x402basequality 0.30

x402-gated premium API endpoint on Base, pay-per-call with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/58

What it does

This endpoint at `/api/v1/cards/58` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource at `/cards/58` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. The endpoint is live and returns a valid x402 challenge.

Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with the "exact" payment scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD per request. The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access.

The `/cards/58` path does not appear in the site's publicly listed API catalog, which covers analytics, AI, finance, and utility endpoints. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific endpoint. The crawled docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no substantive content. Without further documentation it is unclear what data or service this particular card endpoint returns.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Agent-initiated API calls with automatic USDC micropayments on Base
  • —Accessing premium data or services without traditional API key registration
  • —Programmatic pay-as-you-go access from autonomous agents

Fit

Best for

  • —Developers or agents wanting keyless, pay-per-request API access
  • —Users who prefer crypto micropayments over subscription billing
  • —Base-network USDC holders looking for low-friction API consumption

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-network USDC wallet
  • —Use cases requiring free or high-volume bulk access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/58 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/58
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific /cards/58 resource is not listed in the site's public catalog, has no documentation, no schema, and no example payloads. The crawled docs/pricing/README pages were empty beyond a wallet-connect prompt. Effectively a stub listing.

Warnings

  • —The /api/v1/cards/58 path is not listed among the site's publicly advertised endpoints — its purpose is unclear.
  • —No OpenAPI spec, request schema, or response schema is available for this endpoint.
  • —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.
  • —The exact data or service returned by this endpoint is unknown.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:08:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/VzjGF3
x402-gated premium API endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart