{"id":"35b3ccc1-881b-489f-8f37-0c3f9a19db71","shortId":"Avb9sK","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, no rate limits, and no minimum commitments.\n\nThe specific endpoint being listed here (`/api/v1/orders/22`) is described as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. 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 timeout for payment settlement is 300 seconds.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical 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 (returns a proper 402 challenge), but what the `/api/v1/orders/22` endpoint actually returns upon successful payment is unknown from the available sources.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api access","no-api-key endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","The specific endpoint /api/v1/orders/22 is not listed among the advertised APIs on the landing page; its actual function is unclear","No examples or error documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/22","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/22","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages beyond the landing page are empty (\"Connect wallet\" only). The specific purpose of /api/v1/orders/22 is unclear — it's labeled generically as \"Premium API Access\" with no further 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'/api/v1/orders/22':121,244 '/call':12,31 '/docs':195 '/pricing':197 '/readme':199 '0.02':11,30,94,146 '000':135 '0x8335':140 '20':134 '2913':141 '300':184 '402':239 'access':127 'across':53 'actual':246 'addit':210 'advertis':129 'ai':15,34,63 'ai-inference' 'analysi':67 'analyt':57 'api':5,24,45,106,126 'author':166 'avail':226,255 'base':8,27,102,136,143 'base usdc api' 'beyond':187 'caller':155 'categori':55 'chain':173 'challeng':240 'classif':70 'classification' 'commit':114 'confirm':234 'connect':205 'content':212 'convers':87 'cost':132 'crawl':229 'crypto api access' 'data':14,33,56,60 'data-analytics' 'describ':123 'document':186,221 'embed':71 'embeddings' 'enabl':44 'endpoint':19,38,52,90,117,232,245 'equal':145 'estim':81 'exact':153 'exampl':225 'exchang':76 'export':61 'extrem':192 'feed':75 'financ':16,35,72 'finance-data' 'four':54 'gas':80 'generat':88 'geocod':85 'geocoding' 'handl':149 'header':161 'includ':156 'infrastructur':83 'insight':62 'key':107 'land':189 'learn':65 'limit':110 'list':119 'live':235 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'materi':230 'maximum':131 'metric':58 'micropayment api' 'minimum':113 'network':103 'no-api-key endpoint' 'offer':48 'on-chain':171 'openapi':216 'page':190,200 'paid':97 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':147,160,165,181,250 'per':3,22,95 'platform':6,25,46 'premium':125 'price':74,92 'prompt':207 'proper':238 'quot':79 'rate':77,109 'render':202 'report':59 'request':4,23,96 'request/response':219 'respons':177 'return':175,236,247 'schema':220 'scheme':154 'second':185 'sentiment':66 'sentiment-analysis' 'server':169 'settl':170 'settlement':182 'sign':164 'sourc':256 'spars':193 'spec':217 'specif':116 'success':249 'suit':50 'summar':69 'technic':211 'text':68 'text-summarization' 'timeout':179 'token':78 'unit':137 'unknown':252 'upon':248 'usag':224 'usdc':99,139 'usdc-base' 'util':18,37,84 'utility-apis' 'valid':86 'via':9,28,150 'wallet':206 'web3':73 'x':159 'x-payment':158 'x402':10,29,43,152 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"233a0803-4dab-4054-aa86-0e6b9348387b","listingId":"35b3ccc1-881b-489f-8f37-0c3f9a19db71","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:48.797Z"}],"sources":[{"listingId":"35b3ccc1-881b-489f-8f37-0c3f9a19db71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:48.797Z","lastSeenAt":"2026-04-23T14:30:36.575Z"}],"details":{"listingId":"35b3ccc1-881b-489f-8f37-0c3f9a19db71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/22 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/22"},{"claim":"Payment timeout is 300 seconds, scheme is exact, x402 version 1","source_url":"https://lowpaymentfee.com/api/v1/orders/22"}],"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-call basis","Running data analytics queries and exporting reports with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion without rate limits"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where a flat-rate subscription would be cheaper","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.858Z"},"updatedAt":"2026-04-23T14:30:36.575Z"}}