{"id":"01b2ba5c-5691-41bf-8927-68038ca04a68","shortId":"tc42ED","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 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/keys/100` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the platform's uniform pricing. Payment is handled via the x402 protocol: callers send an X-PAYMENT header with a signed payment payload, and the server verifies on-chain settlement before returning the response. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nDocumentation is minimal. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The exact functionality of the `/api/v1/keys/100` endpoint is unclear — the name \"Premium API Access\" suggests it may provision or return API keys, but this is unconfirmed. Agents should treat this endpoint with caution until more documentation is available.","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","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation, OpenAPI spec, or request/response schemas available","The exact functionality of /api/v1/keys/100 ('Premium API Access') is unclear — it may provision keys or serve as a generic access endpoint","All secondary pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No rate limit or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/100","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/keys/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific purpose of /api/v1/keys/100 is ambiguous. Effectively a stub 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'/api/v1/keys/100':108,229 '/pricing':208 '/readme':210 '/request':19,38 '0.02':18,37,95,127,129 '000':122 '20':121 'access':114,237 'across':54 'addit':222 'agent':250 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,113,171,236,244 'avail':192,261 'bare':216 'base':8,27,103,123 'base network api' 'broad':50 'call':4,23,181 'caller':144 'carri':116 'categori':56 'caution':256 'chain':162 'charg':119 'classif':71 'classification' 'commit':179 'connect':217 'consist':130 'content':223 'convers':88 'data':11,30,57,61 'data-analytics' 'descript':202 'document':185,259 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,107,193,230,254 'estim':82 'exact':225 'exampl':205 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':226 'gas':81 'generat':89 'geocod':86 'geocoding' 'handl':139 'header':150 'independ':183 'infrastructur':84 'insight':63 'key':172,245 'land':189 'learn':66 'limit':175 'list':110,191 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'maximum':118 'may':240 'metric':59 'micropayment api' 'minim':187 'name':234 'network':104 'offer':10,29 'on-chain':160 'page':190,211 'paid':184 'paramet':201 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':155 'payment':137,149,154 'per':3,22,96 'platform':6,25,46,133 'premium':112,235 'price':75,93,136,195 'prompt':219 'protocol':143 'provid':48,197 'provis':241 'quot':80 'rate':78,174 'report':60 'request':97 'request/response':199 'resolv':213 'respons':167 'return':165,243 'schema':200 'send':145 'sentiment':67 'sentiment-analysis' 'server':158 'settl':98 'settlement':163 'sign':153 'specif':106 'subscript':178 'suggest':238 'suit':51 'summar':70 'text':69 'text-summarization' 'token':79 'treat':252 'unclear':232 'unconfirm':249 'uniform':135 'unit':124 'usag':204 'usdc':9,28,100,126,128 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'verifi':159 'via':140 'wallet':218 'web3':74 'x':148 'x-payment':147 'x402':43,142 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d6fe1fff-3404-441e-b90b-830b683f7798","listingId":"01b2ba5c-5691-41bf-8927-68038ca04a68","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/keys/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.480Z"}],"sources":[{"listingId":"01b2ba5c-5691-41bf-8927-68038ca04a68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.480Z","lastSeenAt":"2026-04-22T01:02:18.812Z"}],"details":{"listingId":"01b2ba5c-5691-41bf-8927-68038ca04a68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per 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 (0.02 USD) on Base for /api/v1/keys/100","source_url":"https://lowpaymentfee.com/api/v1/keys/100"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayment","Running utility operations like geocoding, validation, or data conversion with per-call billing"],"bestFor":["AI agents that need stateless, pay-per-call access to diverse API categories","Developers prototyping with no commitment or subscription overhead","Crypto-native workflows already operating on Base with USDC"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.738Z"},"updatedAt":"2026-04-22T01:02:18.812Z"}}