x402basequality 0.25

x402-gated card-transaction endpoint on Base, pay-per-call with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/18/transactions

What it does

This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/18/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme, and the endpoint accepts POST requests.

The broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint listed here (`/api/v1/cards/18/transactions`) is labeled "Premium API Access" and does not appear in the publicly listed catalog on the homepage. Its exact functionality — what data it returns or what action it performs on "card 18 transactions" — is not documented in any crawled page.

Because the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content, there is no schema documentation, request/response examples, or detailed description available for this endpoint. The endpoint is confirmed live (402 challenge captured), but its purpose and output format remain unclear.

Capabilities

x402-paymentusdc-basepay-per-callpost-endpointcard-transactions

Use cases

  • —Retrieving or submitting card transaction data via a single paid API call
  • —Integrating pay-per-use card transaction lookups into agent workflows
  • —Programmatic access to card-level transaction records without API key management

Fit

Best for

  • —Agents or services that need on-demand card transaction data with no subscription
  • —Developers experimenting with x402 payment-gated APIs on Base
  • —Use cases requiring keyless, pay-as-you-go API access

Not for

  • —Users who need detailed API documentation or guaranteed SLA before integrating
  • —High-volume batch processing where per-call pricing at $0.02 adds up quickly
  • —Anyone needing non-USDC or non-Base-network payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/18/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/18/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. The docs pages are empty (wallet-connect only). The endpoint path does not appear in the site's public catalog, making its purpose unclear.

Warnings

  • —No API documentation available — all doc pages render only a 'Connect wallet' prompt
  • —The endpoint /api/v1/cards/18/transactions is not listed in the site's public API catalog; its purpose is undocumented
  • —No request or response schema is available; integration requires trial-and-error
  • —The 'cards/18/transactions' path suggests financial data — verify regulatory compliance before use

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:46:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/bHdHnJ
x402-gated card-transaction endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart