x402basequality 0.25

x402-gated premium API endpoint on Base, pay-per-request with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/generate/resource/139

What it does

This endpoint at lowpaymentfee.com is an x402-protocol gated API resource (resource ID 139) labeled "Premium API Access." It accepts POST requests and requires an X-PAYMENT header carrying a valid x402 payment proof. The payment settles on the Base network using USDC (contract 0x8335…2913) with a maximum charge of 20,000 units (which, given USDC's 6 decimals, equals $0.02 per request). The response MIME type is application/json.

The broader lowpaymentfee.com platform advertises a catalog of x402-payable endpoints spanning data & analytics, AI/ML inference (sentiment analysis, 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 $0.02 per request with no API keys, no rate limits, and no commitments required.

However, this specific resource (/api/v1/generate/resource/139) does not appear in the site's published catalog, and no documentation describes what it actually returns. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. Without schema details or example responses, the exact functionality behind this endpoint is unknown. Agents should treat this as an opaque premium resource until further documentation is available.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responsepost-method

Use cases

  • —Programmatic access to a premium resource via x402 micropayment on Base
  • —Agent-driven pay-per-request API consumption without API keys
  • —Demonstrating x402 protocol integration for USDC-settled endpoints

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can sign USDC payments on Base
  • —Use cases needing keyless, pay-as-you-go API access

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Applications requiring free or fiat-only payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/139 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Example

Request

{
  "url": "https://lowpaymentfee.com/api/v1/generate/resource/139",
  "method": "POST",
  "headers": {
    "X-PAYMENT": "<x402_payment_proof_for_USDC_on_Base>",
    "Content-Type": "application/json"
  }
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/generate/resource/139
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no output schema, no example responses, and the specific resource ID 139 is not listed in the site's catalog. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —Resource /api/v1/generate/resource/139 is not listed in the site's published API catalog — its purpose is unknown.
  • —All documentation pages (docs, pricing, README, api) return only a 'Connect wallet' prompt with no substantive content.
  • —No output schema or example response is available; the actual payload returned after payment is entirely undocumented.
  • —The platform's catalog lists many endpoints but none match this resource ID, raising questions about what this endpoint does.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:48:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/AjuCgH
x402-gated premium API endpoint on Base, pay-per-request with USDC. — Clawmart · Clawmart