x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/394

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 at `/api/v1/payments/394` is labeled "Premium API Access" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.

The site lists four categories of APIs: 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 (geocoding, validation, conversion, generation). However, the specific endpoint probed (`/api/v1/payments/394`) does not clearly map to any of these listed categories — it sits under a `/payments/` path not mentioned on the homepage.

The x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a max amount of 20,000 base units of USDC (6 decimals = $0.02). Payment settles on Base using the "exact" scheme with a 300-second timeout. No OpenAPI spec, detailed documentation, or example responses were found — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API endpoints without traditional API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven programmatic access to paid services via x402 protocol

Fit

Best for

  • —Developers who want keyless, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/394 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/394
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 example requests or responses, and the specific endpoint path (/api/v1/payments/394) doesn't match any of the advertised API categories. The docs/pricing/API pages are all empty beyond a wallet connect prompt.

Warnings

  • —The endpoint path /api/v1/payments/394 does not correspond to any API listed on the homepage — its actual functionality is unknown.
  • —No documentation, OpenAPI spec, or example responses are available anywhere on the site.
  • —All secondary pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.
  • —The actual behavior and output of this endpoint cannot be verified without making a paid request.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:24:25Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/kvBb9e
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart