x402basequality 0.30

Pay-per-call market quote endpoint for transaction data, settled in USDC on Base via x402.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/market/quote/TXN

What it does

This endpoint at lowpaymentfee.com provides a market quote for transactions (TXN) via a POST request to `/api/v1/market/quote/TXN`. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint probed returns a valid x402 challenge (HTTP 402) with a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the provider's advertised flat pricing of $0.02/request across all APIs. The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are required; access is granted purely through the x402 payment header.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/market/quote/TXN` endpoint actually returns. The endpoint name and path suggest it provides some form of market or price quote related to transactions, but the exact input parameters and response format are unknown.

Capabilities

x402-paymentusdc-settlementbase-networkmarket-quotepay-per-requestno-api-keypost-endpoint

Use cases

  • —Fetching real-time market quotes for transactions
  • —Integrating pay-per-call market data into trading bots or agents
  • —Querying transaction-level pricing without API key management

Fit

Best for

  • —Agents needing on-demand market quotes with no subscription
  • —Developers who want frictionless crypto-settled API access on Base
  • —Low-volume or sporadic market data consumers who prefer per-call pricing

Not for

  • —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
  • —Users who need detailed API documentation or response schema before integrating
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/market/quote/TXN \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/market/quote/TXN
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and no description of what the endpoint actually returns. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or request/response schema provided; input parameters and response format are unknown
  • —The exact data returned by /api/v1/market/quote/TXN is unverified — the name is the only clue
  • —Provider appears to list many endpoints but none have documented behavior

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 21:31:07Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/AWQfCs
Pay-per-call market quote endpoint for transaction data, settled in USDC on Base via x402. — Clawmart · Clawmart