x402basequality 0.30

Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/25

What it does

This endpoint at lowpaymentfee.com provides a pay-per-request email-related API accessible via the x402 payment protocol. The specific resource path `/api/v1/emails/25` suggests an email data retrieval or email-sending endpoint, though the exact functionality is not documented beyond the generic "Premium API Access" label. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals).

The provider operates a broader platform offering multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. The x402 challenge is live and returns a well-formed 402 response with scheme "exact" on Base. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each POST request.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/25` endpoint actually returns or expects as input. The endpoint is live but its exact behavior must be discovered empirically.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkemail-apino-api-keypost-method

Use cases

  • —Retrieving email data or metadata via a single paid API call
  • —Integrating email functionality into agent workflows without managing API keys
  • —Making one-off email API requests settled instantly in USDC on Base

Fit

Best for

  • —Agents needing keyless, pay-as-you-go email API access
  • —Developers who want to avoid subscription commitments for occasional email calls
  • —x402-compatible wallets and agent frameworks on Base

Not for

  • —High-volume email sending requiring bulk pricing or rate guarantees
  • —Users who need detailed API documentation or SLA commitments before integrating
  • —Non-crypto users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/25 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/25
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no documentation, no OpenAPI schema, no request/response examples, and no clear description of what the emails/25 endpoint does. The docs pages are all empty wallet-connect stubs. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
  • —Exact functionality of /api/v1/emails/25 is unknown; 'Premium API Access' is the only description
  • —No OpenAPI schema or request/response examples provided
  • —No information on what input the POST body should contain
  • —The '/25' path segment is unexplained — could be an email ID, a batch size, or something else

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:07:35Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Wy2EDv
Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required. — Clawmart · Clawmart