{"id":"abf53ec8-05c9-4918-a69b-1cebccaa68eb","shortId":"EmGAYw","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 provides a broad suite 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/keys/2` is listed as \"Premium API Access\" and returns a 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, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header to each request. The endpoint accepts 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 \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/2` is unclear — it may provide an API key or elevated access, but this is not documented.","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","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and response format of /api/v1/keys/2 is unclear — 'Premium API Access' is not explained","All non-landing pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No request body schema or response examples are documented anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/2","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/keys/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/keys/2 ('Premium API Access') is undocumented. Most site pages beyond the landing page are empty wallet-connect 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'learn':66 'limit':156 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':144 'materi':223 'may':238 'metric':59 'micropayment api' 'network':104 'offer':10,29 'openapi':209 'page':185,193 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':142,167 'per':3,22,96 'platform':6,25,46 'post':175 'premium':116,229 'price':75,93 'prompt':200 'protocol':108 'provid':48,239 'quot':80 'rate':78,155 'report':60 'request':97,124,171,176 'request/response':212 'requir':160 'resolv':195 'respons':180 'return':120,178 'schema':213 'scheme':149 'sentiment':67 'sentiment-analysis' 'settl':98 'simpli':162 'sinc':135 'spars':187 'spec':210 'specif':110 'subscript':159 'suit':51 'summar':70 'technic':204 'text':69 'text-summarization' 'token':79 'unclear':236 'unit':130 'usag':217 'usd':134 'usdc':9,28,100,132,136 'usdc api' 'usdc-base' 'use':137 'util':15,34,85 'utility-apis' 'valid':87 'via':105,145 'wallet':199 'web3':74 'x':166 'x-payment':165 'x402':43,107,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"744534b5-95df-4eb5-829b-de109f595c4b","listingId":"abf53ec8-05c9-4918-a69b-1cebccaa68eb","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/keys/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.415Z"}],"sources":[{"listingId":"abf53ec8-05c9-4918-a69b-1cebccaa68eb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.415Z","lastSeenAt":"2026-04-22T01:02:18.719Z"}],"details":{"listingId":"abf53ec8-05c9-4918-a69b-1cebccaa68eb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (0.02 USD)","source_url":"https://lowpaymentfee.com/api/v1/keys/2"},{"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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/2"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with no subscription commitment","Geocoding, validation, and conversion utilities paid per request via USDC on Base"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can autonomously pay for API calls via x402","Projects already operating on the Base network with USDC"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.77Z"},"updatedAt":"2026-04-22T01:02:18.719Z"}}