{"id":"25b5bab0-be08-4593-8b44-4a5aa34d2749","shortId":"TMhJvJ","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-protocol-gated API resources offered by the provider. The specific resource `/api/v1/generate/resource/29` is listed as \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum charge of 20,000 units (which, given USDC's 6 decimals, equals $0.02 per request). The x402 challenge is live and conforms to x402 version 1 with the \"exact\" payment scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing, require no API keys, and claim no rate limits.\n\nHowever, the specific functionality behind `/api/v1/generate/resource/29` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually generates or accepts as input, callers must discover its behavior experimentally.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API","crypto-gated endpoint"],"warnings":["No documentation exists for /api/v1/generate/resource/29 — its actual functionality is unknown","All secondary pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content","No OpenAPI schema or request/response examples available","The endpoint name 'Premium API Access' is generic and non-descriptive","Cannot verify what 'generate/resource/29' actually generates"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is zero documentation on what this specific resource does, what inputs it expects, or what it returns. The docs/pricing/README pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':152 '0.02':90,151 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':74 '1':103 '20':80 '6':87 'Base network API' 'USDC API' 'accept':58,213 'access':56,178 'actual':210 'addit':203 'advertis':113 'ai':121 'analysi':125 'analyt':120 'api':5,19,41,55,117,156,177 'application/json':62 'base':8,22,69 'base-network' 'behavior':220 'behind':167 'beyond':172 'broader':110 'call':12,26 'caller':216 'challeng':95 'charg':78 'claim':159 'classif':127 'conform':99 'connect':198 'content':204 'contract':73 'convers':144 'crypto-gated endpoint' 'data':119 'decim':88 'discov':218 'doc':189 'document':171 'embed':128 'endpoint':6,20,30,147,209 'equal':89 'estim':138 'exact':106 'exampl':186 'exchang':133 'experiment':221 'feed':132 'financ':129 'function':166 'gas':137 'gate':3,17,40 'generat':145,211 'generic':174 'geocod':142 'given':84 'howev':163 'infrastructur':140 'input':215 'json-response' 'key':157 'know':206 'label':175 'learn':123 'limit':162 'list':52 'live':97 'lowpaymentfee' 'lowpaymentfee.com':32,111 'machin':122 'mani':36 'maximum':77 'micropayment API' 'must':217 'network':70 'no-api-key' 'offer':43 'one':34 'openapi':182 'page':193 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':64,107 'per':11,25,91 'platform':112 'post':59 'post-method' 'premium':4,18,54,176 'price':131,153,190 'prompt':200 'protocol':39 'provid':46 'quot':136 'rate':134,161 'readm':192 'render':195 'request':60,92 'request/response':185 'requir':154 'resourc':42,49 'respons':63 'return':61 'schema':183 'scheme':108 'sentiment':124 'settl':66 'share':148 'span':118 'specif':48,165 'suit':115 'summar':126 'token':135 'unit':82 'usdc':14,28,72,85 'usdc-payment' 'use':71 'util':141 'valid':143 'version':102 'wallet':199 'web3':130 'without':205 'x402':2,16,38,94,101 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':37","prices":[{"id":"33d4222c-85ce-4663-94bf-c8e7d825a31c","listingId":"25b5bab0-be08-4593-8b44-4a5aa34d2749","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:08.104Z"}],"sources":[{"listingId":"25b5bab0-be08-4593-8b44-4a5aa34d2749","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:08.104Z","lastSeenAt":"2026-04-24T15:01:52.241Z"}],"details":{"listingId":"25b5bab0-be08-4593-8b44-4a5aa34d2749","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/29","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with x402Version 1, exact scheme, on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/29"},{"claim":"maxAmountRequired is 20000 (USDC units, i.e. $0.02) and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/29"},{"claim":"The 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":"The provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium generation endpoint via x402 micropayment","Agent-driven API consumption without pre-registration or API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Projects already operating on the Base L2 with USDC"],"notFor":["Users who need well-documented, production-grade APIs with clear input/output contracts","Anyone without USDC on Base network","High-volume use cases where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.577Z"},"updatedAt":"2026-04-24T15:01:52.241Z"}}