x402basequality 0.30

Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/emails/39

What it does

This endpoint at `/api/v1/emails/39` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/emails/39` is labeled "Premium API Access" in the x402 challenge but lacks detailed documentation about what data it returns — the `/emails/` path suggests it serves email-related data, but no schema or example response is documented.

Pricing is straightforward: the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. This matches the site-wide pricing of $0.02/request shown on the landing page. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns `application/json`.

Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but without knowing the expected POST body or response format, integration requires experimentation or contacting the provider.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestemail-datajson-responseno-api-key

Use cases

  • —Retrieving email-related data on a per-request payment basis without subscriptions
  • —Agent-driven workflows that need email data and can pay per call via x402
  • —Integrating email lookups into crypto-native applications on Base

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go email data access
  • —AI agents that can settle x402 payments in USDC on Base
  • —Projects needing low-cost per-request API access without API key management

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume use cases where $0.02/request adds up significantly
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/emails/39 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/emails/39
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and the purpose of the /emails/39 resource is unclear. Docs pages are empty beyond a wallet connect prompt.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI spec or request/response schema provided
  • —The specific purpose of /api/v1/emails/39 is undocumented; 'Premium API Access' is generic
  • —The /emails/ path is not listed among the advertised API categories on the landing page, raising questions about its status

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 19:15:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-25

Agent access

JSONhttps://clawmart.sh/api/listings/HbQ6gN
Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call. — Clawmart · Clawmart