{"id":"825b973c-f028-407c-8b3c-1cde7db6d017","shortId":"h49qzf","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, 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/106` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the asset contract is the canonical Base USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The timeout for payment is 300 seconds.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The exact functionality behind the `/api/v1/inbox/106` path is unclear; it does not correspond to any of the named endpoints on the landing page. Without schemas or documentation, callers will need to experiment to determine accepted request bodies and response formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api","no-auth api","402 payment api"],"warnings":["The path /api/v1/inbox/106 does not match any named endpoint on the landing page; its exact functionality is unknown.","No request or response schemas are available — callers must guess at accepted payloads.","Documentation pages (/api, /pricing, /README) contain no useful content beyond 'Connect wallet'.","No rate limit, SLA, or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/106","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response documentation, no examples, and the specific /api/v1/inbox/106 path is not described on the landing page. The /api, /pricing, and /README pages are empty beyond a wallet prompt. This is effectively a stub 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'/api/v1/inbox/106':112,224 '/pricing':204 '/readme':206 '/request':19,38 '0.02':18,37,95,134 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':173 '20':128 '300':179 '402':123 '402 payment api' '6':139 'accept':253 'access':118 'across':54 'addit':217 'address':161 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153 'asset':166 'avail':188 'base':8,27,103,130,142,171 'base usdc api' 'behind':222 'bodi':255 'broad':50 'call':4,23 'caller':246 'canon':170 'catalog':51 'categori':56 'challeng':124 'cheap api' 'classif':71 'classification' 'connect':212 'content':218 'contract':167 'convers':88 'correspond':231 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':140 'descript':198 'determin':252 'document':181,245 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,189,237 'estim':82 'exact':149,220 'exampl':201 'exchang':77 'experi':250 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'format':258 'four':55 'function':221 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':154 'land':185,240 'learn':66 'limit':157 'list':114,187 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':145 'metric':59 'micropayment api' 'minim':183 'name':236 'need':248 'network':104 'no-auth api' 'offer':10,29 'page':186,207,241 'paramet':197 'path':225 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143,160,177 'per':3,22,96 'platform':6,25,46 'premium':116 'price':75,93,191 'prompt':214 'protocol':108 'provid':193 'quot':80 'rate':78,156 'report':60 'request':97,125,254 'request/response':195 'requir':158 'resolv':209 'respons':257 'return':120 'schema':196,243 'scheme':150 'second':180 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':136 'specif':110 'summar':70 'text':69 'text-summarization' 'timeout':175 'token':79 'unclear':227 'unit':131 'usag':200 'usd':135 'usdc':9,28,100,133,137,172 'usdc-base' 'use':138 'util':15,34,85 'utility-apis' 'valid':87,122 'via':105,146 'wallet':213 'web3':74 'without':242 'x402':43,107,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"135c3768-867e-4207-9711-64be9dd96f30","listingId":"825b973c-f028-407c-8b3c-1cde7db6d017","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.860Z"}],"sources":[{"listingId":"825b973c-f028-407c-8b3c-1cde7db6d017","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.860Z","lastSeenAt":"2026-04-22T12:05:14.360Z"}],"details":{"listingId":"825b973c-f028-407c-8b3c-1cde7db6d017","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/106 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/106 requests up to 20,000 base units of USDC (USD Coin) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/inbox/106"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/inbox/106"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto gas estimates or token quotes via micropayment","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents needing keyless, pay-per-use API access","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications that can settle USDC on Base"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and typed schemas before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.973Z"},"updatedAt":"2026-04-22T12:05:14.360Z"}}