x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/23

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/charges/23` is labeled "Premium API Access" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. 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 broader platform offers endpoints across four 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 endpoints are listed at the same $0.02/request price point.

However, the specific endpoint `/api/v1/charges/23` does not clearly map to any of the named API categories on the site. Its description is simply "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or example payloads. Without more information, the actual behavior of this endpoint after payment remains unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyhttp-post

Use cases

  • —Programmatic access to paid API endpoints without traditional API key management
  • —Agent-driven workflows that need to pay per call using on-chain USDC
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless, pay-as-you-go API access
  • —Low-cost per-request API consumption on Base L2

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where per-request pricing may add up without bulk discounts
  • —Anyone needing clarity on what data this specific endpoint actually returns

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/23 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/23
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality of /api/v1/charges/23 is undescribed. The docs pages render only a wallet-connect prompt with no technical content.

Warnings

  • —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content
  • —The endpoint path /api/v1/charges/23 does not correspond to any named API on the site's landing page
  • —No OpenAPI schema, no example requests or responses, and no description of what the endpoint returns after payment
  • —Output behavior after successful payment is completely unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:30:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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