x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/227

What it does

lowpaymentfee.com is a platform offering a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/227` is labeled "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.

The broader platform advertises 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.

This particular endpoint (`/api/v1/charges/227`) does not have detailed documentation explaining what data or functionality it returns. The crawled docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content. The endpoint is confirmed live via a valid x402 402 challenge, but the lack of schema, examples, or documentation for what the response payload contains limits confidence in what callers will actually receive.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Agents needing on-demand API access without pre-registration or API keys
  • —Programmatic pay-per-call access to data, AI, finance, or utility endpoints
  • —Testing x402 payment flows on Base with low-cost USDC transactions

Fit

Best for

  • —Developers exploring x402 protocol integrations
  • —AI agents that need keyless, pay-as-you-go API access
  • —Low-volume consumers who want to avoid subscription commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume production workloads where $0.02/request adds up without bulk discounts

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/227 \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/227
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The specific functionality of /api/v1/charges/227 is entirely opaque.

Warnings

  • —No documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.
  • —The specific endpoint /api/v1/charges/227 has no description of what it returns beyond the label 'Premium API Access'.
  • —No OpenAPI schema, no input/output examples, and no error documentation provided.
  • —The platform lists many endpoint categories (AI, finance, data, infrastructure) but none are documented in detail.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:37:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/NfFx5D
x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys. — Clawmart · Clawmart