{"id":"baee7d2e-5428-4750-8ab3-06e59f40c0cd","shortId":"cc8HRp","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/generate/resource/15` is labeled \"Premium API Access\" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — each request is settled on-chain.\n\nThe broader platform advertises endpoints across 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. The x402 challenge for this specific resource shows a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02.\n\nDocumentation 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 usage examples available from the crawled content. The endpoint is live and returns a valid x402 challenge, but without documentation it is unclear what input the POST body expects or what the response payload looks like.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","pay-per-use"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","on-chain API billing"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request body and response format are unknown.","The specific function of /api/v1/generate/resource/15 ('Premium API Access') is not described anywhere.","Platform appears to be a generic x402 demo or placeholder — all endpoints share the same $0.02 price and minimal descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/15","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/15","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 exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific resource (/resource/15) is entirely 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'/api/v1/generate/resource/15':57 '/docs':165 '/pricing':167 '/readme':169 '/request':13,28 '0.02':12,27,136,159 '20000':150 '6':155 'Base network API' 'USDC micropayment API' 'accept':64 'access':7,22,62 'across':96 'advertis':94 'ai':106 'analysi':110 'analyt':100 'api':6,21,40,61,75 'avail':196 'base':9,24,49,151 'base-network' 'bodi':221 'broader':92 'call':4,19,72 'categori':98 'chain':90 'challeng':141,210 'classif':113 'commit':83 'connect':175 'content':200 'convers':129 'crawl':199 'crypto-paid API' 'data':99,103 'decim':156 'detail':182 'document':160,191,213 'embed':114 'endpoint':41,55,95,132,202 'equal':158 'estim':124 'exampl':195 'exchang':119 'expect':222 'export':104 'extrem':162 'feed':118 'financ':115 'four':97 'gas':123 'generat':130 'geocod':127 'infrastructur':126 'input':218 'insight':105 'key':76 'label':59 'learn':108 'like':229 'limit':79 'list':134 'live':204 'look':228 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':107 'made':69 'maxamountrequir':148 'metric':101 'network':50 'no-api-key' 'offer':32 'on-chain':88 'on-chain API billing' 'openapi':186 'page':170 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'pay-per-use' 'payload':227 'payment':67 'per':3,18,38,71,137 'per-cal':70 'per-request-billing' 'platform':93 'post':65,220 'post-endpoint' 'premium':5,20,60 'price':117 'prompt':177 'protocol':46 'quot':122 'rate':78,120 'render':172 'report':102 'request':39,66,85,138 'request/response':189 'resourc':145 'respons':226 'return':206 'schema':190 'sentiment':109 'settl':42,87 'show':146 'spars':163 'spec':187 'specif':54,144 'suit':34 'summar':112 'technic':181 'text':111 'token':121 'unclear':216 'unit':152 'upfront':82 'usag':194 'usdc':15,30,52,154 'usdc-settlement' 'use':51 'valid':128,208 'via':10,25,43 'wallet':176 'web3':116 'without':212 'x402':11,26,45,140,209 'x402 API' 'x402-payment'","prices":[{"id":"573f055d-157d-4223-a9c8-4a7b8440b181","listingId":"baee7d2e-5428-4750-8ab3-06e59f40c0cd","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:06.523Z"}],"sources":[{"listingId":"baee7d2e-5428-4750-8ab3-06e59f40c0cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:06.523Z","lastSeenAt":"2026-04-24T11:31:44.017Z"}],"details":{"listingId":"baee7d2e-5428-4750-8ab3-06e59f40c0cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/15"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/15"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic pay-as-you-go data or utility requests without subscriptions"],"bestFor":["Developers or agents wanting zero-commitment, per-request API billing","x402-compatible clients on the Base network","Use cases where avoiding API key management is desirable"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-throughput use cases where on-chain settlement per request adds unacceptable latency","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.849Z"},"updatedAt":"2026-04-24T11:31:44.017Z"}}