x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/44

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or subscriptions required.

The specific endpoint at `/api/v1/inbox/44` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout window.

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/request price point. However, the specific functionality behind the `/api/v1/inbox/44` path is not documented beyond the generic "Premium API Access" label, so its exact behavior is unclear. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl.

Capabilities

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

Use cases

  • —Programmatic access to a pay-per-call API without managing API keys or subscriptions
  • —Agent-driven workflows that need on-demand API calls settled in USDC on Base
  • —Exploring x402 payment protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing low-friction, key-free API access
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Anyone requiring non-crypto payment methods
  • —High-volume use cases where per-request pricing may add up

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/44 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/44
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/inbox/44 actually does, no request/response schema, and no examples. The 'Premium API Access' label is entirely generic. Most crawled pages returned only 'Connect wallet' with no useful content.

Warnings

  • —The specific functionality of /api/v1/inbox/44 is undocumented — 'Premium API Access' is a generic label with no further detail.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').
  • —The broader site lists many endpoints but none match the /api/v1/inbox/44 path, raising questions about what this endpoint actually provides.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:18:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/zC8mM6
Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments. — Clawmart · Clawmart