Pay-per-call email data endpoint on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at `/api/v1/emails/91` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific resource at `/emails/91` is labeled "Premium API Access" but its exact functionality is unclear — the path suggests it returns email-related data for a specific record (ID 91), but no documentation, schema, or example responses are available to confirm what it actually returns.
The endpoint is live and responds with a valid x402 challenge. Payment is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-call USDC micropayments.
The broader lowpaymentfee.com platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request. However, documentation pages (/docs, /pricing, /api, /README) all render only a "Connect wallet" prompt with no substantive content, making it impossible to verify what data or functionality any of these endpoints actually provide.
Capabilities
Use cases
- —Retrieving email-related data records via micropayment
- —Agent-driven data access without API key management
- —On-chain settled API calls for email information
Fit
Best for
- —Agents that need keyless, pay-per-call API access
- —Developers experimenting with x402 micropayment protocols
- —Use cases requiring on-chain payment receipts for API calls
Not for
- —Production workloads requiring documented response schemas and SLAs
- —Bulk email operations or email sending
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no response schema, no example payloads, and the docs/pricing/README pages are all empty stubs. The purpose of the /emails/91 endpoint is unclear, making this effectively a stub listing.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no content
- —The exact data returned by /api/v1/emails/91 is unknown; no output schema or examples exist
- —The endpoint path suggests a single fixed record (ID 91) rather than a parameterized query
- —Provider legitimacy and data quality cannot be verified from available materials
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/emails/91
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/91
- —Documentation pages (/docs, /pricing, /api, /README) contain no substantive contenthttps://lowpaymentfee.com/docs