x402basequality 0.30

Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/keys/48

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/keys/48` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.

The broader platform advertises multiple API 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 endpoints are listed at the same $0.02/request price point.

However, the specific functionality behind `/api/v1/keys/48` is not documented beyond the label "Premium API Access." There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is live and returns a valid x402 challenge, but what data or service it actually returns upon successful payment is unclear.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-response

Use cases

  • —Accessing premium API data without creating an account or managing API keys
  • —Agent-driven workflows that need on-demand API calls settled in USDC on Base
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers wanting zero-signup, pay-as-you-go API access
  • —AI agents with x402-compatible wallets on Base
  • —Prototyping x402 payment integrations

Not for

  • —Users who need detailed documentation or guaranteed SLAs before paying
  • —High-volume use cases where $0.02/request adds up without bulk discounts
  • —Anyone needing to understand exact response schemas before calling

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/48 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/48
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific purpose of /api/v1/keys/48 is unknown beyond its label.

Warnings

  • —No documentation available for what /api/v1/keys/48 actually returns upon successful payment
  • —No OpenAPI or schema definition found
  • —All non-homepage crawled pages returned only 'Connect wallet' with no useful content
  • —The endpoint label 'Premium API Access' is generic and does not describe functionality

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:21:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/x6UFFX
Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required. — Clawmart · Clawmart