{"id":"26e1a55c-f211-45a3-8202-192498e929eb","shortId":"P7BHeF","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 pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/117` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, and no rate limits. Callers attach an `X-PAYMENT` header with a valid payment proof and receive the response immediately.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data 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 listed endpoints share the same $0.02/request pricing.\n\nHowever, the specific functionality behind the `/api/v1/inbox/117` path is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. Prospective callers should be aware that the actual behavior of this particular endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/inbox/117 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","No OpenAPI or JSON schema is available for request or response payloads.","Documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.","The platform lists many endpoint categories on its homepage but none have detailed docs visible without a wallet connection."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/117","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/inbox/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint does, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage are empty. The listing is effectively a 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'/request':19,38,172 '0.02':18,37,80,171 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,191 'actual':227 'addit':218 'advertis':128 'ai':12,31,139 'analysi':143 'analyt':133 'api':5,24,45,74,100,190,207 'attach':109 'avail':236 'awar':224 'base':8,27,63,85 'base-network' 'behavior':228 'behind':178 'beyond':185 'broad':50 'call':4,23,82 'caller':108,221 'catalog':51 'categori':131 'classif':146 'connect':213 'convers':163 'cost':77 'cover':10,29 'crawl':202 'data':11,30,132,136 'decim':91 'detail':219 'doc':203 'document':184,237 'embed':147 'enabl':44 'endpoint':16,35,57,67,130,167,232 'estim':157 'exampl':199 'exchang':152 'export':137 'feed':151 'financ':13,32,148 'four':129 'function':177 'gas':156 'generat':164 'generic':187 'geocod':161 'handl':94 'header':114 'howev':174 'http-post' 'immedi':124 'infrastructur':159 'insight':138 'key':101 'label':188 'learn':141 'limit':107 'list':71,166 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':140 'metric':134 'micropayment API' 'minim':212 'network':64 'no-api-key' 'offer':48 'openapi':195 'page':204 'particular':231 'path':181 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,113,118 'per':3,22,55,81 'platform':6,25,46,127 'premium':73,189 'premium API access' 'price':150,173,205 'prompt':215 'proof':119 'prospect':220 'protocol':98 'quot':155 'rate':106,153 'readm':206 'receiv':121 'report':135 'request':56 'request/response':198 'resolv':209 'respons':123 'schema':196 'sentiment':142 'settl':58 'share':168 'specif':66,176 'subscript':103 'summar':145 'text':144 'token':154 'unclear':234 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,160 'valid':117,162 'via':95 'wallet':214 'web3':149 'wider':126 'x':112 'x-payment':111 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f9c8f2de-ea76-487b-aea1-9c5493353753","listingId":"26e1a55c-f211-45a3-8202-192498e929eb","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/inbox/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.388Z"}],"sources":[{"listingId":"26e1a55c-f211-45a3-8202-192498e929eb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/117","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.388Z","lastSeenAt":"2026-04-22T15:02:58.047Z"}],"details":{"listingId":"26e1a55c-f211-45a3-8202-192498e929eb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/117 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/117"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/117"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand, per-call payment for data or AI services","Integrating low-cost utility endpoints (geocoding, validation, conversion) into pipelines"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access on Base","Use cases requiring no upfront commitment or rate-limit negotiation","Crypto-native applications that can sign USDC payments on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.141Z"},"updatedAt":"2026-04-22T15:02:58.047Z"}}