{"id":"8b0d53f4-3405-41df-84b9-68b42336ca34","shortId":"PCs3Xr","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 that offers a variety of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated behind the x402 payment protocol on the Base network, accepting USDC (USD Coin) at $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/charges/104` 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 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, 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/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of individual endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","data","ai"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of /api/v1/charges/104 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","Response schema and actual data returned are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/104","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/charges/104 is not described, making this effectively a stub 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'/request':200 '0.02':10,28,80,141,199 '000':130 '0x8335':135 '20':129 '2913':136 '300':154 '402':124 '6':145 'Base network API' 'USDC micropayment API' 'accept':75,159 'access':6,24,107,120 'actual':221 'advertis':168 'ai':54 'analysi':177 'analyt':53 'api':5,17,23,35,43,84,119 'application/json':164 'attach':95 'base':8,26,73,131,138 'base-network' 'behavior':222 'behind':66 'broader':166 'caller':93 'categori':169 'challeng':125 'classif':180 'coin':78 'commit':90 'connect':212 'content':218 'convers':192 'crypto-paid API' 'data':52,173 'decim':146 'doc':206 'document':204 'embed':181 'enabl':42 'endpoint':50,63,109,112,158,228 'equal':140 'estim':189 'exact':151 'exchang':184 'export':174 'feed':183 'financ':57 'gas':188 'gate':3,21,65 'generat':194 'geocod':190 'given':142 'header':100 'howev':203 'includ':170 'individu':227 'infrastructur':60 'insight':175 'json-response' 'key':18,36,85 'learn':56 'limit':87 'list':116 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':55 'metric':171 'network':74 'no-api-key' 'offer':46 'page':205 'pay':9,27 'pay-per-call API' 'pay-per-request' 'payment':69,99,104,148 'per':11,29,81 'platform':44,167 'point':202 'post':160 'post-method' 'premium':4,22,118 'premium API access' 'price':182,201,207 'prompt':214 'proof':105 'protocol':70 'quot':187 'rate':86,185 'readm':208 'remain':229 'report':172 'request':12,30,82,126,161 'requir':92 'respons':224 'return':122,163,209 'schema':225 'scheme':149 'second':155 'sentiment':176 'simpli':94 'span':51 'specif':111 'substant':217 'summar':179 'text':178 'timeout':156 'token':186 'undocu':230 'unit':132 'upfront':89 'usd':77 'usdc':14,32,76,134,143 'usdc-payment' 'util':61 'valid':103,191 'varieti':48 'wallet':213 'web3':58 'x':98 'x-payment':97 'x402':2,20,41,68 'x402 API' 'x402-enabled':40 'x402-gated':1,19 'x402-payment'","prices":[{"id":"b8efec14-64e7-4958-8f6c-860d90272759","listingId":"8b0d53f4-3405-41df-84b9-68b42336ca34","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:10.397Z"}],"sources":[{"listingId":"8b0d53f4-3405-41df-84b9-68b42336ca34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:10.397Z","lastSeenAt":"2026-04-22T18:31:25.859Z"}],"details":{"listingId":"8b0d53f4-3405-41df-84b9-68b42336ca34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/104 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/104"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/104"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and metrics without managing API keys or subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request USDC payments","Fetching financial data like token quotes, exchange rates, and gas estimates via micropayments","Using utility services such as geocoding, validation, and conversion on a pay-as-you-go basis"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Users who prefer pay-per-request pricing with no minimum commitments"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.169Z"},"updatedAt":"2026-04-22T18:31:25.859Z"}}