{"id":"ef4a65da-3ce5-439d-8d21-3c113f945a88","shortId":"4Nuv8T","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 offers a suite of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/301` 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 published pricing of $0.02/request across all endpoints.\n\nThe broader platform advertises four categories of APIs: 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 the same $0.02 price point. The site claims no API keys are required, no rate limits, and instant access — payment is handled entirely through the x402 protocol.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what any individual endpoint actually returns. The `/api/v1/charges/301` endpoint itself is live (returns a proper 402 challenge), but its specific functionality beyond the generic \"Premium API Access\" label is unclear. Without documentation or example responses, it is difficult to determine what data or service this particular endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The specific purpose of /api/v1/charges/301 ('Premium API Access') is undefined — unclear what data or service it provides","No request or response examples available anywhere on the site","The broad catalog of endpoints (AI, finance, data, utils) is listed but none have documented inputs or outputs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/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/charges/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. However, there is no OpenAPI schema, no documentation, no request/response examples, and the specific functionality of /api/v1/charges/301 is entirely undocumented. The docs pages are empty beyond a wallet-connect 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'/api/v1/charges/301':58,218 '/docs':181 '/pricing':183 '/readme':185 '/request':99 '0.02':12,28,87,98,151 '000':78 '20':77 '402':226 '6':83 'Base network API' 'USDC API access' 'accept':65 'access':7,23,63,167,237 'across':100 'actual':215 'advertis':73,106 'ai':118 'analysi':122 'analyt':112 'api':6,22,42,62,110,158,236 'base':9,25,52,69,79 'beyond':232 'broader':104 'call':4,20 'categori':108 'challeng':72,227 'claim':156 'classif':125 'connect':191 'consist':90 'content':197 'convers':142 'data':111,115,252 'decim':84 'detail':208 'determin':250 'difficult':248 'document':176,209,242 'embed':126 'endpoint':43,56,102,145,214,219,257 'entir':171 'equal':86 'estim':136 'exampl':205,244 'exchang':131 'export':116 'extrem':178 'feed':130 'financ':127 'four':107 'function':231 'gas':135 'gate':44 'generat':143 'generic':234 'geocod':140 'handl':170 'individu':213 'infrastructur':138 'insight':117 'instant':166 'json-response' 'key':159 'label':60,238 'learn':120 'limit':164 'list':147 'live':222 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':119 'maxamountrequir':75 'metric':113 'micropayment API' 'network':53 'no-api-key' 'offer':34 'openapi':201 'page':186 'particular':256 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payment':48,67,168 'per':3,13,19,29,40,88 'platform':105 'point':153 'premium':5,21,61,235 'price':96,129,152 'prompt':193 'proper':225 'protocol':49,175 'provid':258 'publish':95 'quot':134 'rate':132,163 'report':114 'request':14,30,41,89 'request/response':204 'requir':161 'respons':245 'return':188,216,223 'schema':202 'sentiment':121 'servic':254 'site':93,155 'spars':179 'specif':55,230 'substant':196 'suit':36 'summar':124 'text':123 'token':133 'unclear':240 'unit':80 'usdc':16,32,66,82 'usdc-base' 'util':139 'valid':141 'via':10,26 'wallet':192 'web3':128 'without':241 'x402':11,27,47,71,174 'x402 API' 'x402-payment'","prices":[{"id":"e993fc77-d439-4cb9-bca1-d1bb400098d5","listingId":"ef4a65da-3ce5-439d-8d21-3c113f945a88","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/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":"2026-04-18T18:45:05.448Z"}],"sources":[{"listingId":"ef4a65da-3ce5-439d-8d21-3c113f945a88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/301","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:05.448Z","lastSeenAt":"2026-04-22T09:01:01.800Z"}],"details":{"listingId":"ef4a65da-3ce5-439d-8d21-3c113f945a88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/301 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/301"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site claims no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/301"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.673Z"},"updatedAt":"2026-04-22T09:01:01.800Z"}}