{"id":"f7a73a54-c3b9-4483-b529-03e0a5f790e4","shortId":"wyeAUQ","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 hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/49` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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 are listed at the same $0.02/request price point. However, the specific endpoint `/api/v1/charges/49` does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples of what this endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without knowing what it does, callers are essentially paying blind.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI spec or request/response schema provided","The endpoint path '/api/v1/charges/49' does not correspond to any of the named services listed on the homepage","It is unclear what data or functionality this endpoint returns — callers pay without knowing what they receive"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is zero documentation on what the endpoint actually does, no request/response schema, no examples, and the docs pages are empty. The listing is effectively a 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'/api/v1/charges/49':56,174 '/docs':208 '/pricing':210 '/readme':212 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':250 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,191 'across':124 'actual':240 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95,190 'attach':106 'base':9,24,50,75,83 'base-network' 'blind':262 'broader':119 'call':4,19 'caller':104,258 'categori':126 'challeng':251 'charg':79 'classif':141 'clear':177 'collect':34 'commit':101 'confirm':245 'connect':218 'content':224 'contract':71 'convers':158 'crypto-paid API' 'data':127,131,198 'decim':93 'descript':186 'document':195,203 'embed':142 'endpoint':41,54,123,173,239,243 'equal':86 'essenti':260 'estim':152 'exampl':235 'exchang':147 'export':132 'extrem':205 'feed':146 'financ':143 'four':125 'function':200 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'howev':170 'infrastructur':154 'insight':133 'key':96 'know':254 'label':58 'learn':136 'limit':98 'list':162 'live':246 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'map':178 'maximum':78 'metric':129 'name':183 'network':51 'no-api-key' 'openapi':228 'page':213 'pay':2,17,37,261 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'point':169 'post':64 'post-endpoint' 'premium':5,20,59,189 'premium API access' 'price':145,168 'prompt':220 'proof':117 'proper':249 'protocol':47 'quot':150 'rate':97,148 'render':215 'report':130 'request':39,65,89 'request/response':231 'requir':103 'return':202,241,247 'schema':232 'sentiment':137 'servic':184 'settl':68 'simpli':105,188 'spars':206 'spec':229 'specif':53,172 'substant':223 'summar':140 'text':139 'token':149 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':219 'web3':144 'without':253 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"f8e30238-879f-4fc0-b855-d1d03aca9d67","listingId":"f7a73a54-c3b9-4483-b529-03e0a5f790e4","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:29.594Z"}],"sources":[{"listingId":"f7a73a54-c3b9-4483-b529-03e0a5f790e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:29.594Z","lastSeenAt":"2026-04-22T07:31:04.440Z"}],"details":{"listingId":"f7a73a54-c3b9-4483-b529-03e0a5f790e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/49"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/49"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an unknown premium service at $0.02/call via x402","Demonstrating x402 payment protocol integration on Base","Agent-driven API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment flows on Base","Agents that need keyless, pay-per-use API access","Testing micropayment infrastructure with low-cost calls"],"notFor":["Anyone who needs to know what the endpoint returns before paying","Production use cases requiring documented request/response schemas","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.424Z"},"updatedAt":"2026-04-22T07:31:04.440Z"}}