Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).
What it does
This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 61) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (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, this specific endpoint is scoped to email attachment retrieval.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live via a valid 402 challenge, but the actual behavior, required POST body fields, and response structure are unknown.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Agent-driven email data extraction with per-request billing
- —Accessing stored email content without API key management
Fit
Best for
- —Agents needing on-demand email attachment access with crypto micropayments
- —Workflows that prefer pay-per-use over subscription-based email APIs
- —Developers building on Base network who want x402-native integrations
Not for
- —Bulk email processing (no documented batch support, $0.02 per request adds up)
- —Users without USDC on Base network
- —Anyone needing well-documented request/response schemas before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/61/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but there is zero documentation on request body format, response schema, or what email 61 actually contains. No OpenAPI spec, no examples, and all doc pages return only 'Connect wallet'. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet'
- —No OpenAPI or request/response schema provided; request body format is unknown
- —The endpoint is hardcoded to email ID 61 — unclear if other email IDs are accessible or what data this contains
- —Purpose and content of the email attachments endpoint is opaque; could contain arbitrary or placeholder data
Citations
- —Endpoint returns a valid x402 402 challenge with USDC on Base, maxAmountRequired 20000https://lowpaymentfee.com/api/v1/emails/61/attachments
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/emails/61/attachments
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Provider offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com