{"id":"4666293c-fb9a-443f-bd6d-d0132b232983","shortId":"kSesKP","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-request 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/164` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It accepts POST requests and returns JSON.\n\nPayment is settled in USDC (contract `0x8335...2913` on Base) using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys, rate limits, or upfront commitments are advertised — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The platform's landing page lists roughly 16 endpoints spanning metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation, all at the same $0.02/request price point.\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 available from the crawl. The actual behavior behind resource ID 164 is unknown — it could be a generation utility or a placeholder. Agents should treat this as a low-cost experimental endpoint and verify output quality before relying on it in production workflows.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","post-method"],"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":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for resource/164","The exact purpose of 'Premium API Access' at resource/164 is unknown — the name is generic","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/164","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/164","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 description of what resource/164 actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/generate/resource/164':76 '/docs':198 '/pricing':199 '/readme':202 '/request':190 '0.02':10,28,133,189 '000':123 '0x8335':106 '16':165 '164':237 '20':122 '2913':107 '6':128 'Base network API' 'USDC micropayment API' 'accept':94 'access':6,24,82 'across':53 'actual':232 'advertis':143 'agent':249 'ai/ml':56 'amount':117 'analysi':171 'analyt':55 'api':5,16,23,34,52,81,135 'attach':146 'avail':227 'base':8,26,71,109,124 'base-network' 'behavior':233 'behind':234 'beyond':90 'broader':45 'call':120 'caller':144 'classif':174 'commit':141 'connect':208 'content':214 'contract':105 'convers':182 'cost':257 'could':241 'crawl':230 'crypto-paid API' 'data':54 'decim':129 'document':89,193 'embed':175 'endpoint':38,166,259 'equal':132 'exact':85,113 'exampl':226 'exchang':178 'experiment':258 'extrem':195 'feed':177 'finance/web3':58 'function':86 'gate':3,21,63 'generat':184,244 'geocod':180 'header':151 'id':236 'infer':57 'infrastructur':60 'json':99 'json-api' 'key':17,35,136 'label':92 'land':161 'limit':138 'list':78,163 'low':256 'low-cost':255 'lowpaymentfee' 'lowpaymentfee.com':40 'maximum':116 'metric':168 'network':72 'no-api-key' 'offer':47 'openapi':218 'output':262 'page':162,203 'part':42 'pay':9,27,49 'pay-per-call API' 'pay-per-request':48 'payment':67,100,150,156 'per':11,29,50,119 'placehold':248 'platform':46,159 'point':192 'post':95 'post-method' 'premium':4,22,80 'premium API access' 'price':176,191 'product':269 'prompt':210 'proof':157 'protocol':68 'qualiti':263 'rate':137,179 'reli':265 'render':205 'report':169 'request':12,30,51,96 'request/response':221 'requir':18,36,118 'resourc':75,235 'return':98 'rough':164 'schema':222 'scheme':114 'sentiment':170 'settl':102 'simpli':145 'span':167 'spars':196 'spec':219 'specif':74 'summar':173 'text':172 'treat':251 'unit':125 'unknown':239 'upfront':140 'usag':225 'usdc':14,32,104,131 'usdc-settlement' 'use':110 'util':61,245 'valid':154,181 'verifi':261 'via':64 'wallet':209 'workflow':270 'x':149 'x-payment':148 'x402':2,20,66,112,155 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"66f2089f-5c5c-4242-932a-366f8237d0a4","listingId":"4666293c-fb9a-443f-bd6d-d0132b232983","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:58.317Z"}],"sources":[{"listingId":"4666293c-fb9a-443f-bd6d-d0132b232983","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:58.317Z","lastSeenAt":"2026-04-24T11:31:43.652Z"}],"details":{"listingId":"4666293c-fb9a-443f-bd6d-d0132b232983","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/164 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/164"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/164"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists ~16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a generation or utility endpoint without needing API key registration","Agent-driven workflows that need low-cost, on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integrations with a cheap test endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-request API access on Base","Low-cost prototyping of crypto-settled API consumption"],"notFor":["Production workloads requiring documented, well-specified API contracts","Users who need fiat-only payment options","High-throughput use cases where per-request crypto settlement adds unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.205Z"},"updatedAt":"2026-04-24T11:31:43.652Z"}}