x402-gated email API endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/32` appears to be part of an email-related API, though the crawled documentation does not detail the emails endpoint specifically. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all gated behind x402 challenges on the Base network.
Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's stated flat pricing of $0.02/request across all endpoints. The provider advertises no API keys, no rate limits, and instant access. The endpoint accepts POST requests and returns application/json.
Documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all rendered only a "Connect wallet" prompt with no substantive content. The exact request schema and response format for the emails endpoint are not documented in any crawled material, so the precise functionality (e.g., email validation, lookup, sending) cannot be confirmed from available sources.
Capabilities
Use cases
- —Programmatic email data retrieval or validation via a single paid API call
- —Agent-driven workflows needing email-related data without subscription commitments
- —Micropayment-gated access to email services from crypto-native applications
Fit
Best for
- —Developers wanting no-signup, pay-per-use email API access
- —AI agents that can settle x402 payments on Base in USDC
- —Projects needing low-cost, on-demand email endpoint calls
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume email operations where $0.02/request adds up significantly
- —Non-crypto users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/32 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation for the emails endpoint specifically — no request schema, no response schema, no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The exact functionality of /api/v1/emails/32 is unknown.
Warnings
- —The emails endpoint is not listed on the provider's landing page among the advertised APIs — its purpose is unclear.
- —No request or response schema is available for this endpoint; functionality must be discovered experimentally.
- —All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no content.
- —The path includes a numeric ID (32) which may reference a specific resource rather than a general-purpose endpoint.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/32
- —USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/32
- —The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The landing page lists APIs across data/analytics, AI/ML, finance/web3, and infrastructure categories but does not list an emails endpointhttps://lowpaymentfee.com