Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.
What it does
This x402-enabled endpoint at `/api/v1/emails/12` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract 0x8335…2913) with no API keys, no rate limits, and no subscriptions required. The specific endpoint probed (`/api/v1/emails/12`) is labeled "Premium API Access" and accepts POST requests.
The x402 challenge confirms the endpoint is live, advertising a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 `exact` scheme to the payee address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout window.
Documentation is extremely sparse. The crawled docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/emails/12` endpoint actually returns. The endpoint path suggests email-related data (possibly a specific email record by ID), but the exact functionality cannot be confirmed from available material. The broader site lists many endpoint categories but provides no documentation for any of them.
Capabilities
Use cases
- —Retrieving email-related data on a per-request payment basis without needing an API key
- —Agent-driven workflows that need to fetch email records and can pay per call via x402
- —Integrating low-cost email data lookups into crypto-native applications
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go email data access
- —AI agents with x402 payment capability on Base
- —Prototyping workflows that need cheap per-call email endpoints
Not for
- —Production use cases requiring documented request/response schemas and SLAs
- —Users who need free or fiat-only payment options
- —High-volume batch email processing (no documented rate limits but no guarantees either)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/12 \
-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 zero documentation on what the endpoint actually does, no request/response schema, and the crawled pages are all empty beyond a wallet connect prompt. Effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'
- —No OpenAPI spec or request/response schema provided
- —The exact purpose of /api/v1/emails/12 is unclear — 'Premium API Access' is generic
- —Cannot verify what data is returned or what input the POST body expects
- —The broader site lists many endpoints but none appear documented
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/emails/12
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/12
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation, pricing, API, and README pages all render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs