x402basequality 0.30

x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/89

What it does

lowpaymentfee.com is an x402 protocol API provider offering a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/89` is listed as "Premium API Access" and accepts payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The provider's landing page advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure/Utility (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.

However, the specific `/api/v1/carts/89` endpoint does not clearly map to any of the advertised API categories. Its description is simply "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a valid 402 x402 challenge), but the actual behavior after payment is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyjson-response

Use cases

  • —Paying per-call for API access without managing API keys or subscriptions
  • —Integrating x402-compatible agents that settle payments in USDC on Base
  • —Accessing analytics, AI inference, finance data, or utility services on a pay-as-you-go basis

Fit

Best for

  • —Developers or agents wanting zero-commitment, per-request API billing
  • —x402-native AI agents that can autonomously pay for API calls
  • —Users who prefer crypto-settled micropayments over traditional billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or rate-limited plans
  • —Anyone unable to transact in USDC on the Base network

Quick start

# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Using curl as an example (you need an x402-compatible client to generate the header):
curl -X POST https://lowpaymentfee.com/api/v1/carts/89 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/89
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific /api/v1/carts/89 path does not correspond to any documented API category. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub listing.

Warnings

  • —The /api/v1/carts/89 endpoint does not match any of the advertised API categories on the landing page; its actual functionality is unknown.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no technical content.
  • —The actual response payload after successful payment is completely undocumented.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:00:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/Y6HyHv
x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC. — Clawmart · Clawmart