{"id":"f0a3c2e3-3b4d-467d-a7f6-c987ad781bc7","shortId":"A2UGTm","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":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/124` is labeled \"Premium API Access\" and requires a USDC payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a Base address, with no API keys, rate limits, or upfront commitments required.\n\nThe broader platform advertises endpoints across 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 listed at $0.02 per request. However, the specific functionality behind the `/api/v1/payments/124` path is not documented beyond the generic \"Premium API Access\" label, so it is unclear what data or service this particular endpoint returns.\n\nThe endpoint is live and returns a valid x402 402 challenge. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content","The specific functionality of /api/v1/payments/124 is undocumented; 'Premium API Access' is a generic label","No OpenAPI spec or request/response schema provided","No examples of successful (paid) responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/124","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/124","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns upon successful payment, no OpenAPI spec, no request/response examples, and the docs pages are empty. The specific function of /api/v1/payments/124 is unknown beyond the generic 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'/request':13,28 '0.02':12,27,69,147 '000':73 '20':72 '402':189 '6':79 'Base network API' 'USDC micropayment API' 'access':7,22,41,60,166 'across':106 'address':90 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':6,21,40,59,93,165,200 'avail':230 'base':9,24,49,74,89 'base-network' 'behind':154 'beyond':161 'broader':102 'call':4,19,71 'categori':108 'chain':86 'challeng':190 'classif':123 'commit':99 'connect':209 'convers':140 'crawl':233 'data':109,113,173 'decim':80 'detail':216 'doc':199 'document':160,191,225 'embed':124 'endpoint':53,105,143,178,181 'estim':134 'exampl':229 'exchang':129 'export':114 'extrem':196 'feed':128 'financ':125 'four':107 'function':153 'gas':133 'generat':141 'generic':163 'geocod':138 'howev':150 'infrastructur':136 'insight':115 'key':94 'label':57,167 'learn':118 'limit':96 'list':145 'live':183 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'network':50 'no-api-key' 'no-rate-limit' 'offer':32 'on-chain':84 'openapi':220 'page':204,234 'particular':177 'path':157 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':45,65,81 'per':3,18,38,70,148 'platform':103 'premium':5,20,58,164 'premium API access' 'price':127,201 'prompt':211 'protocol':46 'quot':132 'rate':95,130 'readm':203 'render':206 'report':112 'request':39,149 'request/response':223 'requir':62,100 'return':179,185 'schema':224 'sentiment':119 'servic':175 'settl':83 'site':194 'spec':221 'specif':52,152 'suit':34 'summar':122 'technic':215 'text':121 'thin':197 'token':131 'unclear':171 'unit':75 'upfront':98 'usag':228 'usdc':15,30,64,77 'usdc-settlement' 'util':137 'valid':139,187 'via':10,25,42 'wallet':210 'web3':126 'x402':11,26,44,188 'x402 API' 'x402-payment'","prices":[{"id":"cf7fce58-29dd-406b-8e7c-1d36b670f4d6","listingId":"f0a3c2e3-3b4d-467d-a7f6-c987ad781bc7","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/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:26.929Z"}],"sources":[{"listingId":"f0a3c2e3-3b4d-467d-a7f6-c987ad781bc7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:26.929Z","lastSeenAt":"2026-04-23T17:31:47.365Z"}],"details":{"listingId":"f0a3c2e3-3b4d-467d-a7f6-c987ad781bc7","quickStartSnippet":"# The endpoint returns HTTP 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/124 \\\n  -H 'Content-Type: application/json'\n# Response: 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment on Base.","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/124","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 valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/124"},{"claim":"All endpoints are listed 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"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/124"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","On-chain pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage at $0.02/request"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.867Z"},"updatedAt":"2026-04-23T17:31:47.365Z"}}