{"id":"7e376024-d7f7-4a90-ab60-c787436ddfd2","shortId":"tj8xM7","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com is an x402-enabled API platform offering a suite of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/127` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The challenge uses the \"exact\" payment scheme with a 300-second timeout. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 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 schema, no request/response examples, and no description of what the `/api/v1/charges/127` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to determine the actual functionality behind this specific route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","text-summarization","sentiment-analysis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific functionality of /api/v1/charges/127 ('Premium API Access') is undefined — it is unclear what data or service it provides","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/127","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/charges/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/charges/127 actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/charges/127':101,210 '/docs':179 '/pricing':180 '/readme':183 '0.02':10,28,68,128,171 '000':117 '0x8335':122 '20':116 '2913':123 '300':138 '402':111,219 'Base network API' 'USDC API' 'access':6,24,107 'across':50 'actual':212,233 'addit':145 'advertis':144 'ai-inference' 'ai/ml':53 'analysi':149 'analyt':52 'api':5,17,23,35,43,78,106 'attach':89 'base':8,26,75,118,125 'base-network' 'behind':235 'broader':142 'caller':87 'captur':221 'challeng':112,130,220 'classif':152 'commit':84 'confirm':217 'connect':189 'content':195 'convers':164 'crypto-data' 'crypto-paid API' 'data':51,56 'data-analytics' 'descript':206 'determin':231 'difficult':229 'document':174,226 'embed':153 'enabl':42 'endpoint':49,61,99,146,211,215 'equal':127 'estim':161 'exact':133 'exampl':203 'exchang':156 'extrem':176 'feed':155 'finance-data' 'finance/web3':55 'function':234 'gas':160 'gate':3,21 'generat':166 'geocod':162 'geocoding' 'header':93 'infer':54 'infrastructur':58 'key':18,36,79 'lack':224 'limit':81 'list':103 'live':218 'low payment fee' 'lowpaymentfee.com':37 'make':227 'micropayment API' 'network':76 'no-api-key' 'offer':45 'openapi':199 'page':184 'pay':9,27,64 'pay-per-call API' 'pay-per-request':63 'payment':92,134 'per':11,29,65 'platform':44,143 'point':173 'premium':4,22,105 'price':154,172 'prompt':191 'quot':159 'rate':80,157 'render':186 'request':12,30,66,96,113 'request/response':202 'requir':86 'return':109,213 'rout':238 'schema':200 'scheme':135 'second':139 'sentiment':148 'sentiment-analysis' 'settl':70 'simpli':88 'spars':177 'specif':98,237 'suit':47 'summar':151 'text':150 'text-summarization' 'timeout':140 'token':158 'unit':119 'upfront':83 'usdc':14,32,72,121 'usdc-settlement' 'use':131 'util':59 'valid':163 'wallet':190 'x402':2,20,41,91 'x402 API' 'x402-enabled':40 'x402-gated':1,19 'x402-payment'","prices":[{"id":"d1eb08e2-21a2-48fc-bdd6-6997a685eda4","listingId":"7e376024-d7f7-4a90-ab60-c787436ddfd2","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/charges/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:06.120Z"}],"sources":[{"listingId":"7e376024-d7f7-4a90-ab60-c787436ddfd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:06.120Z","lastSeenAt":"2026-04-23T11:03:19.317Z"}],"details":{"listingId":"7e376024-d7f7-4a90-ab60-c787436ddfd2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/127 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/127"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Pay-per-request AI inference (sentiment, summarization, classification, embeddings)","Fetching real-time crypto token quotes and gas estimates","Geocoding and data validation utilities with no rate limits"],"bestFor":["AI agents that need keyless, pay-as-you-go API access","Developers prototyping with low-cost per-call pricing on Base","Web3-native applications that can settle in USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.307Z"},"updatedAt":"2026-04-23T11:03:19.317Z"}}