{"id":"c06319ba-a0a2-4d17-82e8-b3004387642f","shortId":"3KDWY4","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/302` 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, this specific listing covers only the `/api/v1/charges/302` endpoint, whose exact functionality beyond \"Premium API Access\" is not documented in the crawled material.\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 spec, no request/response schema documentation, and no usage examples available from the crawled pages. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"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, /README all return only 'Connect wallet' with no content","The exact functionality of /api/v1/charges/302 ('Premium API Access') is unknown; no request or response schema is provided","No OpenAPI specification or ai-plugin manifest found","Cannot verify what data or service is returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/302","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/302","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' is completely undocumented. This is effectively a stub 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'/api/v1/charges/302':56,177 '/docs':198 '/pricing':200 '/readme':202 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':241 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,185 'across':124 'actual':250 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95,184 'attach':106 'avail':228 'base':9,24,50,75,83 'base-network' 'beyond':182 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':243 'charg':79 'classif':141 'collect':34 'commit':101 'confirm':236 'connect':208 'content':214 'contract':71 'convers':158 'cover':174 'crawl':191,231 'crypto-paid API' 'data':127,131,246 'decim':93 'document':188,193,223 'embed':142 'endpoint':41,54,123,178,234 'equal':86 'estim':152 'exact':180 'exampl':227 'exchang':147 'export':132 'extrem':195 'feed':146 'financ':143 'four':125 'function':181 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'howev':170 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':162,173 'live':237 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'materi':192 'maximum':78 'metric':129 'network':51 'no-api-key' 'openapi':218 'page':203,232 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116,254 'per':3,18,38,88 'platform':121 'point':169 'post':64 'post-endpoint' 'premium':5,20,59,183 'premium API access' 'price':145,168 'prompt':210 'proof':117 'proper':240 'protocol':47 'quot':150 'rate':97,148 'report':130 'request':39,65,89 'request/response':221 'requir':103 'return':205,238,251 'schema':222 'sentiment':137 'servic':248 'settl':68 'simpli':105 'spars':196 'spec':219 'specif':53,172 'substant':213 'success':253 'summar':140 'text':139 'token':149 'unit':84 'unknown':256 'upfront':100 'upon':252 'usag':226 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':209 'web3':144 'whose':179 'x':109 'x-payment':108 'x402':11,26,45,115,242 'x402 API' 'x402-payment'","prices":[{"id":"9300aa11-262e-4865-9beb-07d44a79c08e","listingId":"c06319ba-a0a2-4d17-82e8-b3004387642f","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/302","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:03.668Z"}],"sources":[{"listingId":"c06319ba-a0a2-4d17-82e8-b3004387642f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/302","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:03.668Z","lastSeenAt":"2026-04-24T00:31:56.976Z"}],"details":{"listingId":"c06319ba-a0a2-4d17-82e8-b3004387642f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/302 \\\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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/302"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/302"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to web services via x402 protocol"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-throughput use cases where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.604Z"},"updatedAt":"2026-04-24T00:31:56.976Z"}}