{"id":"f3c55e7d-7b52-4d59-96b7-8986f37848a9","shortId":"m9dVbz","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/keys/75` 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, accounts, or subscriptions are required; callers attach an X-PAYMENT header to each request.\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 with no rate limits or minimum commitments.\n\nImportant caveat: the specific endpoint `/api/v1/keys/75` has a generic \"Premium API Access\" description and no documentation explaining what it actually returns. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled pages. The platform's docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further content. Prospective callers should treat this as a low-documentation endpoint and test with a small payment first.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available for the specific endpoint /api/v1/keys/75 — its purpose and response format are unknown","No OpenAPI or schema definitions found anywhere on the site","Docs, pricing, and README pages all resolve to a minimal 'Connect wallet' page with no content","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/75","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/75","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 x402 402 challenge), but there is zero documentation on what `/api/v1/keys/75` actually does or returns. No OpenAPI spec, no request/response schemas, and no examples are available. The docs/pricing/README pages are empty beyond a wallet-connect prompt. The listing is effectively a 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fee' 'low-document':238 'lowpaymentfee.com':39 'machin':132 'metric':126 'micropayment api' 'minim':223 'minimum':171 'network':64 'offer':48 'openapi':197 'page':210,218 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,247 'per':3,22,55,81 'platform':6,25,46,119,212 'premium':73,182 'price':142,165,215 'prompt':226 'prospect':231 'protocol':98 'quot':147 'rate':145,168 'readm':217 'report':127 'request':56,116 'request/response':200 'requir':106 'resolv':220 'return':193 'schema':201 'sentiment':134 'sentiment-analysis' 'settl':58 'share':160 'small':246 'spec':198 'specif':66,176 'subscript':104 'summar':137 'test':243 'text':136 'text-summarization' 'token':146 'treat':234 'unit':86 'usag':204 'usdc':9,28,60,88 'usdc api' 'usdc-base' 'util':15,34,152 'utility-apis' 'valid':154 'via':95 'wallet':225 'web3':141 'wider':118 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"91b60a41-ee76-4e62-ab8d-c3a1223cf00c","listingId":"f3c55e7d-7b52-4d59-96b7-8986f37848a9","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.634Z"}],"sources":[{"listingId":"f3c55e7d-7b52-4d59-96b7-8986f37848a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.634Z","lastSeenAt":"2026-04-22T01:02:18.996Z"}],"details":{"listingId":"f3c55e7d-7b52-4d59-96b7-8986f37848a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/75 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/75"},{"claim":"All listed endpoints cost $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/keys/75"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Accessing utility services like geocoding, validation, and data conversion on a per-request basis"],"bestFor":["AI agents that need keyless, pay-as-you-go API access","Developers wanting low-friction access to multiple endpoint categories without subscriptions","x402-compatible wallets and agent frameworks on the Base network"],"notFor":["High-volume batch processing where per-request pricing becomes expensive","Users who need detailed API documentation and guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.519Z"},"updatedAt":"2026-04-22T01:02:18.996Z"}}