x402basequality 0.30

Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/133

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are settled on the Base network using USDC, with a flat price of $0.02 per request. The x402 protocol eliminates the need for API keys, accounts, or rate limits — callers simply attach a payment header to each request.

The specific endpoint at `/api/v1/payments/133` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. 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 extremely sparse: the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.

Capabilities

x402-paymentpay-per-requestbase-networkusdc-settlementno-api-keyjson-responsepost-method

Use cases

  • —Agents needing on-demand API access without pre-registration or API keys
  • —Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns
  • —AI agents that need keyless, instant API access
  • —Low-volume or sporadic API consumers who want no commitments

Not for

  • —High-volume production workloads needing documented SLAs and detailed schemas
  • —Users who need comprehensive API documentation before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/133 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/133
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The specific purpose of the /payments/133 'Premium API Access' endpoint is unclear — it could be a generic demo or a specific service. The docs, pricing, and README pages are all empty (just wallet-connect prompts). This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available
  • —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
  • —The specific function of /api/v1/payments/133 ('Premium API Access') is not documented — unclear what it returns
  • —No request body schema or response schema available
  • —No examples of successful responses found in crawled material

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:33:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/evg2L5
Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart