Retrieve email attachments via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 70) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or commitments required.
The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, 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 on Base. However, this specific listing covers only the `/api/v1/emails/70/attachments` endpoint.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual behavior, required request body fields, and response format are unknown.
Capabilities
Use cases
- —Programmatically retrieving email attachments behind a paywall
- —Agent-driven access to stored email data with per-request micropayments
- —Integrating email attachment retrieval into automated workflows without API key management
Fit
Best for
- —Agents needing on-demand email attachment access with no signup
- —Developers experimenting with x402 micropayment protocols
- —Workflows requiring pay-per-use email data retrieval on Base
Not for
- —Bulk email processing requiring high throughput at low marginal cost
- —Users who need detailed API documentation or guaranteed SLAs
- —Accessing emails other than ID 70 (endpoint is scoped to a single email)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/70/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint path suggests a very narrow scope (single email ID). The broader site offers many endpoints but none are documented beyond a name and price.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no technical content
- —No OpenAPI or schema specification found
- —Endpoint is scoped to a single email ID (70); unclear if other email IDs are available or what the attachment content contains
- —No request body schema or response schema documented — actual usage is unknown
- —The purpose and content of 'email 70 attachments' is entirely opaque
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000https://lowpaymentfee.com/api/v1/emails/70/attachments
- —All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com/api/v1/emails/70/attachments