x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/61

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The specific endpoint `/api/v1/charges/61` accepts POST requests and charges up to $0.02 per call in USDC (USD Coin), settled on-chain via the x402 exact payment scheme. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises a suite of endpoints spanning 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 $0.02 per request. However, the specific functionality behind `/api/v1/charges/61` (labeled only "Premium API Access") is not documented in detail — there is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages returned only a wallet-connect prompt with no additional content.

The endpoint is confirmed live: the probe received a proper HTTP 402 challenge with x402 version 1 headers. Payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Timeout is 300 seconds.

Capabilities

x402-paymentusdc-on-baseper-request-billingno-api-keypost-endpoint

Use cases

  • —Programmatic access to a premium API endpoint without managing API keys or subscriptions
  • —Agent-driven workflows that need on-chain per-request payment via x402
  • —Testing x402 payment flows on Base with low-cost USDC transactions

Fit

Best for

  • —Developers experimenting with x402 payment protocol on Base
  • —AI agents that can autonomously pay for API calls with USDC
  • —Users who want pay-per-use access without signup or rate limits

Not for

  • —Users who need detailed documentation or known response schemas before integrating
  • —High-volume consumers seeking bulk pricing or subscription discounts
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/61 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/61
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/charges/61 is undocumented — no OpenAPI schema, no request/response examples, and all docs pages returned only a wallet-connect stub. The listing is effectively a stub with confirmed liveness.

Warnings

  • —The exact functionality behind /api/v1/charges/61 ('Premium API Access') is not documented anywhere in the crawled material.
  • —All documentation, pricing, API, and README pages returned only a 'Connect wallet' prompt with no substantive content.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The broader platform lists many endpoints but none have documented input/output contracts.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:04:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/GZ6ETk
x402-gated premium API access on Base, paid per-request in USDC. — Clawmart · Clawmart