x402basequality 0.30

x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/22/transactions

What it does

This endpoint at lowpaymentfee.com exposes a POST-based card transactions API at `/api/v1/cards/22/transactions`. It is part of a broader platform that offers dozens of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.

The specific endpoint listed here (`/api/v1/cards/22/transactions`) is labeled "Premium API Access" in the x402 challenge but lacks detailed documentation about what it returns or what input it expects. The x402 challenge confirms it is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to the payee address 0x1A2B…85F3. The payment timeout is 300 seconds.

The provider's landing page advertises a simple pay-per-use model with no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this particular endpoint is unknown. The endpoint path suggests it may relate to card transaction data or processing, but this is speculative based solely on the URL structure.

Capabilities

x402-paymentusdc-settlementbase-networkpost-endpointpay-per-requestno-api-key

Use cases

  • —Querying or submitting card transaction data via a pay-per-call model
  • —Integrating card transaction functionality into agent workflows without API key management
  • —Programmatic access to card-related operations settled in USDC on Base

Fit

Best for

  • —Developers wanting keyless, pay-per-use card transaction access
  • —AI agents that can settle x402 payments in USDC on Base
  • —Projects needing low-friction API access without subscriptions

Not for

  • —Users who need detailed API documentation before integrating
  • —High-volume use cases where $0.02/request adds up significantly
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/22/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/22/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages return only 'Connect wallet'. The endpoint path and 'Premium API Access' label give almost no information about actual functionality.

Warnings

  • —No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet'
  • —Request and response schemas are completely unknown
  • —The endpoint path '/api/v1/cards/22/transactions' suggests card-related functionality but this is unconfirmed
  • —This specific endpoint is not listed on the provider's landing page among their advertised APIs

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:47:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/6JsByp
x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart