{"id":"6ccca733-b258-49bd-8337-743a70e9a739","shortId":"CrC9AH","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/ML inference, finance/Web3, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/199` 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 platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint accepts POST requests and returns application/json, but the actual input parameters and output format are unknown. The broader platform lists sibling endpoints for sentiment analysis, text summarization, geocoding, price feeds, and more, but none have documented schemas either. Treat this as a stub listing until better documentation surfaces.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API access","x402 API","lowpaymentfee","micropayment API","pay-per-call API","USDC API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content","No OpenAPI spec or request/response schema provided","The exact functionality of /api/v1/generate/resource/199 is unknown; 'Premium API Access' is not descriptive","The broader platform lists many endpoints but none appear to have documented behavior or schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/199","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/199","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), but there is zero documentation on what the endpoint actually does, no request/response schema, no examples, and the 'Premium API Access' label is entirely generic. This is effectively a 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'/api/v1/generate/resource/199':69 '/docs':167 '/pricing':168 '/readme':171 '/request':17,34 '0.02':16,33,99,132 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':116 '20':123 '6':129 'USDC API' 'accept':198 'access':75,147 'actual':206 'advertis':119,138 'ai/ml':59 'analysi':222 'analyt':58 'api':5,22,55,74,140 'application/json':203 'attach':150 'base':8,25,111,125 'base-network' 'better':243 'beyond':83 'broader':215 'call':12,29,135 'caller':148 'challeng':118 'collect':46 'connect':177 'content':183 'contract':115 'data':57 'decim':130 'document':82,162,233,244 'either':235 'endpoint':6,23,36,91,197,219 'equal':131 'exact':78 'exampl':195 'extrem':164 'feed':227 'finance/web3':61 'format':211 'function':79 'gate':3,20 'geocod':225 'handl':104 'header':155 'infer':60 'infrastructur':63 'input':207 'instant':146 'json-api' 'key':141 'label':85 'limit':144 'list':71,217,241 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':90 'maxamountrequir':121 'micropayment API' 'network':112 'none':231 'offer':44 'one':88 'openapi':187 'output':210 'page':172 'paid API access' 'paramet':208 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':102,154,160 'per':11,28,53,100,134 'platform':42,94,137,216 'post':199 'post-method' 'premium':4,21,73 'premium API' 'price':96,226 'prompt':179 'proof':161 'protocol':50,108 'rate':143 'render':174 'request':54,101,200 'request/response':190 'resourc':67 'return':202 'schema':191,234 'sentiment':221 'sibl':218 'simpli':149 'span':56 'spars':165 'spec':188 'specif':66 'stub':240 'summar':224 'surfac':245 'text':223 'treat':236 'uniform':97 'unit':126 'unknown':213 'usag':194 'usd':133 'usdc':14,31,114 'usdc-settlement' 'use':113 'util':64 'valid':158 'via':105 'wallet':178 'x':153 'x-payment':152 'x402':2,19,49,107,159 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"060b9cd9-1121-4e03-a403-2cb2b965d03d","listingId":"6ccca733-b258-49bd-8337-743a70e9a739","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:47.513Z"}],"sources":[{"listingId":"6ccca733-b258-49bd-8337-743a70e9a739","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:47.513Z","lastSeenAt":"2026-04-22T23:00:59.207Z"}],"details":{"listingId":"6ccca733-b258-49bd-8337-743a70e9a739","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/199 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/199"},{"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/199"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a gated API resource with per-call USDC micropayments on Base","Demonstrating x402 protocol payment flows for agent-to-agent commerce","Integrating pay-as-you-go API calls without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-request API access on Base","Projects wanting sub-cent or low-cost per-call pricing"],"notFor":["Users who need well-documented API schemas and examples before integrating","High-throughput production workloads requiring SLA guarantees","Anyone who cannot pay with USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.769Z"},"updatedAt":"2026-04-22T23:00:59.207Z"}}