x402basequality 0.35

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/benefits/7

What it does

lowpaymentfee.com is a pay-per-call API platform that gates its endpoints behind the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/benefits/7` is labeled "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises several categories of endpoints — 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 priced at $0.02 per request. However, this listing covers only the `/api/v1/benefits/7` endpoint, whose specific functionality beyond the generic "Premium API Access" label is not documented.

The endpoint is live and returns a well-formed x402 version 1 challenge. Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by this endpoint after successful payment is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypremium-api-access

Use cases

  • —Agents that need to call premium APIs without pre-registering for API keys
  • —Programmatic access to gated content or services via on-chain micropayments
  • —Demonstrating x402 protocol integration for pay-per-request workflows

Fit

Best for

  • —Developers experimenting with x402 protocol payments
  • —AI agents with USDC wallets on Base that need keyless API access
  • —Low-volume, on-demand API consumption without subscriptions

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume production workloads where $0.02/request adds up without bulk discounts
  • —Anyone who needs to know exactly what data the endpoint returns before paying

Quick start

# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/benefits/7
# Returns 402 with x402 payment challenge in JSON body.
# 2. Construct an X-PAYMENT header with a valid x402 proof paying
#    up to 0.02 USDC to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
#    on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).
curl -X POST https://lowpaymentfee.com/api/v1/benefits/7 \
  -H "X-PAYMENT: <x402-payment-proof>"

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/benefits/7",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/benefits/7
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what data it actually returns after payment. No OpenAPI spec, no request schema, no response examples, and the docs pages are empty. The listing is essentially a stub with only the payment parameters known.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.
  • —The actual response payload after successful payment is completely unknown.
  • —The specific purpose of /api/v1/benefits/7 ('Premium API Access') is not explained anywhere — it is unclear what data or service it provides.
  • —No OpenAPI spec or request/response schema is published.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 16:33:45Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/B5NLpK
x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits. — Clawmart · Clawmart