Bulk email list endpoint (100 emails) via x402 micropayment on Base network.
What it does
This x402-enabled endpoint at lowpaymentfee.com provides access to an email-related resource at the path `/api/v1/emails/100`. The endpoint accepts POST requests and is gated behind an x402 payment challenge, settling in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals).
The provider's landing page advertises a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific `/api/v1/emails/100` endpoint is not listed on the landing page, and no documentation, input schema, or example responses are available for it. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because there is no documentation describing what this endpoint actually returns — whether it generates, validates, or retrieves email addresses — its exact functionality remains unclear. The endpoint is confirmed live (returning a valid 402 challenge), but users should be aware that the lack of documentation makes it difficult to predict the response format or required request body.
Capabilities
Use cases
- —Purchasing a batch of email addresses or email-related data via a single API call
- —Integrating email data retrieval into automated agent workflows without API key management
- —Pay-per-use email operations settled in USDC on Base
Fit
Best for
- —Agents needing on-demand email data without subscription commitments
- —Developers experimenting with x402 payment-gated APIs
- —Workflows requiring crypto-settled, keyless API access
Not for
- —Production use cases requiring well-documented input/output schemas
- —Users who need free or fiat-only payment options
- —High-volume email operations where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/100 \
-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 zero documentation on what it does, what inputs it expects, or what it returns. The /api/v1/emails/100 path is not even listed on the provider's own landing page. No OpenAPI spec, no examples, and all doc pages are empty.
Warnings
- —The /api/v1/emails/100 endpoint is not listed on the provider's landing page — its purpose is unclear.
- —No documentation, input schema, or example responses are available for this endpoint.
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content.
- —The endpoint may involve email addresses, which could raise privacy or anti-spam concerns depending on the actual data returned.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/emails/100
- —The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/100
- —The /api/v1/emails/100 path is not listed among the provider's advertised API endpointshttps://lowpaymentfee.com