{"id":"e20f59d6-ed3f-41df-8d59-b80bb185ae80","shortId":"yELhAg","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/customers/45` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, 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 crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the `/api/v1/customers/45` endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-billing","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","Base network API","low fee API","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The purpose and expected input of /api/v1/customers/45 is undocumented and unclear","The broad catalog of endpoints (AI, finance, utilities) is listed but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/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/customers/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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The purpose of the specific /api/v1/customers/45 endpoint is unclear beyond its generic 'Premium API Access' 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'/api/v1/customers/45':96,224 '/docs':169 '/pricing':170 '/readme':173 '/request':19,38 '0.02':18,37,128,161 '000':116 '0x8335':122 '20':115 '2913':123 '402':212 '6':133 'Base network API' 'USDC API' 'accept':104 'access':102 'addit':139 'advertis':110 'ai':12,31,57 'ai-inference' 'analysi':143 'analyt':56 'api':5,24,45,83,101 'asset':121 'avail':199 'base':8,27,76,117,125 'bodi':222 'broad':50 'broader':136 'call':4,23,130 'catalog':51 'challeng':109,213 'classif':146 'confirm':207 'connect':179 'content':185 'convers':154 'cost':113 'cover':10,29 'crawl':202 'crypto-paid API' 'data':11,30,55 'data-analytics' 'decim':134 'document':164,194,216 'embed':147 'enabl':44 'endpoint':16,35,53,66,94,140,205,225 'equal':127 'exampl':198 'exchang':150 'expect':226 'extrem':166 'feed':149 'financ':13,32,60 'finance-data' 'geocod':152 'infrastructur':63 'key':84 'learn':59 'limit':87 'list':98,138 'live':208 'low fee API' 'lowpaymentfee.com':39 'machin':58 'materi':203 'maximum':112 'micropayment API' 'network':77 'no-api-key' 'offer':48 'openapi':189 'page':174 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,129 'per-request':69 'per-request-billing' 'platform':6,25,46,137 'point':163 'post':105 'post-endpoint' 'premium':100 'price':148,162 'prompt':181 'proper':211 'protocol':81 'rate':86,151 'render':176 'request':71,106,221 'request/response':192 'requir':91 'respons':229 'return':209,231 'schema':193 'sentiment':142 'span':54 'spars':167 'spec':190 'specif':93 'subscript':90 'summar':145 'text':144 'unclear':219 'unit':118 'usag':197 'usdc':9,28,73,120,131 'usdc-base-network' 'use':72,132 'util':15,34,64 'utility-services' 'valid':153 'via':78 'wallet':180 'web3':61 'without':215 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"05960483-2eac-4f39-b103-a3929fa712c6","listingId":"e20f59d6-ed3f-41df-8d59-b80bb185ae80","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/customers/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":"2026-04-18T18:37:44.601Z"}],"sources":[{"listingId":"e20f59d6-ed3f-41df-8d59-b80bb185ae80","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:44.601Z","lastSeenAt":"2026-04-23T16:06:41.447Z"}],"details":{"listingId":"e20f59d6-ed3f-41df-8d59-b80bb185ae80","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/45 \\\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/customers/45"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/45"}],"useCases":["Accessing premium data or customer records on a per-call basis without subscriptions","Running AI inference (sentiment, summarization, classification, embeddings) with crypto micropayments","Fetching financial data like token quotes, exchange rates, and gas estimates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments in USDC on Base via x402","Projects needing low-cost, pay-as-you-go access to a variety of utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.107Z"},"updatedAt":"2026-04-23T16:06:41.447Z"}}