x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/endpoint-49

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-49`) is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — 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 listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-49`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.

The endpoint is live and returns a well-formed x402 challenge (version 1, scheme "exact"). Documentation beyond the landing page is effectively empty — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. Without an OpenAPI spec, request/response examples, or detailed documentation, the actual input format and output data of this endpoint remain unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyhttp-post

Use cases

  • —Agent-driven API consumption with automatic per-call USDC payments
  • —Accessing premium data or services without managing API keys or subscriptions
  • —Programmatic pay-as-you-go access to utility endpoints on Base

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-use API access
  • —x402-compatible clients settling micropayments in USDC on Base
  • —Use cases where avoiding API key management and rate limits is valuable

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume consumers who need bulk/subscription pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-49 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-49
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation, no request/response examples, and the endpoint path does not match any named service on the landing page. The actual functionality of /api/endpoint-49 is unknown.

Warnings

  • —Endpoint path /api/endpoint-49 does not match any named endpoint on the provider's landing page — its actual functionality is unclear.
  • —Documentation pages (docs, API, pricing, README) are effectively empty, showing only 'Connect wallet'.
  • —No OpenAPI schema or request/response examples are available.
  • —No way to verify what data or service this endpoint actually provides before paying.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:33:10Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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