{"id":"cd5a628a-681c-4a15-9c5f-a8e6724cbbaa","shortId":"6xRMnw","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/item/10` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 usage examples available from the crawl. The exact functionality behind `/api/v1/item/10` (\"Premium API Access\") is unclear — it could be a generic item endpoint or a placeholder. Agents should test with a real payment to discover the actual response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet' with no content","The exact functionality of /api/v1/item/10 ('Premium API Access') is not described anywhere; its purpose is unclear","No request body schema or response examples are documented","The broader platform lists many endpoints but none have documented schemas or usage guides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/10","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/item/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and the specific purpose of /api/v1/item/10 is undefined. This is effectively a stub 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'/api/v1/item/10':102,217 '/docs':179 '/pricing':180 '/readme':183 '/request':12,28 '0.02':11,27,61,131,171 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '20':125 '402 payment protocol' '6':136 'Base network API' 'USDC micropayment API' 'accept':117 'access':108,220 'actual':243 'addit':150 'address':142 'advertis':149 'agent':233 'ai/ml':51 'analysi':154 'analyt':50 'api':5,14,21,30,39,79,107,219 'application/json':111 'attach':90 'avail':209 'base':8,24,69,127,145 'behind':216 'broad':44 'broader':147 'call':4,20,139 'caller':88 'catalog':45 'challeng':114 'charg':121 'classif':157 'commit':87 'confirm':115 'connect':189 'content':195 'cost':60 'could':224 'crawl':212 'data':49,54 'decim':137 'discov':241 'document':174,204 'embed':158 'enabl':38 'endpoint':47,59,100,151,229 'everi':58 'exact':214 'exampl':208 'exchang':161 'extrem':176 'feed':160 'finance/web3':53 'format':245 'function':215 'generic':227 'geocod':163 'header':94 'infer':52 'item':228 'json-api' 'key':15,31,80 'limit':83 'list':104 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'maximum':123 'network':70 'no-api-key' 'no-rate-limit' 'offer':42 'openapi':199 'page':184 'paid':64 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':74,93,239 'per':3,19,62,138 'placehold':232 'platform':6,22,40,148 'point':173 'post':118 'premium':106,218 'price':159,172 'prompt':191 'protocol':75 'rate':82,162 'real':238 'render':186 'request':63,97,119 'request/response':202 'requir':16,32 'respons':244 'return':110 'schema':203 'sentiment':153 'servic':57 'settl':140 'simpli':89 'sinc':133 'span':48 'spars':177 'spec':200 'specif':99 'subscript':86 'summar':156 'test':235 'text':155 'unclear':222 'unit':128 'usag':207 'usd':132 'usdc':66,130,134 'usdc-base' 'use':135 'util':56 'valid':164 'via':9,25,71 'wallet':190 'x402':10,26,37,73,92,113 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"5a65ac69-8d1f-4783-b605-95aeae44bd39","listingId":"cd5a628a-681c-4a15-9c5f-a8e6724cbbaa","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/item/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:55.940Z"}],"sources":[{"listingId":"cd5a628a-681c-4a15-9c5f-a8e6724cbbaa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:55.940Z","lastSeenAt":"2026-04-24T23:02:33.752Z"}],"details":{"listingId":"cd5a628a-681c-4a15-9c5f-a8e6724cbbaa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/10 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base, maxAmountRequired 20000 base units (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/item/10"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/10"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402","Programmatic access to data/analytics/AI endpoints with crypto micropayments"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go API access","Developers who want to avoid subscription overhead for occasional API calls","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.443Z"},"updatedAt":"2026-04-24T23:02:33.752Z"}}