x402basequality 0.25

x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/84

What it does

This endpoint at `/api/v1/cards/84` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/cards/84` is labeled "Premium API Access" but its exact functionality is not documented beyond that label. The endpoint is live and returns a standard x402 payment challenge.

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

Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/cards/84` resource actually returns. The `/cards/84` path does not appear in the site's listed API catalog, making it unclear whether this is a card-data endpoint, a content endpoint, or something else entirely. Prospective users should be aware that the actual payload and behavior of this specific endpoint are undocumented.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responsehttp-post

Use cases

  • —Programmatic access to a premium API resource via x402 micropayment
  • —Agent-driven pay-per-call workflows without API key management
  • —Demonstrating x402 protocol integration on Base network

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing keyless, pay-per-request API access on Base
  • —Low-friction micropayment API consumption

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume batch processing where per-request fees add up
  • —Anyone needing to understand the exact response schema before paying

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/84 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/84
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /cards/84 resource is not listed in the site's own API catalog. The actual functionality is unknown.

Warnings

  • —The /cards/84 path is not listed among the provider's documented API endpoints — its purpose is unclear.
  • —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.
  • —No OpenAPI spec, no request body schema, and no response schema are available.
  • —The exact data or service returned by this endpoint is undocumented and cannot be verified without paying.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:02:49Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/NcJTea
x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request. — Clawmart · Clawmart