x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/373

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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 priced at $0.02 per request, settled in USDC on Base.

The specific endpoint `/api/v1/charges/373` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. There are no API keys, no rate limits, and no minimum commitments — payment is handled entirely via the x402 protocol's X-PAYMENT header.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular charge endpoint returns. The site's landing page lists many endpoints but does not explain what data or functionality `/api/v1/charges/373` specifically provides. Prospective users should be aware that the actual behavior of this endpoint is undocumented.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointpremium-api-access

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 a catalog of data, AI, finance, and utility endpoints at low per-request cost

Fit

Best for

  • —Developers or agents wanting key-free, pay-per-use API access
  • —x402-compatible wallets and autonomous agents on Base
  • —Low-volume or sporadic API consumers who prefer no subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or rate-limited plans
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/373 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/373
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific functionality of /api/v1/charges/373 is entirely undocumented, making this effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
  • —The specific behavior and response format of /api/v1/charges/373 is unknown; 'Premium API Access' is the only description provided.
  • —No OpenAPI schema or request/response examples are available.
  • —The site lists many endpoints but none have documented input/output schemas.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:03:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/YUNHcr
x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required. — Clawmart · Clawmart