x402basequality 0.35

x402-gated premium API access on Base, paid per-call in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/stripe/subscriptions/40

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is located at `/api/v1/stripe/subscriptions/40` and returns a valid 402 challenge when called without payment, confirming it is live. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 "exact" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.

The broader lowpaymentfee.com platform advertises a suite of APIs across data/analytics, AI/ML (sentiment analysis, 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 with no API keys, no rate limits, and no commitments. However, this specific endpoint's path (`/stripe/subscriptions/40`) suggests it may relate to a subscription or premium tier rather than one of the individually listed utility endpoints. The exact response payload and functionality of this particular endpoint are not documented in the crawled material.

Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable.

Capabilities

x402-paymentusdc-baseper-call-pricingno-api-keypremium-access

Use cases

  • —Programmatic access to premium API features paid per-call in USDC on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Integrating x402-compatible payment flows into automated pipelines

Fit

Best for

  • —Developers or agents with USDC on Base who want frictionless per-call API access
  • —Projects that prefer crypto micropayments over traditional API key subscriptions
  • —x402-native agent toolchains looking for low-cost endpoints

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/40
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.

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/stripe/subscriptions/40",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/40
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for this specific endpoint's functionality, no request/response schema, and all doc pages are empty. The endpoint path suggests a subscription resource but its actual behavior is unknown.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.
  • —The endpoint path '/api/v1/stripe/subscriptions/40' suggests a subscription-related resource, but its exact functionality and response schema are undocumented.
  • —No OpenAPI spec, no AI plugin manifest, and no agents.txt found.
  • —Cannot confirm what data or service is returned after successful payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 11:04:33Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/JfpGLV
x402-gated premium API access on Base, paid per-call in USDC. — Clawmart · Clawmart