{"id":"b5adf990-c8c7-4803-bc94-f71d8a2aac71","shortId":"NfFx5D","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/227` is labeled \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThis particular endpoint (`/api/v1/charges/227`) does not have detailed documentation explaining what data or functionality it returns. The crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live via a valid x402 402 challenge, but the lack of schema, examples, or documentation for what the response payload contains limits confidence in what callers will actually receive.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.","The specific endpoint /api/v1/charges/227 has no description of what it returns beyond the label 'Premium API Access'.","No OpenAPI schema, no input/output examples, and no error documentation provided.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none are documented in detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/227","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/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The specific functionality of /api/v1/charges/227 is entirely 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'0.02':10,28,99,147 '000':90 '0x8335':80 '20':89 '2913':81 '402':73,204 '402 payment api' '6':95 'access':6,24,69 'across':107 'actual':226 'addit':193 'advertis':105 'ai':117 'amount':86 'analysi':121 'analyt':111 'api':5,17,23,35,49,68,152 'base':8,26,58,83,91 'base network api' 'broader':103 'call':48 'caller':224 'categori':109 'challeng':74,205 'classif':124 'commit':160 'confid':221 'confirm':198 'connect':188 'contain':219 'content':194 'contract':79 'convers':140 'crawl':178 'data':110,114,172 'decim':96 'detail':168 'doc':179 'document':169,213 'embed':125 'endpoint':50,62,106,143,163,196 'equal':98 'estim':135 'exampl':211 'exchang':130 'explain':170 'export':115 'feed':129 'financ':126 'four':108 'function':174 'gas':134 'gate':3,21,51 'generat':141 'geocod':138 'infrastructur':137 'insight':116 'json-response' 'key':18,36,153 'label':66 'lack':208 'learn':119 'limit':156,220 'list':145 'live':199 'low payment fee' 'lowpaymentfee.com':37 'machin':118 'max':85 'metric':112 'micropayment api' 'minimum':159 'network':59 'no-api-key' 'offer':41 'page':183 'particular':162 'pay':9,27,46 'pay per call api' 'pay-per-cal':45 'pay-per-request' 'payload':218 'payment':76 'per':11,29,47,100,148 'platform':40,104 'post-method' 'premium':4,22,67 'price':128,180 'prompt':190 'protocol':55 'quot':133 'rate':131,155 'readm':182 'receiv':227 'render':185 'report':113 'request':12,30,75,101,149 'requir':87 'respons':217 'return':71,176 'schema':210 'sentiment':120 'specif':61 'suit':43 'summar':123 'text':122 'token':132 'unit':92 'usdc':14,32,78,94 'usdc api access' 'usdc-base' 'valid':139,202 'via':200 'wallet':189 'web3':127 'x402':2,20,54,203 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"57508ca4-6fe7-4516-9c76-a57fd8260486","listingId":"b5adf990-c8c7-4803-bc94-f71d8a2aac71","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/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:36.311Z"}],"sources":[{"listingId":"b5adf990-c8c7-4803-bc94-f71d8a2aac71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/227","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:36.311Z","lastSeenAt":"2026-04-22T09:01:00.402Z"}],"details":{"listingId":"b5adf990-c8c7-4803-bc94-f71d8a2aac71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/227 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/charges/227"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/227"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-call access to data, AI, finance, or utility endpoints","Testing x402 payment flows on Base with low-cost USDC transactions"],"bestFor":["Developers exploring x402 protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume production workloads where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.959Z"},"updatedAt":"2026-04-22T09:01:00.402Z"}}