{"id":"cf00bc19-b68f-46e6-bdb7-95661d45cd68","shortId":"tacgZZ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated via the x402 payment protocol on the Base network. The specific resource `/api/v1/generate/resource/166` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.\n\nPayment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base using the x402 \"exact\" scheme. The probe confirms the endpoint is live, returning a proper 402 challenge with `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts HTTP POST requests and returns `application/json` responses. A 300-second payment timeout is allowed.\n\nThe platform hosts numerous other endpoints covering sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — 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 examples available. The actual behavior of this specific resource (166) is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of resource/166 ('Premium API Access') is completely undocumented — its purpose is unknown.","No OpenAPI spec, request schema, or response schema is available anywhere on the site.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no technical content.","Cannot verify what data or service is returned after payment without actually paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/166","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 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 indication of what 'Premium API Access' resource 166 actually does. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'0.02':10,28,98,147,195 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '166':242 '20000':142 '300':163 '402':137 '6':150 'Base network API' 'USDC micropayment API' 'accept':154 'access':6,24,82,112 'across':53 'actual':236 'advertis':95 'ai/ml':56 'allow':168 'analysi':177 'analyt':55 'api':5,16,23,34,52,81,105,205 'application/json':160 'avail':234 'base':8,26,71,121,143 'base-network' 'behavior':237 'beyond':90 'broader':45 'call':51 'challeng':138 'classif':180 'confirm':129 'connect':214 'contract':118 'convers':188 'cover':175 'crypto-paid API' 'data':54 'decim':151 'detail':221 'doc':204 'document':89,199,230 'embed':181 'endpoint':38,131,153,174 'equal':146 'exact':85,125 'exampl':233 'exchang':184 'extrem':201 'feed':183 'finance/web3':58 'flat':97 'function':86 'gate':3,21,63 'generat':190 'geocod':186 'host':171 'howev':198 'http':155 'http-post' 'infer':57 'infrastructur':60 'instant':111 'json-response' 'key':17,35,106 'label':92 'limit':109 'list':78 'live':133 'lowpaymentfee' 'lowpaymentfee.com':40 'maxamountrequir':140 'model':102 'network':72 'no-api-key' 'numer':172 'offer':47 'openapi':225 'page':209 'part':42 'pay':9,27,49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':67,113,165 'per':11,29,50,99 'platform':46,94,170 'point':197 'post':156 'premium':4,22,80 'premium API access' 'price':101,182,196,206 'probe':128 'prompt':216 'proper':136 'protocol':68 'rate':108,185 'readm':208 'render':211 'request':12,30,100,157 'request/response':228 'requir':18,36 'resourc':75,241 'respons':161 'return':134,159 'schema':229 'scheme':126 'second':164 'sentiment':176 'settl':115 'spars':202 'spec':226 'specif':74,240 'summar':179 'technic':220 'text':178 'timeout':166 'unit':144 'unknown':244 'usdc':14,32,117,148 'usdc-settlement' 'use':122,149 'util':61 'valid':187 'via':64 'wallet':215 'x402':2,20,66,124 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"61655491-b3d6-4543-9fec-16b58708e065","listingId":"cf00bc19-b68f-46e6-bdb7-95661d45cd68","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:50.001Z"}],"sources":[{"listingId":"cf00bc19-b68f-46e6-bdb7-95661d45cd68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:50.001Z","lastSeenAt":"2026-04-24T10:32:12.276Z"}],"details":{"listingId":"cf00bc19-b68f-46e6-bdb7-95661d45cd68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/166 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/166"},{"claim":"Platform advertises $0.02 per request pricing 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/166"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic consumption of paid endpoints without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where per-request pricing may be less economical than bulk plans","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.828Z"},"updatedAt":"2026-04-24T10:32:12.276Z"}}