{"id":"3730a4e2-2ebf-4432-841e-7e01059e3730","shortId":"AYVsKz","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 endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/generate/resource/23` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per call, since USDC uses 6 decimals). Payment is settled on-chain to a specified address using the \"exact\" scheme. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\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 substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the \"Premium API Access\" resource/23 endpoint is unclear — the name and description are generic. Agents should treat this as a low-cost experimental endpoint and verify behavior with a test call.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of 'Premium API Access' at resource/23 is unknown","No examples or sample responses available from any crawled page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/23","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/generate/resource/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the purpose of 'resource/23' is entirely opaque. All non-landing pages returned only 'Connect wallet' with no 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'/api/v1/generate/resource/23':96 '/docs':182 '/pricing':184 '/readme':186 '/request':19,38 '0.02':18,37,121,170 '000':116 '20':115 '6':128 'Base network API' 'USDC API' 'accept':104 'access':102,223 'addit':147 'address':139 'advertis':146 'agent':234 'ai':12,31 'ai/ml':57 'analysi':151 'analyt':56 'api':5,24,45,83,101,222 'avail':212 'base':8,27,76,117 'behavior':247 'behind':219 'beyond':174 'broad':50 'call':4,23,124,251 'catalog':51 'chain':135 'challeng':109 'classif':154 'connect':192 'content':198 'convers':162 'cost':113,242 'crawl':215 'crypto-paid API' 'data':11,30,55,60,164 'decim':129 'descript':231 'document':173,207 'embed':155 'enabl':44 'endpoint':16,35,53,66,94,148,225,244 'exact':142,217 'exampl':211 'exchang':158 'experiment':243 'export':165 'extrem':179 'feed':157 'financ':13,32 'finance/web3':59 'function':218 'general':62 'generic':233 'geocod':160 'indic':110 'infer':58 'json-response' 'key':84 'land':176 'limit':87 'list':98 'low':241 'low-cost':240 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':112 'micropayment API' 'name':229 'network':77 'no-api-key' 'offer':10,29 'on-chain':133 'openapi':202 'page':177,187 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':130 'per':3,22,70,123 'per-request':69 'platform':6,25,46,145 'point':172 'post':105 'post-endpoint' 'premium':100,221 'price':156,171 'prompt':194 'protocol':81 'provid':48 'rate':86,159 'render':189 'request':71,106 'request/response':205 'requir':91 'resource/23':224 'schema':206 'scheme':143 'sentiment':150 'servic':64 'settl':132 'sinc':125 'span':54 'spars':180 'spec':203 'specif':93 'specifi':138 'subscript':90 'substant':197 'summar':153 'test':250 'text':152 'treat':236 'unclear':227 'unit':118 'usag':210 'usd':122 'usdc':9,28,73,120,126 'usdc-base-network' 'use':72,127,140 'util':15,34,63 'valid':161 'verifi':246 'via':78 'wallet':193 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bc2c56ba-8adc-4269-b9d1-05d356680e94","listingId":"3730a4e2-2ebf-4432-841e-7e01059e3730","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/generate/resource/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:04.087Z"}],"sources":[{"listingId":"3730a4e2-2ebf-4432-841e-7e01059e3730","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:04.087Z","lastSeenAt":"2026-04-23T13:30:31.708Z"}],"details":{"listingId":"3730a4e2-2ebf-4432-841e-7e01059e3730","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/23","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-header>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/23"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/23"}],"useCases":["Accessing utility or generation endpoints without API key registration","Making low-cost per-request API calls settled in USDC on Base","Programmatic agents purchasing API access via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented, production-grade APIs with SLAs","Anyone without a Base-compatible USDC wallet","Use cases requiring guaranteed uptime or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.051Z"},"updatedAt":"2026-04-23T13:30:31.708Z"}}