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/accounts/51

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/accounts/51` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 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 are listed at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/accounts/51` endpoint, whose exact functionality beyond "Premium API Access" is not documented.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium data or services with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without managing API keys
  • —Testing x402 protocol payment flows against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol integrations
  • —Agents that need keyless, pay-per-call API access on Base
  • —Low-volume consumers who prefer micropayments over subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume production workloads requiring well-documented schemas and error handling
  • —Anyone without a Base-compatible USDC wallet

Quick start

# The endpoint returns 402 with an x402 challenge.
# Attach a valid X-PAYMENT header (x402 v1) to pay $0.02 USDC on Base.
curl -X POST https://lowpaymentfee.com/api/v1/accounts/51 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/51
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid 402 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of this specific endpoint is completely undocumented. The docs pages are empty beyond a wallet-connect prompt.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
  • —No OpenAPI or schema specification found; request and response formats are unknown.
  • —The exact functionality of /api/v1/accounts/51 ('Premium API Access') is not described anywhere.
  • —Cannot verify what data or service is returned upon successful payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:31:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/xYn6qj
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart