x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/6

What it does

This endpoint at `/api/v1/carts/6` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. The specific `/api/v1/carts/6` resource is labeled "Premium API Access" but its exact functionality is not documented beyond that label. 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 request is 20,000 units (in USDC's 6-decimal representation, this equals $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The response MIME type is `application/json` and the endpoint accepts HTTP POST.

The broader lowpaymentfee.com platform lists 16+ endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02/request price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable.

Capabilities

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

Use cases

  • —Accessing premium data or services with per-request USDC micropayments on Base
  • —Integrating x402-compatible payment flows into agent workflows
  • —Testing x402 protocol payment challenges against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 pay-per-request protocols
  • —Agents that can settle USDC payments on Base L2
  • —Use cases requiring keyless, no-signup API access

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —Applications requiring non-crypto payment methods
  • —High-volume use cases where per-request pricing is cost-prohibitive

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/6 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/6
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific resource '/api/v1/carts/6' has no documented purpose beyond the generic label 'Premium API Access'. All documentation pages returned only 'Connect wallet' with no schemas, examples, or parameter descriptions. The listing is effectively a stub.

Warnings

  • —The exact functionality of /api/v1/carts/6 is unknown — 'Premium API Access' is the only description available.
  • —All documentation pages (/docs, /pricing, /README, /api) returned no substantive content, only a 'Connect wallet' prompt.
  • —No request or response schema is available; callers cannot determine what parameters to send or what data to expect.
  • —The platform lists many endpoints but none appear to have public documentation beyond titles and prices.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:52:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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