{"id":"269cf43b-bd6b-4d43-b278-33a195d563f4","shortId":"HLDaXN","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/158` is labeled \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The caller simply includes an X-PAYMENT header with a valid payment proof. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/messages/158` resource specifically is unclear — it may be a messaging or content retrieval endpoint, but this is not documented. Prospective users should be prepared to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The purpose of /api/v1/messages/158 ('Premium API Access') is undocumented — unclear what it returns","All non-landing pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No request body schema or response schema is provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/158","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/messages/158","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for the /messages/158 resource, and no usage examples. The crawled pages beyond the landing page are empty. The specific purpose of this endpoint is 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'/api/v1/messages/158':112 '/messages/158':223 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,94,130 '000':125 '20':124 '6':135 'accept':172 'access':117 'across':54 'addit':203 'advertis':119 'ai':12,31,63 'analysi':67 'analyt':58 'api':5,24,45,116,148 'application/json':178 'base':8,27,102,126 'base network api' 'beyond':181 'broad':50 'call':4,23,138 'caller':157 'catalog':51 'categori':56 'classif':70 'connect':198 'contact':250 'content':234 'convers':87 'cost':122 'data':11,30,57 'decim':136 'detail':205,254 'document':180,214,241 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,171,236 'estim':81 'exact':145 'exampl':218 'exchang':76 'experi':248 'export':61 'expos':48 'feed':75 'financ':13,32,72 'four':55 'gas':80 'generat':88 'geocod':85 'header':164 'http':173 'http-post' 'includ':159 'infrastructur':83 'insight':62 'json-response' 'key':149 'label':114 'land':183 'learn':65 'limit':153 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':141 'maximum':121 'may':229 'messag':232 'metric':59 'micropayment api' 'minim':197 'network':103 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':209 'page':184,192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':139,163,168 'per':3,22,95,137 'platform':6,25,46 'post':174 'premium':115 'prepar':246 'price':74,92 'prompt':200 'proof':169 'prospect':242 'protocol':107 'provid':252 'purpos':220 'quot':79 'rate':77,152 'report':60 'request':96,175 'request/response':212 'requir':155 'resolv':194 'resourc':224 'respons':179 'retriev':235 'return':177 'schema':213 'scheme':146 'sentiment':66 'settl':97 'simpli':158 'sinc':132 'spars':186 'spec':210 'specif':109,225 'subscript':150 'summar':69 'technic':204 'text':68 'token':78 'unclear':227 'unit':127 'usag':217 'usd':131 'usdc':9,28,99,129,133 'usdc api' 'usdc-base' 'use':134 'user':243 'util':15,34,84 'valid':86,167 'via':104,142 'wallet':199 'web3':73 'x':162 'x-payment':161 'x402':43,106,144 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a0431a20-cbd1-43d1-871f-dcfb114c2f5f","listingId":"269cf43b-bd6b-4d43-b278-33a195d563f4","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/messages/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.305Z"}],"sources":[{"listingId":"269cf43b-bd6b-4d43-b278-33a195d563f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.305Z","lastSeenAt":"2026-04-22T02:32:06.683Z"}],"details":{"listingId":"269cf43b-bd6b-4d43-b278-33a195d563f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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","source_url":"https://lowpaymentfee.com/api/v1/messages/158"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/158"}],"useCases":["Accessing pay-per-call API services without subscriptions or API keys","Making micropayments for individual API requests using USDC on Base","Agent-driven workflows that need on-demand API access with crypto settlement"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.237Z"},"updatedAt":"2026-04-22T02:32:06.683Z"}}