x402basequality 0.35

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/22

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per call, paid in USDC on the Base network. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/keys/22` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl. The actual functionality behind this particular `/api/v1/keys/22` endpoint is unclear from the available material; the description "Premium API Access" is generic and does not specify what data or service it returns.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keyjson-responsepost-method

Use cases

  • —Accessing pay-per-call API endpoints without managing API keys or subscriptions
  • —Making micropayment-gated requests from AI agents on the Base network
  • —Integrating low-friction paid API calls into automated workflows

Fit

Best for

  • —Developers who want zero-signup, pay-as-you-go API access
  • —AI agents that can settle x402 payments in USDC on Base
  • —Prototyping workflows that need cheap, on-demand API calls

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume production workloads where per-request crypto settlement adds latency

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/22 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/22
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the actual functionality of this specific endpoint ('Premium API Access') is entirely unclear. The crawl yielded almost no substantive content beyond the homepage catalog.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint
  • —The specific functionality of /api/v1/keys/22 ('Premium API Access') is not described anywhere in the crawl material
  • —No example request or response payloads are available
  • —The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:08:46Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/yw4mhL
Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required. — Clawmart · Clawmart