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 29) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on Base.
The specific endpoint `/api/v1/emails/29/attachments` appears to serve attachment data for a particular email resource. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what request body to send or what the response structure looks like.
Capabilities
Use cases
- —Retrieving email attachments programmatically via micropayment
- —Integrating email data access into agent workflows without API key management
- —Paying per-request for on-demand email attachment retrieval
Fit
Best for
- —Agents needing one-off email attachment access without subscription
- —Developers exploring x402 micropayment-gated APIs
- —Workflows requiring keyless, pay-as-you-go data access
Not for
- —Bulk email processing requiring high throughput at low marginal cost
- —Users who need detailed API documentation and schema guarantees before integration
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/emails/29/attachments \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific email-attachments endpoint is unclear and may be a demo or placeholder. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages only show 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The endpoint path references a specific email ID (29), suggesting it may be a demo or placeholder rather than a general-purpose API
- —Purpose and expected request body for this email attachments endpoint are unknown
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/emails/29/attachments
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/emails/29/attachments
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs