{"id":"b763059c-e6c5-4723-9f14-9ed4837b2c66","shortId":"b4qtpt","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/14` 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/charges/14` 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 usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually does beyond accepting payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific endpoint /api/v1/charges/14 ('Premium API Access') does not map to any of the named services listed on the homepage; its actual functionality is unknown.","No OpenAPI spec or request/response schema is provided; callers cannot know what to send or what they will receive.","No examples of successful responses exist in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/14","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/14","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (/api/v1/charges/14) is entirely unclear. The docs pages are empty beyond a wallet-connect 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'/api/v1/charges/14':56,173 '/docs':207 '/pricing':209 '/readme':211 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':249 '402 payment API' '6':92 'Base network API' 'USDC micropayment API' 'accept':63,257 'access':7,22,42,61,190 'across':124 'actual':254 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95,189 'attach':106 'avail':236 'base':9,24,50,75,83 'base-network' 'beyond':256 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':250 'charg':79 'classif':141 'clear':176 'collect':34 'commit':101 'confirm':244 'connect':217 'content':223 'contract':71 'convers':158 'crawl':239 'crypto-paid endpoint' 'data':127,131,197 'decim':93 'descript':185 'document':194,202 'embed':142 'endpoint':41,54,123,162,172,242 'equal':86 'estim':152 'exampl':235 'exchang':147 'export':132 'extrem':204 'feed':146 'financ':143 'four':125 'function':199 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'howev':169 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':161 'live':245 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'map':177 'materi':240 'maximum':78 'metric':129 'name':182 'network':51 'no-api-key' 'openapi':227 'page':212 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116,258 'per':3,18,38,88 'platform':121 'post':64 'premium':5,20,59,188 'price':145,168 'prompt':219 'proof':117 'protocol':47 'quot':150 'rate':97,148 'render':214 'report':130 'request':39,65,89 'request/response':230 'requir':103 'return':201,246 'schema':231 'sentiment':137 'servic':183 'settl':68 'share':163 'simpli':105,187 'spars':205 'spec':228 'specif':53,171 'substant':222 'summar':140 'text':139 'token':149 'unit':84 'unknown':260 'upfront':100 'usag':234 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157,248 'via':10,25,43 'wallet':218 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"e3355ddd-ea7c-45e0-9ba7-3c1fe8c810cf","listingId":"b763059c-e6c5-4723-9f14-9ed4837b2c66","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:15.211Z"}],"sources":[{"listingId":"b763059c-e6c5-4723-9f14-9ed4837b2c66","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:15.211Z","lastSeenAt":"2026-04-24T01:32:03.918Z"}],"details":{"listingId":"b763059c-e6c5-4723-9f14-9ed4837b2c66","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/14 \\\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 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/14"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/14"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per request for API access without needing API keys or subscriptions","Integrating x402 payment protocol into agent workflows for on-demand data","Demonstrating x402 micropayment flows on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume callers who want no subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call crypto settlement adds latency","Anyone who needs to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.961Z"},"updatedAt":"2026-04-24T01:32:03.918Z"}}