{"id":"0896d873-ae96-4e35-a41c-66b240ff1e6b","shortId":"NwUGaa","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request. Payment is settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/309` 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\nNote that the crawled documentation pages (docs, api, pricing, README) all rendered only a \"Connect wallet\" prompt with no further content, so there is no detailed API documentation, request/response schemas, or usage examples available. The exact functionality behind this particular endpoint path (`/payments/309`) is unclear — it may be a generic premium access gate or a specific resource. The site's landing page lists many other endpoints across categories like sentiment analysis, text summarization, geocoding, and crypto gas estimates, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","crypto payment api"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","The specific functionality of /api/v1/payments/309 ('Premium API Access') is not described anywhere","No request or response schema provided","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/309","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/payments/309","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, confirming pricing and payment details. However, there is no API documentation, no request/response schema, and no examples available — the docs/pricing/README pages all render only a wallet connect prompt. The purpose of this specific endpoint path (/payments/309) is 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'/payments/309':188 '/request':13,28 '0.02':12,27,69,122,228 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'accept':140 'access':7,22,38,101,197 'across':212 'ai':58 'analysi':216 'analyt':57 'api':6,21,37,54,83,100,153,172 'application/json':145 'avail':179 'base':9,24,79,112,119 'base network api' 'behind':183 'call':4,19 'categori':213 'challeng':106 'collect':48 'commit':90 'connect':160 'content':166 'crawl':149 'crypto':221 'crypto payment api' 'data':56 'decim':127 'detail':171 'doc':152 'document':150,173 'endpoint':32,94,139,186,211 'equal':121 'estim':223 'exact':132,181 'exampl':178 'financ':61 'function':182 'gas':222 'gate':198 'generic':195 'geocod':219 'given':123 'host':46 'infrastructur':64 'json-api' 'key':84 'land':206 'learn':60 'like':214 'limit':87 'list':97,208 'low payment fee' 'lowpaymentfee.com':34 'machin':59 'mani':209 'may':192 'micropayment api' 'network':80 'no-api-key' 'no-rate-limit' 'note':146 'page':151,207 'particular':185 'path':187 'pay':2,17,51 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':50 'payment':42,72,129 'per':3,18,52,70 'point':230 'post':141 'premium':5,20,36,99,196 'price':67,154,229 'prompt':162 'protocol':43 'provid':35 'rate':86 'readm':155 'render':157 'request':53,71,107,142 'request/response':174 'requir':91 'resourc':202 'return':103,144 'schema':175 'scheme':130 'second':136 'sentiment':215 'settl':74 'site':45,204 'span':55 'specif':93,201 'summar':218 'text':217 'timeout':137 'unclear':190 'unit':113 'usag':177 'usdc':15,30,76,115,124 'usdc api access' 'usdc-base' 'util':65 'via':10,25,39 'wallet':161 'web3':62 'x402':11,26,41 'x402 api' 'x402-payment'","prices":[{"id":"2a816342-e339-4360-83e6-bc3bc053b89b","listingId":"0896d873-ae96-4e35-a41c-66b240ff1e6b","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/payments/309","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:16.227Z"}],"sources":[{"listingId":"0896d873-ae96-4e35-a41c-66b240ff1e6b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/309","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:16.227Z","lastSeenAt":"2026-04-23T12:31:28.144Z"}],"details":{"listingId":"0896d873-ae96-4e35-a41c-66b240ff1e6b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/309 \\\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 requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/payments/309"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access to paid endpoints without subscription commitments"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over API key management"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-call pricing may add up quickly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.627Z"},"updatedAt":"2026-04-23T12:31:28.144Z"}}