Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (ID 93) via the x402 payment protocol. It is live and returns a 402 challenge requiring payment of up to 20,000 base units of USDC on the Base network, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.
The provider hosts a broader catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network in USDC. The specific endpoint being listed here (/api/v1/emails/93) is not explicitly described on the provider's landing page, so its exact functionality — whether it returns email metadata, validates an email address, or performs some other email-related operation — is unclear from available documentation.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint accepts POST requests and returns application/json, but the request body format and response structure are unknown.
Capabilities
Use cases
- —Accessing email-related data or operations on a per-call payment basis
- —Agent-driven workflows that need email data without managing API keys
- —Programmatic email lookups or processing settled via crypto micropayments
Fit
Best for
- —Developers or agents who want keyless, pay-per-call email API access
- —x402-compatible agents on the Base network with USDC
- —Low-volume or sporadic usage where $0.02/call is cost-effective
Not for
- —High-volume email operations where per-call pricing adds up quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/emails/93 is not described anywhere in the crawled material, making it essentially a stub listing.
Warnings
- —The endpoint /api/v1/emails/93 is not listed on the provider's landing page among their advertised APIs — its purpose is unknown.
- —No documentation exists: /docs, /pricing, /api, and /README all render only a wallet-connect prompt.
- —No OpenAPI spec, request body schema, or response schema is available — callers cannot know what to send or what to expect.
- —The broader site lists many endpoint categories but provides no technical detail for any of them.
Citations
- —The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/93
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/93
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a Connect wallet prompthttps://lowpaymentfee.com/docs