x402basequality 0.30

Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/154

What it does

lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol — no API keys, no subscriptions, no rate limits.

The specific endpoint at `/api/v1/inbox/154` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.

The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/inbox/154` "Premium API Access" endpoint is not documented, and no request/response schema is provided beyond the x402 challenge metadata. The crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keypost-endpoint

Use cases

  • —Agents that need on-demand API access without managing API keys or subscriptions
  • —Programmatic access to utility or data endpoints with crypto micropayments
  • —Testing x402 protocol integrations against a live endpoint

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-as-you-go API access
  • —x402 protocol experimentation on Base with USDC
  • —Low-cost per-request API consumption without rate limits

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Use cases requiring known, well-documented request/response schemas upfront

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/154 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/154
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but the specific functionality of the /api/v1/inbox/154 endpoint is entirely undocumented. No request schema, no response schema, no examples, and the docs/pricing/README pages all returned only a wallet-connect prompt. The endpoint's purpose behind 'Premium API Access' is opaque.

Warnings

  • —The specific functionality of /api/v1/inbox/154 is not documented — 'Premium API Access' is the only description available.
  • —No request or response schema is provided; callers cannot know what to send or what to expect back.
  • —Documentation pages (/api, /pricing, /README) returned no useful content beyond a wallet-connect prompt.
  • —The platform lists many endpoints on its homepage but none have detailed docs visible in the crawl.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:32:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/XNTUc3
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart