{"id":"6156d1a7-9617-497b-8887-773a505da574","shortId":"7EnfXX","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 hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/108` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. All endpoints accept POST requests and return JSON.\n\nThe x402 challenge for this endpoint specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The endpoint is live and returning a valid 402 challenge.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","price-feeds","exchange-rates","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["The exact purpose and input/output schema of /api/v1/inbox/108 is unknown — 'Premium API Access' is the only description available.","No OpenAPI specification, request examples, or response examples are provided for any endpoint on the platform.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful documentation.","The platform lists many endpoint categories but none have detailed documentation; actual functionality is unverifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/108","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/108","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, but the specific functionality of /api/v1/inbox/108 ('Premium API Access') is entirely undocumented. No OpenAPI schema, no request/response examples, and no description of what this particular inbox endpoint does. The broader site lists many endpoints but provides no detailed docs for any of them. Pricing is clear at 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'/request':19,38 '0.02':18,37,69,177 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':185 '20000':168 '402':196 '6':173 'Base network API' 'USDC API' 'accept':152 'access':113 'account':87 'address':184 'advertis':92,127 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':131 'analyt':55 'api':5,24,45,85,112 'attach':95 'base':8,27,77,169,187 'beyond':121 'broader':125 'call':4,23,179 'caller':93 'challeng':160,197 'classif':134 'classification' 'collect':50 'convers':146 'crypto-paid API' 'data':11,30,54,59,148 'data-analytics' 'decim':174 'document':120 'embed':135 'embeddings' 'enabl':44 'endpoint':16,35,52,65,105,128,151,163,189 'equal':176 'estim':143 'everi':64 'exact':116 'exchang':138 'exchange-rates' 'feed':137 'financ':13,32 'finance/web3':58 'function':117 'gas':142 'general':61 'generat':149 'geocod':144 'geocoding' 'header':99 'host':48 'infer':57 'json':157 'key':86 'label':123 'limit':90 'list':109 'live':191 'low fee API' 'lowpaymentfee.com':39 'maxamountrequir':166 'micropayment API' 'network':78 'offer':10,29 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':82,98,180 'per':3,22,70,178 'per-request-billing' 'platform':6,25,46,126 'post':153 'premium':111 'price':67,136 'price-feeds' 'protocol':83 'quot':141 'rate':89,139 'request':71,102,154 'return':156,193 'sent':182 'sentiment':130 'sentiment-analysis' 'servic':63 'settl':72 'simpli':94 'span':53 'specif':104 'specifi':164 'summar':133 'text':132 'text-summarization' 'token':140 'unit':170 'usdc':9,28,74,172 'usdc-base' 'util':15,34,62 'utility-services' 'valid':145,195 'via':79 'x402':43,81,97,159 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"90905f23-da5e-4fd7-8ac8-8056bf61af6a","listingId":"6156d1a7-9617-497b-8887-773a505da574","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.943Z"}],"sources":[{"listingId":"6156d1a7-9617-497b-8887-773a505da574","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.943Z","lastSeenAt":"2026-04-22T12:05:14.530Z"}],"details":{"listingId":"6156d1a7-9617-497b-8887-773a505da574","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/108 \\\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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/108 specifies maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/108"},{"claim":"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 network","source_url":"https://lowpaymentfee.com/api/v1/inbox/108"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility microservice in automated pipelines","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-commitment, no-signup API access","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.859Z"},"updatedAt":"2026-04-22T12:05:14.530Z"}}