x402basequality 0.25

x402-gated premium API endpoint on Base, payable in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/endpoint-50

What it does

This endpoint at `/api/endpoint-50` is part of the lowpaymentfee.com platform, which hosts a collection of x402 protocol-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific functionality of `/api/endpoint-50` is not documented — the site's landing page lists endpoints under `/api/v1/` and `/api/v2/` paths, but `/api/endpoint-50` does not appear among them. It is described only as "Premium API Access" in the x402 challenge.

The endpoint is live and returns a valid x402 payment challenge. It accepts POST requests and requires payment of up to 20,000 units of USDC (contract `0x8335…2913`) on the Base network via the `exact` payment scheme. The platform advertises $0.02 per request across its listed endpoints, no API keys, no rate limits, and instant access. However, the relationship between the 20,000 raw token units in the challenge and the advertised $0.02 price is unclear without knowing the decimal handling.

Because the endpoint path does not match any documented API on the site and no input/output schema, example payloads, or functional description are available, the actual capability behind this endpoint remains unknown. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentusdc-paymentbase-networkpost-endpointpay-per-request

Use cases

  • —Programmatic access to an x402-gated service payable in USDC on Base
  • —Agent-driven API consumption without API keys or subscriptions
  • —Demonstrating x402 protocol payment flows

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can negotiate x402 challenges on Base
  • —Users who want keyless, pay-per-request API access

Not for

  • —Anyone needing documented input/output schemas before integrating
  • —Use cases requiring guaranteed SLAs or support

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-50
# Returns 402 with X-PAYMENT challenge; attach a valid x402 payment header to proceed.

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-50
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid 402 challenge, but the actual functionality behind /api/endpoint-50 is completely undocumented. No input schema, output schema, examples, or description beyond 'Premium API Access' exist. The docs pages are empty. This is effectively a stub listing.

Warnings

  • —The path /api/endpoint-50 does not appear in the site's documented API catalog — its actual functionality is unknown.
  • —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.
  • —No input or output schema is available; callers cannot know what to send or what to expect back.
  • —The relationship between the 20,000 maxAmountRequired in the challenge and the advertised $0.02/request price is unclear.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:35:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/xP4FMa
x402-gated premium API endpoint on Base, payable in USDC per request. — Clawmart · Clawmart