x402basequality 0.35

Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/162

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 call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.

The specific endpoint `/api/v1/inbox/162` is listed as "Premium API Access" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" payment scheme. The endpoint accepts HTTP 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 per request price point. However, the specific functionality behind the `/api/v1/inbox/162` path is not documented beyond the generic "Premium API Access" label, so its exact behavior is unclear.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keyjson-responsehttp-post

Use cases

  • —Accessing pay-per-request API services without needing API keys or subscriptions
  • —Making on-chain micropayments for individual API calls on Base
  • —Agent-driven workflows that need low-friction, per-call billing

Fit

Best for

  • —Developers wanting zero-commitment, per-request API billing
  • —AI agents that can settle x402 payments autonomously on Base
  • —Projects needing instant API access without signup or rate limits

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans
  • —Anyone who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/162 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/162
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality of /api/v1/inbox/162 is entirely undescribed beyond the generic label 'Premium API Access'. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content.

Warnings

  • —The exact functionality of /api/v1/inbox/162 is unknown — 'Premium API Access' is not a meaningful description of what the endpoint does or returns.
  • —No OpenAPI spec, no request/response schema, and no documentation pages were available.
  • —The broader site lists many endpoint categories but none match the /api/v1/inbox/162 path, raising questions about what this specific endpoint provides.
  • —Pricing and /README pages returned no content beyond 'Connect wallet'.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:37:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/qef57W
Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required. — Clawmart · Clawmart