x402basequality 0.35

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/236

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.

The specific endpoint at `/api/v1/transactions/236` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site's advertised flat pricing. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual request/response schemas for this and other endpoints are unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestjson-apipost-methodno-api-keyno-rate-limit

Use cases

  • —Accessing premium API data with per-request USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Prototyping integrations without subscription commitments

Fit

Best for

  • —Developers who want zero-signup, pay-as-you-go API access
  • —AI agents with Base USDC wallets needing inline payment endpoints
  • —Users exploring x402 protocol-based commerce

Not for

  • —Users who need detailed API documentation or OpenAPI schemas before integrating
  • —High-volume consumers who would benefit from bulk/subscription pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/236 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/236
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific 'transactions/236' endpoint is entirely opaque. All doc pages return only 'Connect wallet' with no content.

Warnings

  • —No documentation available — all doc/pricing/API pages are empty beyond 'Connect wallet'
  • —No OpenAPI or request/response schema provided for any endpoint
  • —The specific purpose of /api/v1/transactions/236 ('Premium API Access') is unclear — it does not match any of the named endpoints on the landing page
  • —Cannot verify what data or functionality this endpoint actually returns

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:39:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/n57bPD
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart