TrueVIN — One VIN. One price. One API.

Prompts you can ask your agent

Used car pricing, answered from one API

4 pricing sources

280M+ VINs

$0.05 per lookup

Edmunds · KBB · CarsXE · CarGurus · NHTSA

Day-to-day

How an agent chains this with other services

One prompt, multiple tool calls, one answer. TrueVIN is one block in a broader agent flow.

Prompt

"Is this Craigslist car a good deal? VIN 1HGBH41JXMN109186, asking $26,500 in Austin TX. Email me a summary."

Agent plan · 3 steps

1

Call truevin.dev/vin/1HGBH41JXMN109186?zip=78701&list_price=26500 → FMV $24,850 · Deal score 5.2 "Fair Deal" · $1,650 above market

2

Call truevin.dev/vin/1HGBH41JXMN109186/history → price falling 3% over 90 days, direction: falling

3

Call stableemail.dev/send → compose and deliver negotiation summary to user inbox

Email sent · 28 seconds after prompt

Delivered to user inbox

"This 2021 Toyota Camry LE is priced $1,650 above the Austin market average of $24,850. The trend is falling — prices have dropped 3% in 90 days. You could negotiate to $24,000–$24,500, or wait a few weeks as prices continue to soften."

Mix and match with any x402-paid service. Directory: x402scan · AgentCash

Get started

1

Set up AgentCash

Creates a wallet and shows your USDC deposit address — fund with at least $0.25 before the next step.

$ npx agentcash onboard

2

Make a test call

Hits the live valuation endpoint for $0.05 and prints the response — confirms your wallet pays end-to-end.

$ npx agentcash try https://truevin.dev

3

Add to your agent

Registers TrueVIN in your agent's config so it pays automatically on every call.

$ npx agentcash add https://truevin.dev

1

Paste into your AI assistant

Privy's skill agent sets up a wallet and handles x402 payments automatically — no CLI needed.

Setup prompt

Set up https://agents.privy.io/skill.md

2

Then ask about any car

Privy handles payment automatically — just ask naturally.

Example prompt

What's VIN 1HGBH41JXMN109186 worth? Use https://truevin.dev

1

Set up a Tempo Wallet

Tempo handles MPP payments — fund with USDC before making your first call.

Setup prompt

Read https://tempo.xyz/SKILL.md and set up a Tempo Wallet. Fund it with USDC.

2

Call TrueVIN

TrueVIN accepts MPP payments — Tempo handles authorization automatically.

GET https://truevin.dev/vin/{vin}?zip=&mileage=

Endpoints

Four endpoints. One normalized schema.

All responses are JSON. Prices in USD, settled in USDC on Base.

$0.05

GET /vin/{vin}

Full valuation — fair market value, trade-in, private party, deal score, and per-source breakdown.

$0.01

GET /vin/{vin}/decode

Specs only — year, make, model, trim, engine, body style, drivetrain, fuel type. No pricing.

$0.05

GET /vin/{vin}/history

90-day price trend with weekly data points, direction signal, and percent change.

$0.03

GET /market

Market average for any make/model/year. Returns low, average, and high with sample size.

Know what any used car is worth.

Used car pricing, answered from one API

How an agent chains this with other services

Four endpoints. One normalized schema.