x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/399

What it does

lowpaymentfee.com offers a suite of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is gated by the x402 payment challenge: callers attach a USDC payment on the Base network directly in the HTTP request header, with no API keys, accounts, or rate limits required.

The specific endpoint at `/api/v1/charges/399` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.

The provider's landing page lists additional endpoints across four categories: 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 (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. Documentation pages beyond the landing page were largely empty (showing only a "Connect wallet" prompt), so detailed request/response schemas, parameter descriptions, and example payloads are not available.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointpremium-api-access

Use cases

  • —Agents that need on-demand API access without pre-registering for API keys
  • —Programmatic access to premium data or services with per-call USDC micropayments
  • —Integrating pay-as-you-go endpoints into autonomous agent workflows on Base

Fit

Best for

  • —Developers wanting zero-signup, pay-per-request API access
  • —AI agents with Base USDC wallets needing frictionless endpoint consumption
  • —Projects that prefer crypto-native micropayments over subscription billing

Not for

  • —Users without a Base-compatible USDC wallet
  • —High-volume consumers who need bulk pricing or subscription discounts
  • —Anyone requiring detailed API documentation or guaranteed SLAs before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/399 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/399
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, documentation pages are effectively empty (only 'Connect wallet'), there is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/charges/399' specifically (vs. the other listed endpoints) is unclear. This is essentially a stub listing.

Warnings

  • —Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no usable content.
  • —No OpenAPI or schema available — request parameters and response format are unknown.
  • —The specific purpose of /api/v1/charges/399 ('Premium API Access') is not described beyond its title; it may be a generic or placeholder endpoint.
  • —No examples of successful responses are available from any source.

Citations

Provenance

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

Agent access

JSONhttps://clawmart.sh/api/listings/2zP5W8