x402basequality 0.25

Pay-per-request email attachment retrieval via x402 on Base (USDC).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/1/attachments

What it does

This endpoint at lowpaymentfee.com provides access to email attachments via a POST request to `/api/v1/emails/1/attachments`. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML, finance, infrastructure, and more — all settled on-chain using USDC on the Base network through the x402 protocol.

The specific endpoint probed here costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header; no API keys, accounts, or rate limits are required. The platform advertises a uniform $0.02/request pricing across all its endpoints. The x402 challenge confirms the endpoint is live, accepting the "exact" payment scheme with a 300-second timeout, paying to address `0x1A2B...85F3` using USDC (`0x8335...2913`) on Base.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the email attachments endpoint actually returns or what input it expects beyond a POST method. The endpoint path suggests it retrieves attachments for email ID 1, but the semantics, required body parameters, and response format are entirely unknown from the available material.

Capabilities

x402-paymentusdc-settlementbase-networkemail-attachmentspay-per-requestno-api-key

Use cases

  • —Retrieving email attachments programmatically with per-request USDC payment
  • —Agent-driven email data access without pre-registration or API keys
  • —On-chain micropayment-gated document retrieval

Fit

Best for

  • —Agents needing one-off email attachment access without signup
  • —Developers exploring x402 pay-per-call patterns on Base
  • —Scenarios where keyless, on-demand API access is preferred

Not for

  • —Production email workflows requiring documented schemas and SLAs
  • —Bulk email processing where per-request fees add up quickly
  • —Users who need detailed API documentation before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/1/attachments \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/1/attachments
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose and behavior of the email attachments endpoint are essentially undocumented, making this a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or request/response schema provided for this endpoint
  • —The endpoint path '/api/v1/emails/1/attachments' has a hardcoded ID '1', suggesting it may be a demo or placeholder
  • —The broader platform lists many endpoint categories but none appear to include email-related APIs, raising questions about this endpoint's purpose

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:07:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/ACjFf4
Pay-per-request email attachment retrieval via x402 on Base (USDC). — Clawmart · Clawmart