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/19` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — payment is handled inline via the x402 protocol's `X-PAYMENT` header.
The specific endpoint `/api/v1/emails/19` is listed under the generic title "Premium API Access." The crawled site does not enumerate an explicit "emails" category or document what this particular endpoint returns, so its exact functionality is unclear. It may return email-related data (e.g., a specific record or template identified by ID 19), but this is speculative. The x402 challenge confirms the endpoint is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (6 decimals → $0.02) per call, consistent with the site-wide $0.02 pricing.
The platform advertises additional API categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per-request price point. No OpenAPI schema, detailed documentation, or example responses were found during the crawl; the docs, pricing, and README pages all rendered only a "Connect wallet" prompt.
Capabilities
Use cases
- —Retrieving email-related data records on a per-request payment basis
- —Integrating pay-as-you-go email data into agent workflows without API key management
- —Programmatic access to email resources settled via on-chain USDC micropayments
Fit
Best for
- —Agents or developers who want keyless, pay-per-call access to email data
- —Workflows requiring on-chain payment settlement on Base L2
- —Low-volume or sporadic usage where subscription pricing is wasteful
Not for
- —High-volume email operations where per-call pricing becomes expensive
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/19 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of what the /api/v1/emails/19 endpoint actually returns, no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The endpoint's purpose must be guessed from its URL path alone.
Warnings
- —No documentation found for the /api/v1/emails/19 endpoint — its actual functionality is unknown
- —The docs, pricing, and README pages all render only 'Connect wallet' with no usable content
- —No OpenAPI or JSON schema is available to describe request/response formats
- —The 'emails/19' path suggests a specific record by ID, but this is unconfirmed
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/emails/19
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02https://lowpaymentfee.com/api/v1/emails/19
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com