x402basequality 0.30

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/item/36

What it does

lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settling in USDC. The specific endpoint `/api/v1/item/36` is listed as "Premium API Access" and returns a standard x402 402 challenge when called without payment. The challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises endpoints across several categories: 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 utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the specific endpoint `/api/v1/item/36` does not clearly map to any of these named endpoints — it uses a generic item-ID path and the description is simply "Premium API Access" with no further documentation on what data or functionality it returns.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples of what this endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what payload to send or what response to expect.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Programmatic access to a premium API resource with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can settle USDC on Base for per-request access
  • —Use cases requiring no-signup, no-API-key access

Not for

  • —Users who need detailed documentation or guaranteed SLAs
  • —Applications requiring known, well-documented response schemas
  • —High-volume use cases where $0.02/request adds up without volume discounts

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/item/36 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/item/36
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 schema, and no indication of what /api/v1/item/36 actually returns. The generic 'Premium API Access' label and item-ID path provide no functional clarity.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema describing request parameters or response format for /api/v1/item/36
  • —The endpoint path '/api/v1/item/36' does not correspond to any of the named endpoints listed on the homepage — its actual functionality is unknown
  • —Response content and structure are completely undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 21:49:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/u8ubZm
x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request. — Clawmart · Clawmart