{"id":"25eaa1e8-1d09-4b35-a852-aa46fa949b64","shortId":"hxqry4","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is a multi-category API platform that sells access to various endpoints through the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/6` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader platform offers endpoints spanning four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced identically at $0.02 per call with no API keys, no rate limits, and no minimum commitments required.\n\nThis particular endpoint (`/api/v1/payments/6`) does not have a clear description of what data or service it returns beyond the generic \"Premium API Access\" label. It is not listed among the named endpoints on the landing page, so its specific functionality is unknown. The endpoint is live and returns a valid x402 challenge via POST. Documentation pages (/docs, /pricing, /api, /README) all rendered only a \"Connect wallet\" prompt with no additional technical content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","premium api"],"warnings":["The specific functionality of /api/v1/payments/6 is undocumented — it is not listed among the named endpoints on the landing page","All documentation pages (/docs, /pricing, /api, /README) contain no usable content beyond a 'Connect wallet' prompt","No OpenAPI spec, request schema, or response schema is available","No example of a successful (paid) response is available to verify what the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/6","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/6","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 challenge, but there is no documentation, no OpenAPI schema, no examples of successful responses, and the specific functionality behind 'Premium API Access' at /api/v1/payments/6 is entirely unknown. All doc pages render only 'Connect wallet' with no 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'/api/v1/payments/6':60,169 '/docs':222 '/pricing':223 '/readme':225 '/request':99 '0.02':12,28,89,98,151 '000':80 '20':79 '6':85 'accept':67 'access':7,23,43,65,188 'across':101 'addit':235 'advertis':75 'ai':119 'among':194 'analysi':123 'analyt':113 'api':6,22,39,64,156,187 'base':9,25,54,71,81 'base network api' 'beyond':183 'broader':105 'call':4,20,153 'categori':38,111 'challeng':74,217 'classif':126 'clear':174 'commit':164 'connect':230 'consist':92 'content':237 'convers':143 'data':112,116,178 'decim':86 'descript':175 'document':220 'embed':127 'endpoint':46,58,103,108,146,168,197,209 'equal':88 'estim':137 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':205 'gas':136 'generat':144 'generic':185 'geocod':141 'ident':149 'infrastructur':139 'insight':118 'key':157 'label':62,189 'land':200 'learn':121 'limit':160 'list':193 'live':211 'low payment fee' 'lowpaymentfee.com':33 'machin':120 'maxamountrequir':77 'metric':114 'micropayment api' 'minimum':163 'multi':37 'multi-categori':36 'name':196 'network':55 'no-api-key' 'offer':107 'page':201,221 'particular':167 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':50,69 'per':3,13,19,29,90,152 'platform':40,106 'post':219 'post-method' 'premium':5,21,63,186 'premium api' 'price':100,130,148 'prompt':232 'protocol':51 'quot':135 'rate':133,159 'render':227 'report':115 'request':14,30,91 'requir':165 'return':182,213 'sell':42 'sentiment':122 'servic':180 'site':95 'span':109 'specif':57,204 'summar':125 'technic':236 'text':124 'token':134 'uniform':97 'unit':82 'unknown':207 'usdc':16,32,68,84 'usdc api access' 'usdc-base' 'util':140 'valid':142,215 'various':45 'via':10,26,218 'wallet':231 'web3':129 'x402':11,27,49,73,216 'x402 api' 'x402-payment'","prices":[{"id":"9fb0093c-f381-4f9d-ba5b-91c1a268ebf0","listingId":"25eaa1e8-1d09-4b35-a852-aa46fa949b64","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:56.882Z"}],"sources":[{"listingId":"25eaa1e8-1d09-4b35-a852-aa46fa949b64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:56.882Z","lastSeenAt":"2026-04-22T05:31:19.495Z"}],"details":{"listingId":"25eaa1e8-1d09-4b35-a852-aa46fa949b64","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without payment, it returns 402 with the payment challenge.\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/6\n# Returns 402 with x402 challenge specifying USDC on Base, $0.02 per call","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/6","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC base units ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/6"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/6"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents needing keyless, on-demand API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.551Z"},"updatedAt":"2026-04-22T05:31:19.495Z"}}