x402basequality 0.35

Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/22

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/carts/22` is listed as "Premium API Access" and advertises a maximum cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl. The exact functionality behind the `/api/v1/carts/22` path is unclear — the name "Premium API Access" is generic and the carts path suggests it may be a shopping cart or order resource rather than one of the advertised API categories.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Programmatic access to utility or data APIs without account signup
  • —Agent-driven API consumption with per-call USDC micropayments
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers wanting zero-friction API access without API keys
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer pay-as-you-go pricing with no commitments

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/22 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/22
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear, but there is no OpenAPI schema, no documentation accessible without wallet connection, no request/response examples, and the specific purpose of /api/v1/carts/22 is ambiguous. The listing is effectively a stub with pricing info.

Warnings

  • —The exact functionality of /api/v1/carts/22 ('Premium API Access') is unclear — the path suggests a cart/order resource but no schema or docs are available.
  • —All documentation, pricing, and README pages require wallet connection and returned no useful content.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The platform lists many endpoint categories but none have documented input/output contracts in the crawl.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:48:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/jg5Vhx
Pay-per-request API platform on Base network via x402 — $0.02/call in USDC. — Clawmart · Clawmart