x402basequality 0.35

Pay-per-call BTC quote endpoint on Base via x402, $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/crypto/quotes/btc

What it does

This x402-enabled endpoint at lowpaymentfee.com provides Bitcoin (BTC) cryptocurrency quotes via a simple POST request. It is part of a broader suite of pay-per-call APIs covering finance, AI/ML, data analytics, and utility services, all priced at $0.02 per request and settled in USDC on the Base network.

The endpoint uses the x402 payment protocol: callers receive a 402 Payment Required challenge containing payment details (payTo address, asset contract, max amount). After settling the micro-payment on-chain, the caller includes the payment proof in an X-PAYMENT header to access the resource. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are needed — access is purely pay-per-use.

Documentation on the site 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 schema, no example request/response payloads, and no description of the response format beyond the stated MIME type of application/json. The specific fields returned in a BTC quote (e.g., price, volume, timestamp) are not documented and must be discovered by making a paid call.

Capabilities

btc-quotecrypto-price-datax402-paymentusdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Fetching real-time BTC price quotes for trading bots or portfolio trackers
  • —Integrating Bitcoin pricing data into agent workflows without API key management
  • —Pay-per-use crypto market data for low-volume or sporadic consumers

Fit

Best for

  • —Agents or bots that need on-demand BTC quotes without subscription overhead
  • —Developers prototyping crypto-aware applications with minimal setup
  • —x402-native workflows that settle micro-payments on Base

Not for

  • —High-frequency trading requiring sub-second latency and bulk pricing
  • —Users who need comprehensive multi-asset market data in a single call
  • —Anyone without a Base-compatible USDC wallet

Quick start

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

Endpoint

URLhttps://lowpaymentfee.com/api/v1/crypto/quotes/btc
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and all documentation pages return only a wallet-connect prompt. Effectively a stub listing with minimal verifiable detail about what the response contains.

Warnings

  • —No OpenAPI or schema documentation available — response format is unknown
  • —All doc/pricing/README pages render only 'Connect wallet' with no technical content
  • —No example request or response payloads available; output must be discovered via paid call
  • —The broader site lists many endpoints across diverse categories (AI, analytics, finance, utils) all at $0.02 — actual functionality behind each is unverified

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:08:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/MytgcU
Pay-per-call BTC quote endpoint on Base via x402, $0.02 per request in USDC. — Clawmart · Clawmart