{"id":"ac5d2161-fe2a-4eef-bb84-96cd07b34fa5","shortId":"gasLwY","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/301` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the `exact` scheme to the specified wallet address, with a 300-second timeout.\n\nThe broader platform advertises multiple API categories including 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. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, documentation is extremely sparse. 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 examples of what the endpoints actually return. The `/api/v1/payments/301` endpoint in particular has no description beyond its title, making it unclear what data or service it provides. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay per call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto API gateway"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose and expected input/output of /api/v1/payments/301 is undocumented","All documentation pages (docs, pricing, README, API) render only 'Connect wallet' with no content","Platform appears to be early-stage or demonstration; reliability and data quality are unknown","No request or response examples exist anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/301","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/301","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of the /api/v1/payments/301 endpoint is entirely undocumented. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,88,158 '000':78 '0x8335':83 '20':77 '300':109 '6':93 'Base network API' 'USDC API access' 'accept':46,64 'access':62,172 'actual':213 'address':106 'advertis':115 'ai':127 'analysi':131 'analyt':121 'api':5,20,38,61,117,165,180,251 'appear':237 'base':8,23,51,79,85 'beyond':223 'broader':113 'call':4,19,90 'categori':118 'challeng':69 'classif':134 'confirm':70 'connect':189 'convers':151 'crypto API gateway' 'data':120,124,230 'decim':94 'demonstr':241 'deploy':246 'descript':222 'detail':196 'doc':179 'document':174,205 'earli':244 'early-stag':243 'embed':135 'emphas':163 'endpoint':55,154,212,217 'equal':87 'estim':145 'exact':100 'exampl':208 'exchang':140 'export':125 'extrem':176 'feed':139 'financ':136 'gas':144 'gate':250 'generat':152 'geocod':149 'howev':173 'includ':119 'infrastructur':147 'insight':126 'instant':171 'json-response' 'key':166 'label':59 'learn':129 'limit':169 'list':156 'live':73 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':128 'made':97 'make':226 'metric':122 'micropayment API' 'multipl':116 'network':9,24,52 'no-api-key' 'openapi':200 'page':184 'particular':219 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,95 'per':3,18,36,89,159 'platform':6,21,39,114,162,236 'post':65 'post-method' 'premium':60 'price':138,181 'prompt':191 'protocol':44 'provid':234 'quot':143 'rate':141,168 'readm':183 'render':186 'report':123 'request':37,66,160 'request/response':203 'requir':74 'return':214 'schema':204 'scheme':101 'second':110 'sentiment':130 'servic':232 'spars':177 'spec':201 'specif':54 'specifi':104 'stage':245 'summar':133 'technic':195 'text':132 'timeout':111 'titl':225 'token':142 'unclear':228 'unit':80 'usdc':15,30,47,82,91 'usdc-base-network' 'use':41,92 'util':148 'valid':150 'via':10,25,98 'wallet':105,190 'web3':137 'x402':11,26,43,68,249 'x402 API' 'x402-gated':248 'x402-payment'","prices":[{"id":"d1322b72-b120-4cf2-80c8-e7ee9c2b4f4f","listingId":"ac5d2161-fe2a-4eef-bb84-96cd07b34fa5","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/301","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:11.199Z"}],"sources":[{"listingId":"ac5d2161-fe2a-4eef-bb84-96cd07b34fa5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/301","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:11.199Z","lastSeenAt":"2026-04-23T14:01:24.488Z"}],"details":{"listingId":"ac5d2161-fe2a-4eef-bb84-96cd07b34fa5","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing the X-PAYMENT header per x402 spec:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/301 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/301"},{"claim":"All listed 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints with per-request USDC micropayments on Base","Testing x402 protocol integration for pay-per-call services","Agent-driven API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume consumers who prefer per-call pricing over subscriptions"],"notFor":["Production workloads requiring documented, stable API contracts","Users who need detailed request/response schemas before integration","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.76Z"},"updatedAt":"2026-04-23T14:01:24.488Z"}}