{"id":"d6052682-9353-4fb8-8bda-0609c17f584d","shortId":"FshQA5","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/charges/191` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nWhile the site advertises a broad catalog of endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), the specific functionality behind `/api/v1/charges/191` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt. This makes it difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific functionality of /api/v1/charges/191 ('Premium API Access') is not described anywhere","No OpenAPI or request/response schema provided","No example responses available to verify what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/191","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality behind this endpoint is entirely undescribed. The docs pages render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,69,127 '000':116 '0x8335':121 '20':115 '2913':122 '300':137 '402':110 '402 payment endpoint' '6':125 'Base network API' 'USDC micropayment API' 'accept':142 'access':7,22,38,106,187 'advertis':151 'ai/ml':58 'analysi':160 'analyt':57 'api':6,21,37,54,80,105,186,203 'application/json':147 'attach':89 'base':9,24,77,117,124 'base-network' 'behind':177 'beyond':182 'broad':153 'call':4,19,129 'caller':87 'catalog':154 'challeng':111 'classif':163 'collect':48 'connect':209 'convers':171 'crypto-paid API' 'data':56,62,219 'decim':126 'detail':195 'determin':217 'difficult':215 'doc':200 'document':181,196 'embed':164 'endpoint':32,99,141,156,224 'exact':134 'exampl':193 'exchang':167 'feed':166 'financ':60 'found':198 'function':176 'generat':173 'generic':184 'geocod':169 'header':93 'host':46 'infer':59 'infrastructur':64 'json-response' 'key':81 'label':188 'limit':84 'list':102 'lowpaymentfee' 'lowpaymentfee.com':34 'make':213 'metric':157 'network':78 'no-api-key' 'openapi':190 'page':204 'particular':223 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payment':42,92,131 'per':3,18,52,70,128 'post':143 'premium':5,20,36,104,185 'price':67,165,201 'prompt':211 'protocol':43 'provid':35 'rate':83,168 'render':206 'report':158 'request':53,71,96,112,144 'request/response':192 'requir':86 'return':108,146,225 'schema':191 'scheme':132 'second':138 'sentiment':159 'servic':221 'settl':72 'simpli':88 'site':45,150 'span':55 'specif':98,175 'summar':162 'text':161 'timeout':139 'unit':118 'usdc':15,30,74,120 'usdc-settlement' 'util':65 'valid':170 'via':10,25,39 'wallet':210 'web3':61 'x402':11,26,41,91 'x402 API' 'x402-payment'","prices":[{"id":"9f72578c-0829-4310-938c-7c0f7bd54611","listingId":"d6052682-9353-4fb8-8bda-0609c17f584d","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:33.304Z"}],"sources":[{"listingId":"d6052682-9353-4fb8-8bda-0609c17f584d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:33.304Z","lastSeenAt":"2026-04-24T00:31:55.669Z"}],"details":{"listingId":"d6052682-9353-4fb8-8bda-0609c17f584d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/191 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/191"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.072Z"},"updatedAt":"2026-04-24T00:31:55.669Z"}}