{"id":"5d3ec2ff-5979-4c8b-b119-f31428547bc6","shortId":"7ejSJ6","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/83` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It accepts POST requests and returns application/json.\n\nPayment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request. The platform advertises identical $0.02 pricing across all its endpoints.\n\nThe broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail. Without OpenAPI specs, request/response schemas, or usage examples, the actual behavior of this specific resource remains unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-api","post-method"],"categories":["infrastructure","api-gateway"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/generate/resource/83 ('Premium API Access') is undocumented; its input parameters and output format are unknown.","No OpenAPI spec, no request schema, and no response schema are provided.","The platform lists many endpoint categories (AI, finance, analytics) but none have visible documentation, raising questions about actual implementation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/83","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/83","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 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of 'resource/83' is entirely opaque. This is effectively a stub 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'0.02':10,28,121,154 '000':116 '0x8335':106 '20':115 '2913':107 '6':126 'Base network API' 'USDC micropayment API' 'accept':94 'access':6,24,82 'across':53,156 'actual':208 'advertis':152 'ai/ml':56 'analysi':167 'analyt':55 'api':5,16,23,34,52,81,131 'application/json':99 'attach':142 'base':8,26,71,109,117 'base-network' 'behavior':209 'beyond':90 'broader':45,161 'caller':140 'classif':170 'commit':139 'connect':191 'contract':105 'convers':178 'cost':113 'crypto-paid API' 'data':54,180 'decim':127 'detail':198 'doc':185 'document':89,183 'embed':171 'endpoint':38,159,164 'equal':120 'exact':85 'exampl':206 'exchang':174 'feed':173 'finance/web3':58 'function':86 'gate':3,21,63 'generat':181 'geocod':176 'header':146 'howev':182 'ident':153 'infer':57 'infrastructur':60 'json-api' 'key':17,35,132 'label':92 'limit':135 'list':78,163 'lowpaymentfee' 'lowpaymentfee.com':40 'maximum':112 'minimum':138 'network':72 'offer':47 'openapi':200 'page':184 'part':42 'pay':9,27,49 'pay-per-call API' 'pay-per-request':48 'payment':67,100,145 'per':11,29,50,122 'per-request-billing' 'platform':46,151,162 'post':95 'post-method' 'premium':4,22,80 'premium API access' 'price':155,172,186 'prompt':193 'protocol':68 'rate':134,175 'readm':187 'remain':214 'request':12,30,51,96,123,149 'request/response':202 'requir':18,36 'resourc':75,213 'return':98,188 'schema':203 'sentiment':166 'settl':102 'simpli':141 'spec':201 'specif':74,212 'summar':169 'technic':197 'text':168 'unclear':215 'unit':118 'usag':205 'usdc':14,32,104,124 'usdc-settlement' 'use':125 'util':61 'valid':177 'via':64 'wallet':192 'without':199 'x402':2,20,66,144 'x402 endpoint' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"f52e81f1-4ab3-4fa6-966a-ef1be81aa9e7","listingId":"5d3ec2ff-5979-4c8b-b119-f31428547bc6","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:06.437Z"}],"sources":[{"listingId":"5d3ec2ff-5979-4c8b-b119-f31428547bc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:06.437Z","lastSeenAt":"2026-04-24T11:31:41.185Z"}],"details":{"listingId":"5d3ec2ff-5979-4c8b-b119-f31428547bc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/83 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/83"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/83"},{"claim":"Documentation pages (docs, pricing, README) returned only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","AI agents with Base USDC wallets needing on-demand API calls","Low-commitment, no-signup API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.817Z"},"updatedAt":"2026-04-24T11:31:41.185Z"}}