x402-gated email data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides x402-protocol-gated API access to an email-related resource (specifically `/api/v1/emails/81`). It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The specific resource at `/api/v1/emails/81` is labeled "Premium API Access" in the x402 challenge but lacks detailed documentation about what data it returns. The endpoint is live and responds with a valid x402 version-1 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /README) all resolve to a minimal "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the `/api/v1/emails/81` resource actually returns. The email-specific nature of this endpoint is only inferable from the URL path; the platform's landing page does not list it among its advertised API categories.
Capabilities
Use cases
- —Retrieving email-related data behind a per-request paywall
- —Agent-driven data access without API key management
- —Programmatic access to premium email resources via x402 protocol
Fit
Best for
- —Agents or services that need keyless, pay-per-call email data access
- —Developers experimenting with x402 payment protocol on Base
- —Scenarios requiring low-cost, no-commitment API access
Not for
- —Users who need documented request/response schemas before integrating
- —High-volume email processing where per-request pricing adds up
- —Anyone needing detailed email service features (sending, SMTP, etc.) — the endpoint's actual capability is unclear
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/81 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/emails/81 resource actually provides. The docs, pricing, and README pages are all empty stubs. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, and /README pages all show only 'Connect wallet' with no content
- —The /api/v1/emails/81 endpoint is not listed among the platform's advertised APIs on the landing page
- —No OpenAPI schema or request/response examples exist; the actual data returned is unknown
- —The purpose of this specific endpoint (emails/81) is entirely unclear — it could be a test or placeholder resource
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/emails/81
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/emails/81
- —Documentation pages (/docs, /pricing, /README) resolve to minimal 'Connect wallet' contenthttps://lowpaymentfee.com/docs