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/133

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/133` is listed as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 protocol's X-PAYMENT header.

The platform advertises 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point with no rate limits or minimum commitments.

The specific `/api/v1/inbox/133` endpoint does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or usage examples are available beyond the x402 challenge. The endpoint accepts POST requests and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keypost-method

Use cases

  • —Programmatic access to utility or data endpoints without needing API keys or subscriptions
  • —Agent-driven workflows that need to pay per call with USDC on Base
  • —Exploring x402 protocol integration for pay-as-you-go API consumption

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-request API access
  • —x402-compatible clients on the Base network
  • —Low-cost, low-friction API calls settled in USDC

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without USDC on Base or an x402-compatible payment client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/133 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/133
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and payment details, but the specific endpoint '/api/v1/inbox/133' has no documentation, no request/response schema, and its purpose ('Premium API Access') is vague and doesn't match any named API on the landing page. No OpenAPI spec, no examples, and crawled docs pages returned only 'Connect wallet' with no content.

Warnings

  • —The endpoint path /api/v1/inbox/133 does not correspond to any documented API on the landing page — its actual functionality is unknown.
  • —No request body schema or response schema is documented; callers must guess what to send.
  • —Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.
  • —The platform lists many endpoint categories but provides no detailed docs for any of them.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:33:51Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/4ZqhVz
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart