第 3 部分：`tokenprice`（$0.001）與現有價格數據服務比較：實測而非宣傳
Part 3: `tokenprice` ($0.001) vs the price-feed incumbents — measured, not marketed
`tokenprice`以每次$0.001提供基於DexScreener數據的即時代幣報價，價格是CoinMarketCap x402每次$0.01的十分之一。四項查詢的延遲中位數約1.8s；ticker 搜尋可能匹配其他鏈上的同名代幣，按地址查詢則精確。每月約30K次以下按次收費較省，超過約100K次則訂閲制較划算。
Part 3 of the x402 benchmark series. Part 1 covered the method and our baseline across 7 endpoints. Part 2 (websearch vs Exa vs Tavily) is still in the queue — we're waiting on API keys to run that head-to-head fairly, and we'd rather delay than fake it.
1. Why price feeds are the right fight
Every trading agent, portfolio tracker, and research bot needs the same primitive: "what is this token worth right now?" The incumbent answers are CoinGecko and CoinMarketCap — both excellent, both subscription-shaped. CoinGecko's paid plans start at $29–35/month for 100,000 calls (Analyst is $103–129/month for 500,000). CoinMarketCap's Builder is $29–35/month for 150,000 calls, Startup $79–95/month for 450,000.
Subscriptions punish experimentation. If your agent makes 200 price checks a day while you're still figuring out product-market fit, you're paying $29+/month for the privilege of learning. And here's the detail that makes this comparison interesting: CoinMarketCap itself now offers an x402 pay-per-call path — at $0.01 USDC per call, rate-limited to 30 req/min per wallet. So the per-call model isn't our invention; it's where the market is going. The question is just price and execution.
Our tokenprice endpoint charges $0.001 per call — one tenth of CMC's x402 price — backed by DexScreener data. Same method as Part 1: fixed queries, real latency, real output, no cherry-picking.
2. The measurements (2026-10-20, live)
Four queries, one 10-minute window, wall-clock latency including network. All via the public endpoint, paid x402 flow:
| Query | How | Price returned | Market cap | 24h vol | Liquidity | Latency |
|---|---|---|---|---|---|---|
| WETH | by address (ethereum) | $2,381.81 | $5.24B | $43.4M | $7.9M | 1.77s |
| USDC | by address (base) | $1.000053 | $72.4B | $2,037 | $127K | 1.79s |
| SOL | by ticker | $122.08 | $2.56B | $121 | $2.56B | 2.09s |
| ETH | by ticker | $1,773.17 | $1.73B | $107K | $1.73B | 1.81s |
Median latency: ~1.8s. Nothing here bottlenecks an agent loop.
3. The honest caveat (we're not hiding this)
Look at row 4. Real ETH is ~$2,381 (see the WETH row). The ticker query for "ETH" returned $1,773 — a different token on Solana (Raydium) that happens to share the ticker. Ticker search is inherently ambiguous; DexScreener matches by symbol across every chain, and the top match isn't always the one you meant.
This is a real limitation, not a footnote: if precision matters, query by {"chain", "address"} — the by-address rows are exact. We'd rather tell you this in a benchmark than have your agent buy the wrong "ETH". (We're considering making ticker queries return the top-3 candidates with chains instead of silently picking one — feedback welcome.)
4. The cost math at agent scale
| Workload | tokenprice ($0.001) | CMC x402 ($0.01) | CoinGecko Basic ($29/mo) |
|---|---|---|---|
| 1,000 calls | $1.00 | $10.00 | $29 (100K included) |
| 10,000 calls | $10.00 | $100.00 | $29 |
| 100,000 calls | $100.00 | $1,000.00 | $29–35 |
| 1,000,000 calls | $1,000.00 | $10,000.00 | $103–129 (Analyst) |
Read it straight: under ~30K calls/month, per-call wins. Past ~100K/month, the subscription wins — no surprise, that's how volume pricing works. The per-call model isn't "cheaper at every scale"; it's cheaper at experiment scale, which is exactly where agents live while their builders are still iterating. You don't buy a $29/month plan to find out whether your idea works.
Two more things the table doesn't show:
- No signup, no key. CoinGecko's free Demo tier (10K credits/month) carries no commercial license, and every paid tier means an API key your agent has to hold. With x402, the wallet is the credential — nothing to leak from context.
- What you're not getting. We don't do 10 years of historical candles, order books, or 10,000-coin coverage. If you need all-time history from 2010, buy the subscription — genuinely. We're a live-quote + DEX liquidity layer: price, market cap, 24h volume, liquidity, pair link. That's the whole product, and the price reflects it.
5. Try it yourself
Free trial, no signup — the trial quota applies automatically per IP:
curl -X POST https://api.mekongtradeintel.com/tokenprice/api/token-price \
-H "Content-Type: application/json" \
-d '{"chain":"base","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'
Watch for the X-Free-Remaining header. When the trial runs out you get a standard 402 with payment instructions — sign with any Base wallet and retry with X-PAYMENT. The full agent demo (tokenprice → aiverdict → websearch pipeline, ~$0.021/run) is here: https://github.com/judomanmk19xx-bot/x402-agent-demo
Pricing for all 43 endpoints: https://api.mekongtradeintel.com/pricing
Next in the series: Part 2, websearch vs Exa vs Tavily — the moment we have the keys. If you re-run these numbers and get something different, say so; a benchmark that can't survive reproduction is just an ad.
Pricing sources: CoinGecko/CoinMarketCap plan details via their published 2026 pricing (coinmarketcap.com academy & api resources, coinstats.app comparison, July–August 2026). CMC x402 path: 0.01 USDC/call per CMC's own API resources page.
來源：DEV Community · dev.to