{"id":"6f317fd9-a407-45d7-99b6-1175a84f5f14","shortId":"qrVpXb","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 broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific resource at `/api/v1/generate/resource/143` is listed under the generic title \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests, settling in USDC (contract 0x8335…) on Base with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. The endpoint returns `application/json`.\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, and no usage examples available from the crawl. The exact functionality behind resource ID 143 is not documented, so the specific behavior of this endpoint cannot be confirmed beyond the generic \"Premium API Access\" label and the site-wide catalog categories.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided","The exact functionality of /api/v1/generate/resource/143 is unknown; 'Premium API Access' is a generic label","Cannot verify what data or service this specific resource ID returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/143","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/generate/resource/143","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, documentation is essentially nonexistent — all doc pages show only 'Connect wallet.' There is no OpenAPI spec, no request/response schema, no examples, and the specific function of resource 143 is 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'/request':13,28 '0.02':12,27,86,146 '000':142 '0x8335':133 '143':212 '20':141 '300':161 '6':150 'Base network API' 'USDC micropayment API' 'accept':126 'access':7,22,38,118,231 'ai/ml':59 'amount':139 'analysi':62 'analyt':58 'api':6,21,37,55,95,117,174,230 'application/json':167 'avail':202 'base':9,24,91,135,143 'behavior':219 'behind':209 'beyond':226 'broad':48 'call':4,19,54 'cannot':223 'catalog':49,238 'categori':239 'challeng':121 'classif':64 'commit':103 'confirm':122,225 'connect':183 'content':189 'contract':132 'convers':81 'cost':85 'crawl':205 'crypto-paid API' 'data':57 'decim':151 'doc':173 'document':168,215 'embed':65 'endpoint':32,165,222 'estim':75 'exact':157,207 'exampl':201 'exchang':70 'extrem':170 'feed':69 'financ':66 'function':208 'gas':74 'generat':82 'generic':114,228 'geocod':79 'given':147 'host':46 'i.e':145 'id':211 'infer':60 'infrastructur':77 'json-response' 'key':96 'label':232 'limit':99 'list':111 'live':125 'lowpaymentfee' 'lowpaymentfee.com':34 'made':154 'max':138 'minimum':102 'network':92 'no-api-key' 'openapi':193 'page':178 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call' 'pay-per-request API' 'payment':42,152 'per':3,18,53 'post':127 'post-method' 'premium':5,20,36,116,229 'premium API access' 'price':68,175 'prompt':185 'protocol':43 'provid':35 'quot':73 'rate':71,98 'readm':177 'render':180 'request':84,128 'request/response':196 'requir':104 'resourc':107,210 'return':166 'schema':197 'scheme':158 'second':162 'sentiment':61 'settl':129 'site':45,236 'site-wid':235 'span':56 'spars':171 'spec':194 'specif':106,218 'summar':63 'timeout':163 'titl':115 'token':72 'unit':144 'usag':200 'usdc':15,30,88,131,148 'usdc-base' 'util':78 'valid':80 'via':10,25,39,155 'wallet':184 'web3':67 'wide':237 'x402':11,26,41,120 'x402 API' 'x402-payment'","prices":[{"id":"9330f749-0a7b-4cff-b1d2-939f67930b75","listingId":"6f317fd9-a407-45d7-99b6-1175a84f5f14","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/generate/resource/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:41.750Z"}],"sources":[{"listingId":"6f317fd9-a407-45d7-99b6-1175a84f5f14","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:41.750Z","lastSeenAt":"2026-04-22T20:00:44.575Z"}],"details":{"listingId":"6f317fd9-a407-45d7-99b6-1175a84f5f14","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/143 \\\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 categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC on Base, maxAmountRequired 20000 base units ($0.02), exact scheme, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/143"}],"useCases":["Programmatic access to a paid API endpoint without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Integrating pay-as-you-go API calls into Web3 applications"],"bestFor":["Developers wanting keyless, pay-per-call API access settled in USDC","AI agents that can autonomously pay for API calls via x402","Users on the Base L2 network looking for low-fee micropayment APIs"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without USDC on Base or unfamiliar with x402 payment flows","High-volume use cases where per-request pricing may add up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.011Z"},"updatedAt":"2026-04-22T20:00:44.575Z"}}