x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/50

What it does

This endpoint at lowpaymentfee.com provides a premium email-related API accessible via the x402 payment protocol. The specific path `/api/v1/emails/50` suggests an email service endpoint (possibly batch or lookup for 50 records), though the exact functionality is not documented beyond the generic "Premium API Access" label. Payment is settled on the Base network using USDC at $0.02 per request.

The provider operates a broader platform offering multiple API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments — payment is handled entirely through the x402 protocol's X-PAYMENT header.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with USDC on Base (contract 0x8335…2913). The maxAmountRequired of 20000 base units equals $0.02 (USDC uses 6 decimals). Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the exact request/response schema for this email endpoint is unknown.

Capabilities

x402-paymentemail-apiusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Programmatic email operations paid per-call without subscription or API key management
  • —Agent-driven email workflows where payment is handled inline via x402
  • —Integrating email functionality into Web3 or crypto-native applications

Fit

Best for

  • —Developers wanting zero-signup, pay-as-you-go email API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Low-volume or sporadic email API usage where subscriptions are wasteful

Not for

  • —High-volume email sending requiring bulk pricing or dedicated infrastructure
  • —Users who need detailed API documentation and schema guarantees before integrating
  • —Non-crypto users without access to USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/50 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/50
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this email endpoint actually does, what request body it expects, or what it returns. All doc/pricing/API pages are blank beyond a 'Connect wallet' prompt. The exact functionality of /api/v1/emails/50 is unknown.

Warnings

  • —No documentation available — all sub-pages (docs, api, pricing, README) render only 'Connect wallet' with no content.
  • —The exact purpose and schema of /api/v1/emails/50 is undocumented; 'Premium API Access' is the only description provided.
  • —No OpenAPI spec, no request/response examples, and no error handling documentation exist.
  • —The '/50' path segment purpose is unclear — could be a batch size, record ID, or route parameter.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:04:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/c6N57u
Pay-per-call email API on Base via x402 — $0.02/request in USDC, no API keys required. — Clawmart · Clawmart