x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/49/transactions

What it does

This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/49/transactions` behind an x402 payment challenge. It accepts HTTP POST requests and settles payments in USDC on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform lists numerous pay-per-call APIs across categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints are advertised at $0.02 per request with the same x402 payment model on Base.

However, the specific endpoint being listed here — `/api/v1/cards/49/transactions` — is labeled only as "Premium API Access" with no further documentation about its request schema, expected input fields, or response format. The docs, pricing, and API pages on the site returned only a "Connect wallet" prompt with no additional content. Without documentation or example payloads, the exact functionality of this card-transactions endpoint remains unclear.

Capabilities

x402-paymentusdc-settlementbase-networkhttp-postpay-per-callcard-transactions

Use cases

  • —Retrieving transaction data for a specific card via a pay-per-call model
  • —Programmatic access to card transaction records without API key management
  • —Agent-driven financial data retrieval settled in USDC on Base

Fit

Best for

  • —Developers wanting keyless, pay-per-call access to card transaction data
  • —AI agents that can settle x402 payments in USDC on Base
  • —Use cases requiring no subscription or rate-limit constraints

Not for

  • —Users needing detailed API documentation or schema guarantees before integration
  • —High-volume batch processing where per-call pricing may add up
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/49/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/49/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/request in USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'cards/49/transactions' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content
  • —No request or response schema provided; the purpose of '/api/v1/cards/49/transactions' is unclear
  • —The endpoint path references a specific card ID (49), which may indicate a demo or placeholder resource
  • —No OpenAPI spec, no examples, and no description beyond the generic 'Premium API Access' label

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:52:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/42u7uY
x402-gated card-transactions endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart