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/52

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, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/charges/52` is labeled "Premium API Access" in the x402 challenge. The challenge confirms it accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the X-PAYMENT header on a POST request, and the endpoint returns application/json. The x402 version is 1 with a max timeout of 300 seconds.

Unfortunately, the crawled documentation, pricing, and API pages all returned only a "Connect wallet" prompt with no further content, so the actual functionality behind this specific charge endpoint is unclear. The landing page lists many sibling endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) but does not describe what `/api/v1/charges/52` specifically does. Without documentation or an OpenAPI schema, the exact input parameters and response format remain unknown.

Capabilities

x402-paymentusdc-base-settlementpay-per-requestjson-responseno-api-keyno-rate-limit

Use cases

  • —Accessing a pay-per-request API without needing API keys or subscriptions
  • —Programmatic agent-driven API consumption with on-chain USDC micropayments
  • —Testing x402 payment protocol integrations on Base

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto-native micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where per-request pricing may add up compared to flat-rate plans
  • —Users without access to USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/52 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/52
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/52 is undescribed. The docs/pricing/API pages all returned only 'Connect wallet' with no useful content.

Warnings

  • —The specific functionality of /api/v1/charges/52 ('Premium API Access') is not documented anywhere in the crawled material.
  • —All documentation, pricing, and API pages returned only a 'Connect wallet' prompt with no substantive content.
  • —No OpenAPI schema or input/output examples are available.
  • —The endpoint name 'charges/52' is generic and does not indicate what service it provides.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:01:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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