{"id":"35e84b81-d94e-4862-b106-7f8871ca1454","shortId":"uvP26d","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 `/api/v1/keys/5` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely sparse. There is no OpenAPI spec, no request/response schema documentation, and the crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. The exact behavior, input parameters, and response format of `/api/v1/keys/5` (or any other endpoint) are not documented in the crawled material. The endpoint is live and returns a valid x402 402 challenge, but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","premium-api-access","no-api-key-required"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality and response format of /api/v1/keys/5 is undocumented","All non-root crawled pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/5","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the purpose of '/api/v1/keys/5' specifically is unclear beyond the label 'Premium API Access'. The /api, /pricing, and /README pages yielded no useful content. This is effectively a stub 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'/api/v1/keys/5':68,212 '/pricing':188 '/readme':190 '/request':19,38,167 '0.02':18,37,79,166 '000':83 '20':82 '402':233 '402 payment api' '6':89 'access':74 'account':101 'actual':238 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,73,99 'attach':108 'base':8,27,63,84 'base network api' 'behavior':205 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':125 'challeng':234 'classif':140 'connect':196 'content':202 'convers':157 'cost':76 'crawl':186,222 'data':11,30,126,130 'decim':90 'document':171,183,219 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,160,216,225 'estim':151 'exact':204 'exchang':146 'export':131 'extrem':173 'feed':145 'financ':13,32,142 'format':210 'four':123 'gas':150 'generat':158 'geocod':155 'handl':93 'header':113 'howev':170 'infrastructur':153 'input':206 'insight':132 'key':100 'learn':135 'list':70,162 'live':227 'low payment fee' 'lowpaymentfee.com':39 'machin':134 'materi':223 'metric':128 'micropayment api' 'network':64 'no-api-key-required' 'offer':10,29 'openapi':178 'page':191 'paramet':207 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,112,117,241 'per':3,22,55,80 'platform':6,25,46,121 'point':169 'premium':72 'premium-api-access' 'price':144,168 'prompt':198 'proof':118 'protocol':97 'provid':48 'quot':149 'rate':147 'report':129 'request':56 'request/response':181 'requir':105 'respons':209 'return':193,229,239 'schema':182 'sentiment':136 'settl':58 'simpli':107 'spars':174 'spec':179 'specif':66 'subscript':103 'summar':139 'text':138 'token':148 'unit':85 'unknown':243 'usdc':9,28,60,87 'usdc api' 'usdc-base' 'util':15,34,154 'valid':116,156,231 'via':94 'wallet':197 'web3':143 'wider':120 'x':111 'x-payment':110 'x402':43,96,232 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0fe43a5c-d87a-402d-ac93-f2039d621ee8","listingId":"35e84b81-d94e-4862-b106-7f8871ca1454","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.778Z"}],"sources":[{"listingId":"35e84b81-d94e-4862-b106-7f8871ca1454","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.778Z","lastSeenAt":"2026-04-22T01:02:19.189Z"}],"details":{"listingId":"35e84b81-d94e-4862-b106-7f8871ca1454","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/5 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/5"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/5"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to a premium API resource via x402 micropayments","Testing x402 payment flows on Base with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Low-volume consumers who want no commitments or rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.245Z"},"updatedAt":"2026-04-22T01:02:19.189Z"}}