x402basequality 0.40

x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/policies/69

What it does

lowpaymentfee.com is a pay-per-call API platform that gates its endpoints behind the x402 protocol on the Base network. The specific endpoint `/api/v1/policies/69` is listed as "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.

The broader 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 priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, instant access, and settlement on the Base network.

However, the specific endpoint `/api/v1/policies/69` does not clearly map to any of the advertised API categories — it sits under a `/policies/` path that is not documented on the landing page. There is no OpenAPI schema, no detailed documentation beyond the landing page listing, and the docs/pricing/README pages all returned only a "Connect wallet" prompt with no further content. The actual request format and response schema for this endpoint are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-responsepremium-api

Use cases

  • —Programmatic access to a premium API resource without managing API keys or subscriptions
  • —Agent-driven workflows that need to pay per call using USDC on Base
  • —Testing x402 payment flows against a low-cost live endpoint

Fit

Best for

  • —Developers exploring x402 protocol integration
  • —AI agents that can settle micropayments on Base in USDC
  • —Use cases requiring keyless, pay-as-you-go API access

Not for

  • —Users who need detailed documentation or OpenAPI specs before integrating
  • —Applications requiring free or subscription-based API access
  • —Anyone needing to know the exact response schema before committing payment

Quick start

# 1. Send a POST to discover the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/policies/69
# Returns 402 with x402 payment challenge in JSON body.
# 2. Construct an X-PAYMENT header per x402 spec,
#    paying 20000 base-units USDC on Base to 0x1A2B...85F3,
#    then re-send the POST with the header attached.

Example

Response

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://lowpaymentfee.com/api/v1/policies/69",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/policies/69
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation for the /policies/69 path specifically, no request/response examples for a successful (paid) call, and the docs pages are empty. The endpoint's actual functionality is unknown beyond its title.

Warnings

  • —The /api/v1/policies/69 path is not listed among the advertised APIs on the landing page — its purpose is unclear.
  • —No OpenAPI or schema documentation is available; request body format and successful response structure are unknown.
  • —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.
  • —The actual data or service returned after successful payment is undocumented.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:03:23Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/WJzWsY
x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits. — Clawmart · Clawmart