{"id":"ec4d981e-d21a-44ab-b73b-3960501512c9","shortId":"22jHRg","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/81` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, geocoding, validation, conversion, price feeds, exchange rates, token quotes, gas estimates, and more — all at the same $0.02 price point. However, documentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available for any endpoint including this one.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key"],"categories":["infrastructure","general"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC micropayment API","Base network API","pay-per-call API","resource generation"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema specification for request or response payloads","The exact functionality of /api/v1/generate/resource/81 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual functionality behind 'Premium API Access' is completely opaque. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/generate/resource/81':71 '/docs':206 '/pricing':208 '/readme':210 '/request':17,34 '0.02':16,33,101,134,197 '000':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '20':125 '6':131 'Base network API' 'USDC micropayment API' 'accept':140 'access':77 'addit':171 'advertis':121,170 'ai':59 'analysi':175 'analyt':58 'api':5,22,55,76,147 'application/json':145 'attach':156 'avail':237 'base':8,25,113,127 'beyond':85 'call':12,29,137 'caller':154 'challeng':120 'classif':178 'collect':46 'connect':216 'contract':117 'convers':182 'data':57 'decim':132 'detail':223 'document':84,201,232 'embed':179 'endpoint':6,23,36,93,139,172,240 'equal':133 'estim':190 'exact':80 'exampl':235 'exchang':185 'extrem':203 'feed':184 'financ':62 'function':81 'gas':189 'gate':3,20 'geocod':180 'handl':106 'header':161 'howev':200 'includ':241 'infrastructur':65 'json-api' 'key':148 'label':87 'learn':61 'limit':151 'list':73 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':60 'mani':92 'maxamountrequir':123 'network':114 'no-api-key' 'offer':44 'one':90,243 'openapi':227 'page':211 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payload':236 'payment':104,160,166 'per':11,28,53,102,136 'platform':42,96,169 'point':199 'post':141 'post-method' 'premium':4,21,75 'premium API' 'price':98,183,198 'prompt':218 'proof':167 'protocol':50,110 'quot':188 'rate':150,186 'render':213 'request':54,103,142 'request/response':230 'requir':153 'resourc':69 'resource generation' 'return':144 'schema':231 'sentiment':174 'simpli':155 'span':56 'spars':204 'spec':228 'specif':68 'summar':177 'technic':222 'text':176 'token':187 'uniform':99 'unit':128 'usd':135 'usdc':14,31,116 'usdc-base' 'use':115 'util':66 'valid':164,181 'via':107 'wallet':217 'web3':63 'x':159 'x-payment':158 'x402':2,19,49,109,165 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"37371186-bc67-4ddb-839b-9e17a395b307","listingId":"ec4d981e-d21a-44ab-b73b-3960501512c9","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:22.812Z"}],"sources":[{"listingId":"ec4d981e-d21a-44ab-b73b-3960501512c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:22.812Z","lastSeenAt":"2026-04-22T13:30:33.692Z"}],"details":{"listingId":"ec4d981e-d21a-44ab-b73b-3960501512c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/81"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/81"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making programmatic requests settled instantly via USDC on Base","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone requiring non-crypto payment methods","Production workloads that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.047Z"},"updatedAt":"2026-04-22T13:30:33.692Z"}}