm':228 'connect':200 'content':206 'convers':87 'cost':128 'crawl':223 'crypto api access' 'data':14,33,56,60 'data-analytics' 'decim':147 'demonstr':254 'document':185,215 'earli':257 'early-stag':256 'embed':71 'embeddings' 'enabl':44 'endpoint':19,38,52,90,115,226 'equal':141 'estim':81 'exact':154 'exampl':219 'exchang':76 'export':61 'extrem':187 'feed':75 'financ':16,35,72 'finance-data' 'four':54 'function':236 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':143 'handl':150 'header':162 'includ':157 'infrastructur':83 'insight':62 'key':107 'label':246 'learn':65 'limit':109 'list':119 'live':229 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'materi':224 'maximum':127 'metric':58 'micropay':262 'micropayment api' 'multipl':264 'network':103 'offer':48 'on-chain':172 'openapi':210 'page':195 'paid':97 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':148,161,166,180 'per':3,22,95 'platform':6,25,46,249 'premium':121,243 'price':74,92 'prompt':202 'quot':79 'rate':77,108 'render':197 'report':59 'request':4,23,96 'request/response':213 'requir':112 'respons':178 'return':176 'schema':214 'scheme':155 'second':184 'sentiment':66 'sentiment-analysis' 'server':170 'servic':259 'settl':171 'showcas':260 'sign':165 'spars':188 'spec':211 'specif':114 'stage':258 'suit':50 'summar':69 'text':68 'text-summarization' 'timeout':181 'token':78 'unclear':240 'unit':133 'usag':218 'usdc':99,135,144 'usdc api payment' 'usdc-base' 'util':18,37,84 'utility-apis' 'valid':86 'via':9,28,151 'wallet':201 'web3':73 'x':160 'x-payment':159 'x402':10,29,43,153,261 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"839f4544-648c-4821-94f4-93900fbd048f","listingId":"0d17e3d0-6c31-42cb-9496-1471f02c2947","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/orders/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:01.010Z"}],"sources":[{"listingId":"0d17e3d0-6c31-42cb-9496-1471f02c2947","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:01.010Z","lastSeenAt":"2026-04-23T19:00:39.943Z"}],"details":{"listingId":"0d17e3d0-6c31-42cb-9496-1471f02c2947","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/57"},{"claim":"Payment timeout is 300 seconds, x402 version 1, exact scheme","source_url":"https://lowpaymentfee.com/api/v1/orders/57"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-request basis","Running data analytics queries and exporting data with instant pay-per-use pricing","Using geocoding, validation, and conversion utilities without rate limits or subscriptions"],"bestFor":["Developers wanting zero-signup, pay-per-call API access via crypto","AI agents that can autonomously pay for API calls using x402 on Base","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing SLAs, guaranteed uptime, or detailed documentation","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas and error handling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.108Z"},"updatedAt":"2026-04-23T19:00:39.943Z"}}