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/21

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/21` is labeled "Premium API Access" and requires a USDC payment on Base (asset 0x8335…2913) of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are needed — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com 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 utilities (geocoding, validation, conversion, generation). All are listed at $0.02 per request.

However, the specific `/api/v1/charges/21` endpoint's actual functionality is not documented beyond the label "Premium API Access." The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no further technical documentation, request/response schemas, or usage examples. Without knowing what this endpoint actually returns, callers should treat it as an opaque premium resource until more documentation surfaces.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyno-rate-limitjson-response

Use cases

  • —Programmatic access to a premium resource without API key management
  • —Agent-driven pay-per-call workflows settled in USDC on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment flows
  • —AI agents that need keyless, pay-as-you-go API access
  • —Users who want to avoid subscription commitments for occasional API calls

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/21 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/21
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.
  • —The actual functionality behind 'Premium API Access' at /api/v1/charges/21 is completely undocumented.
  • —No request or response schema is provided; callers cannot know what to send or what to expect back.
  • —No OpenAPI spec, ai-plugin manifest, or agents.txt discovered.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:32:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

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