{"id":"df66bd78-e04e-4250-ae54-0619d96eb6c1","shortId":"C6zSs3","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform offering a suite of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys or accounts are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/17` 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 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/request price point. Documentation pages exist but appear to require a wallet connection and contain no visible content in the crawl. As a result, request/response schemas for individual endpoints are not documented in the available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","json-response","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) are wallet-gated and contain no visible content","No OpenAPI or machine-readable schema available","The endpoint path '/api/v1/charges/17' does not clearly map to any of the advertised functional APIs listed on the homepage","Request and response body formats are completely undocumented","The exact functionality behind 'Premium API Access' is ambiguous — it may be a generic payment endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/17","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/17","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, and the landing page lists available APIs with pricing. However, there is no OpenAPI spec, no request/response schema documentation, and the docs/pricing/README pages are all blank (wallet-gated). The specific purpose of '/api/v1/charges/17' beyond 'Premium API Access' is unclear — it may be a generic charge endpoint rather than a specific functional 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'/request':182 '0.02':10,29,71,128,181 '000':117 '0x8335':122 '20':116 '2913':123 '300':141 '402':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':146 'access':6,25,107 'account':84 'across':52 'advertis':155 'ai':55 'analysi':159 'analyt':54 'api':5,24,45,81,106 'appear':189 'application/json':151 'attach':89 'avail':216 'base':8,27,78,118,125 'base-network' 'broader':153 'caller':87 'challeng':112 'classif':162 'connect':194 'contain':196 'content':199 'convers':174 'crawl':202 'crypto-paid API' 'data':53 'decim':133 'document':185,213 'embed':163 'enabl':44 'endpoint':51,64,99,145,156,210 'equal':127 'estim':171 'exact':138 'exchang':166 'exist':187 'feed':165 'financ':58 'gas':170 'gate':3,22 'generat':176 'geocod':172 'given':129 'header':93 'http-post' 'individu':209 'infrastructur':61 'json-response' 'key':16,35,82 'learn':57 'limit':19,38 'list':103 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':56 'materi':217 'network':79 'no-api-key' 'offer':47 'page':186 'pay':9,28,67 'pay-per-call API' 'pay-per-request':66 'payment':92,135 'per':11,30,68 'platform':46,154 'point':184 'post':147 'premium':4,23,105 'premium API access' 'price':164,183 'quot':169 'rate':18,37,167 'request':12,31,69,96,113,148 'request/response':206 'requir':86,191 'result':205 'return':109,150 'schema':207 'scheme':136 'second':142 'sentiment':158 'settl':73 'simpli':88 'specif':98 'suit':49 'summar':161 'text':160 'timeout':143 'token':168 'unit':119 'usdc':14,33,75,121,130 'usdc-settlement' 'util':62 'valid':173 'visibl':198 'wallet':193 'web3':59 'x402':2,21,43,91 'x402 API' 'x402-enabled':42 'x402-gated':1,20 'x402-payment'","prices":[{"id":"d37c8542-4267-4922-aa55-6e78403c99e0","listingId":"df66bd78-e04e-4250-ae54-0619d96eb6c1","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:26.677Z"}],"sources":[{"listingId":"df66bd78-e04e-4250-ae54-0619d96eb6c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:26.677Z","lastSeenAt":"2026-04-24T04:03:33.170Z"}],"details":{"listingId":"df66bd78-e04e-4250-ae54-0619d96eb6c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/17 \\\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, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/17"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying per-call for miscellaneous utility endpoints (geocoding, validation, conversion)","Accessing AI inference (sentiment, summarization, classification, embeddings) with crypto micropayments","Fetching financial data (prices, exchange rates, gas estimates) via x402 payment"],"bestFor":["AI agents with x402 payment capability on Base","Developers who want zero-signup, pay-as-you-go API access","Applications needing low-cost ($0.02) per-request utility or AI endpoints"],"notFor":["Users without USDC on Base network","High-volume batch workloads where per-request pricing may add up","Anyone needing detailed API documentation before integrating (docs are sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.352Z"},"updatedAt":"2026-04-24T04:03:33.170Z"}}