{"id":"c03e1d7e-1a87-4627-84d4-d70b8aa4f99a","shortId":"5CHWzk","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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/36` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call via the x402 exact payment scheme. No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing. The `/api/v1/keys/36` endpoint's exact purpose is not documented beyond \"Premium API Access,\" so it may serve as a key-provisioning or meta-access endpoint rather than a domain-specific data call.\n\nPayments are made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base mainnet. The x402 challenge specifies a 300-second payment timeout. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl.","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":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/keys/36 ('Premium API Access') is unclear — it may be a meta/key-provisioning endpoint rather than a data endpoint","No request body or response body examples found in crawl","Pricing and /api pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/36","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/36","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific function of /api/v1/keys/36 is undocumented beyond its title. The crawl yielded only a landing page listing endpoints with no deeper 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'/request':19,38,166 '0.02':18,37,86,165 '000':80 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':208 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':211 '20':79 '300':220 'access':74,180,193 'address':207 'advertis':103 'ai':12,31,133 'ai-inference' 'analysi':137 'analyt':127 'api':5,24,45,73,96,179 'attach':106 'base':8,27,63,81,213 'base network api' 'beyond':177 'broad':50 'call':4,23,88,202 'caller':104 'catalog':51 'categori':125 'challeng':217 'charg':76 'classif':140 'classification' 'convers':157 'crawl':237 'crypto-quotes' 'data':11,30,126,130,201 'data-analytics' 'detail':227 'document':176,229 'domain':199 'domain-specif':198 'embed':141 'embeddings' 'enabl':44 'endpoint':16,35,57,67,122,161,170,194 'estim':151 'exact':92,172 'exampl':232 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'finance-data' 'found':234 'four':124 'gas':150 'generat':158 'geocod':155 'geocoding' 'header':111 'i.e':85 'infrastructur':153 'insight':132 'key':97,188 'key-provis':187 'label':71 'learn':135 'limit':101 'list':160 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':134 'made':205 'mainnet':214 'may':183 'meta':192 'meta-access':191 'metric':128 'micropayment api' 'network':64 'offer':10,29 'openapi':225 'organ':120 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':93,110,116,203,222 'per':3,22,55,87 'platform':6,25,46,119 'premium':72,178 'price':144,167 'proof':117 'provid':48 'provis':189 'purpos':173 'quot':149 'rate':100,147 'rather':195 'report':129 'request':56 'request/response':228 'schema':226 'scheme':94 'second':221 'sentiment':136 'sentiment-analysis' 'serv':184 'settl':58 'share':162 'simpli':105 'specif':66,200 'specifi':218 'subscript':98 'summar':139 'text':138 'text-summarization' 'timeout':223 'token':148 'unit':82 'usag':231 'usdc':9,28,60,84,210 'usdc api' 'usdc-base' 'use':209 'util':15,34,154 'utility-apis' 'valid':114,156 'via':89 'web3':143 'x':109 'x-payment':108 'x402':43,91,115,216 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e0d0eb87-d964-4ba1-833c-57668f6e5c5f","listingId":"c03e1d7e-1a87-4627-84d4-d70b8aa4f99a","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.312Z"}],"sources":[{"listingId":"c03e1d7e-1a87-4627-84d4-d70b8aa4f99a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.312Z","lastSeenAt":"2026-04-22T01:02:18.571Z"}],"details":{"listingId":"c03e1d7e-1a87-4627-84d4-d70b8aa4f99a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/36"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/36"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates via pay-as-you-go calls","Geocoding and data validation utilities for automated pipelines"],"bestFor":["AI agents needing frictionless, keyless API access with crypto micropayments","Developers who want pay-per-use pricing without subscriptions or rate limits","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume batch workloads where per-call pricing becomes expensive compared to flat-rate plans","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.019Z"},"updatedAt":"2026-04-22T01:02:18.571Z"}}