{"id":"7ef83e70-630f-42ea-84af-f8e27c6d127e","shortId":"nugLrq","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request. Payment is settled in USDC on the Base network, requiring no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/payments/110` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, generation) all at the same $0.02 price point. The x402 challenge confirms the endpoint is live, accepting POST requests, and charging a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call on the Base network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this specific endpoint accepts or returns. The endpoint is confirmed live via its 402 challenge, but without documentation it is difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["premium API","low fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The exact functionality of /api/v1/payments/110 ('Premium API Access') is undocumented; it is unclear what request body is expected or what the response contains.","No OpenAPI or schema specification is provided.","The platform lists many endpoints on its landing page but this specific path (/api/v1/payments/110) does not appear among them, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/110","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/payments/110","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 via a valid 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 specific function of this 'Premium API Access' endpoint is unknown. The docs pages are empty beyond a wallet-connect 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'/api/v1/payments/110':98 '/docs':190 '/pricing':192 '/readme':194 '0.02':12,28,72,147,173 '000':167 '20':166 '402':234 '6':177 'Base network API' 'USDC API access' 'accept':158,224 'access':7,23,40,103 'ai':60 'analysi':130 'analyt':59 'api':6,22,39,86,102 'base':9,25,82,168,183 'beyond':115 'call':4,20,180 'categori':68 'challeng':107,152,235 'charg':162 'classif':133 'commit':94 'confirm':153,230 'connect':200 'content':206 'convers':141 'data':58 'decim':178 'difficult':241 'document':114,185,215,238 'embed':134 'endpoint':34,51,97,126,155,223,228 'exact':110 'exampl':218 'exchang':137 'expect':252 'extrem':187 'feed':136 'financ':63 'function':111 'generat':142 'geocod':139 'given':174 'i.e':172 'infrastructur':66 'key':87 'know':243 'label':100,117 'land':121 'learn':62 'limit':90 'list':123 'live':157,231 'low fee API' 'lowpaymentfee.com':36 'machin':61 'mani':50 'maximum':164 'metric':127 'micropayment API' 'network':83,184 'no-api-key' 'numer':124 'offer':52 'one':48 'openapi':210 'page':122,195 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payload':245 'payment':44,75 'per':3,13,19,29,73,179 'platform':55,119 'point':149 'post':159 'post-endpoint' 'premium':5,21,38,101 'premium API' 'price':70,135,148 'prompt':202 'protocol':45 'provid':37 'rate':89,138 'render':197 'report':128 'request':14,30,74,160 'request/response':213 'requir':84 'respons':250 'return':226 'schema':214 'send':247 'sentiment':129 'settl':77 'span':57 'spars':188 'spec':211 'specif':96,222 'summar':132 'text':131 'unit':169 'upfront':93 'usdc':16,32,79,171,175 'usdc-base-settlement' 'util':67 'valid':140 'via':10,26,41,232 'wallet':201 'web3':64 'without':237 'x402':11,27,43,106,151 'x402 API' 'x402-payment'","prices":[{"id":"db84aa29-2baf-41ae-85ab-79baaadc2003","listingId":"7ef83e70-630f-42ea-84af-f8e27c6d127e","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/payments/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:25.143Z"}],"sources":[{"listingId":"7ef83e70-630f-42ea-84af-f8e27c6d127e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:25.143Z","lastSeenAt":"2026-04-23T19:01:17.295Z"}],"details":{"listingId":"7ef83e70-630f-42ea-84af-f8e27c6d127e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/110 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/110"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/110"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring guaranteed SLAs or support contracts","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.907Z"},"updatedAt":"2026-04-23T19:01:17.295Z"}}