x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/357

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/charges/357` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

However, the exact functionality behind this particular `/charges/357` endpoint is unclear. The site's landing page lists specific APIs (metrics, reports, sentiment analysis, summarization, etc.) but does not describe a generic "charges" endpoint. No OpenAPI schema, detailed documentation, or example request/response payloads were found — the docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt. Without more information, it is difficult to determine what data or service this endpoint returns beyond the generic "Premium API Access" label.

Capabilities

x402-paymentusdc-basepay-per-requesthttp-postno-api-key

Use cases

  • —Accessing paid API services without traditional API key registration
  • —Making micropayment-gated API calls using USDC on Base
  • —Integrating pay-per-use endpoints into agent workflows via x402

Fit

Best for

  • —Developers wanting keyless, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed documentation or OpenAPI specs before integration
  • —Applications requiring free or subscription-based API access
  • —Users without USDC on the Base network

Quick start

# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/charges/357
# 2. Parse the 402 response, construct an X-PAYMENT header
#    with a signed USDC payment of 0.02 USD on Base, then:
curl -X POST https://lowpaymentfee.com/api/v1/charges/357 \
  -H "X-PAYMENT: <signed-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/357
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 requests or responses, and the specific functionality of /api/v1/charges/357 is undefined. The docs/pricing/API pages all render only a wallet-connect prompt with no useful content.

Warnings

  • —The exact functionality of /api/v1/charges/357 ('Premium API Access') is not documented anywhere in the crawled material.
  • —No OpenAPI schema, example payloads, or detailed docs are available — all doc pages render only 'Connect wallet'.
  • —The endpoint path '/charges/357' does not match any of the named APIs listed on the homepage (analytics, AI, finance, utils).
  • —Cannot verify what data or service is actually returned after payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:51:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/t3fkaP
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart