{"id":"079e63b0-08b8-4e70-840e-f4e8a8891108","shortId":"SeWpnR","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 is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint at `/api/v1/charges/45` is listed as \"Premium API Access\" and accepts payment via the x402 protocol on the Base network using USDC (contract 0x8335…2913). Each call costs $0.02 (20,000 base units of USDC with 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 provider's landing page advertises four endpoint 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 uniformly priced at $0.02 per request. The probe confirmed the endpoint is live, returning a well-formed 402 challenge with x402 version 1, an \"exact\" payment scheme, and a 300-second timeout.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the `/api/v1/charges/45` path is unclear; it may be a generic charge endpoint or a specific resource. Callers should expect JSON responses (mimeType: application/json) via POST.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The exact functionality of /api/v1/charges/45 ('Premium API Access') is not documented — unclear what it returns","No example requests or responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/45","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/45","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 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/charges/45 is undocumented. This is effectively a stub 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'/api/v1/charges/45':65,248 '/docs':211 '/pricing':213 '/readme':215 '0.02':12,28,91,172 '000':93 '0x8335':86 '1':192 '20':92 '2913':87 '300':199 '402':187 '6':99 'Base network API' 'USDC micropayment API' 'accept':73 'access':7,23,71 'across':52 'addit':226 'advertis':130 'ai':141 'ai/ml':55 'analysi':145 'analyt':54,135 'api':6,22,39,70,102 'application/json':269 'attach':113 'avail':242 'base':9,25,81,94 'base-network' 'behind':246 'beyond':203 'broad':44 'call':4,20,89 'caller':111,263 'catalog':45 'categori':133 'challeng':188 'charg':257 'classif':148 'commit':108 'confirm':177 'connect':221 'contract':85 'convers':164 'cost':90 'crypto-paid API' 'data':53,134,138 'decim':100 'detail':228 'document':202,237 'embed':149 'enabl':38 'endpoint':51,63,132,167,179,258 'estim':159 'exact':194,244 'exampl':240 'exchang':154 'expect':265 'export':139 'extrem':208 'feed':153 'financ':150 'finance/web3':57 'form':186 'four':131 'function':245 'gas':158 'generat':165 'generic':256 'geocod':162 'header':118 'infer':56 'infrastructur':59,161 'insight':140 'json':266 'json-response' 'key':103 'land':128,205 'learn':143 'limit':105 'list':67 'live':181 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':142 'may':253 'metric':136 'mimetyp':268 'network':82 'no-api-key' 'offer':42 'openapi':232 'page':129,206,216 'path':249 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payload':241 'payment':74,117,123,195 'per':3,13,19,29,49,173 'platform':40 'post':271 'post-method' 'premium':5,21,69 'premium API access' 'price':152,170 'probe':176 'prompt':223 'proof':124 'protocol':78 'provid':126 'quot':157 'rate':104,155 'render':218 'report':137 'request':14,30,50,174 'request/response':235 'requir':110 'resourc':262 'respons':267 'return':182 'schema':236 'scheme':196 'second':200 'sentiment':144 'simpli':112 'spars':209 'spec':233 'specif':62,261 'summar':147 'technic':227 'text':146 'timeout':201 'token':156 'unclear':251 'uniform':169 'unit':95 'upfront':107 'usdc':16,32,84,97 'usdc-settlement' 'use':83 'util':60 'valid':121,163 'version':191 'via':10,26,75,270 'wallet':222 'web3':151 'well':185 'well-form':184 'x':116 'x-payment':115 'x402':11,27,37,77,122,190 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"ba07fd65-43f6-4aba-937b-9c6a8c10e27f","listingId":"079e63b0-08b8-4e70-840e-f4e8a8891108","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:25.344Z"}],"sources":[{"listingId":"079e63b0-08b8-4e70-840e-f4e8a8891108","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:25.344Z","lastSeenAt":"2026-04-23T01:01:24.471Z"}],"details":{"listingId":"079e63b0-08b8-4e70-840e-f4e8a8891108","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/45 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with x402Version 1, exact scheme, on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/charges/45"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/charges/45"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/45"},{"claim":"Landing page lists uniform $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across 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 analytics, AI, finance, or utility endpoints","Crypto-native applications that settle API costs in USDC on Base"],"bestFor":["AI agents or bots that need keyless, instant API access via x402","Developers who prefer per-request crypto micropayments over subscriptions","Low-volume or sporadic API consumers who want zero commitment"],"notFor":["High-volume consumers who need bulk pricing or rate guarantees","Users who require detailed API documentation or OpenAPI specs before integrating","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.662Z"},"updatedAt":"2026-04-23T01:01:24.471Z"}}