x402basequality 0.30

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/386

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/386` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request.

However, the specific functionality behind `/api/v1/transactions/386` is not documented beyond the label "Premium API Access." The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform. Prospective callers should be aware that the actual response payload and behavior of this endpoint are unknown from publicly available information.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyno-rate-limitjson-response

Use cases

  • —Accessing a premium API endpoint with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without API key management
  • —Testing x402 protocol payment flows against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, pay-per-call API access on Base
  • —Low-volume consumers who want no subscription commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume production workloads where $0.02/request adds up without bulk discounts
  • —Anyone who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/386 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/386
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The actual functionality behind 'Premium API Access' at this specific path is entirely undocumented.

Warnings

  • —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.
  • —The specific behavior and response schema of /api/v1/transactions/386 ('Premium API Access') is unknown.
  • —No OpenAPI or machine-readable schema is provided.
  • —The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:30:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/3ByMGT
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart