Pay-per-call AI APIs: no account, no API key, pay in USDC
Updated 2026-10-21
Pay-per-call AI APIs charge for each request instead of a monthly plan, and many now accept USDC with no account or API key via x402. Of the 211 listings in our directory with a published price, 185 start at one cent or less per call, and 61 at a tenth of a cent ($0.001) or less.
Prices below come from each provider’s own site or x402 payment requirements when we verified them. Always check the provider before paying; per-call prices change.
How paying per call works
- Your code or agent calls the endpoint and gets back a 402 with the price.
- It signs a USDC payment for that amount and retries.
- The API returns the result. No sign-up, no stored card, no API key.
Background: what is x402?
AI Models & Inference
The lowest-priced listings in this category. All of them: best ai models & inference that accept crypto.
| # | Tool | Protocol | Networks | Tokens | Price / call | Verified |
|---|---|---|---|---|---|---|
| 1 | Losbeto | x402 | Algorand, Base, Polygon | USDC | $0.001–$0.99 | 2026-10-21 |
| 2 | JarvisClaw | x402 | Base, Solana | USDC | $0.0011–$0.621 | 2026-10-21 |
| 3 | BlockRun | x402 | Base | USDC | $0.002–$5.001 | 2026-10-21 |
| 4 | GlianaAI | x402 | Base, Solana | USDC | $0.002–$4.41 | 2026-10-21 |
| 5 | OnHub | x402 | Base | USDC | $0.002–$0.04 | 2026-10-21 |
Web Search & Scraping
The lowest-priced listings in this category. All of them: best web search & scraping that accept crypto.
| # | Tool | Protocol | Networks | Tokens | Price / call | Verified |
|---|---|---|---|---|---|---|
| 1 | ClawFetch.ai | x402 | Base | USDC | $0.001–$0.02 | 2026-10-21 |
| 2 | Exa | x402 | Arc, Base, Solana | USDC | $0.001–$0.007 | 2026-10-21 |
| 3 | mdapi | x402 | Base | USDC | $0.001–$0.01 | 2026-10-21 |
| 4 | Minifetch | x402 | Base, Solana | USDC | $0.001–$0.01 | 2026-10-21 |
| 5 | Munition | x402 | Arbitrum, Base, Polygon | USDC | $0.001–$0.05 | 2026-10-21 |
Other Data APIs
The lowest-priced listings in this category. All of them: best other data apis that accept crypto.
| # | Tool | Protocol | Networks | Tokens | Price / call | Verified |
|---|---|---|---|---|---|---|
| 1 | Agentic JP | x402 | Base, Polygon, Solana | USDC | $0.001–$0.009 | 2026-10-21 |
| 2 | Anyway Possible | x402 | Base | USDC | $0.001–$0.01 | 2026-10-21 |
| 3 | ForgeMesh Labs | x402 | Base | USDC | $0.001–$0.25 | 2026-10-21 |
| 4 | Invoket | x402 | Base | USDC | $0.001–$0.05 | 2026-10-21 |
| 5 | Oblique Markets | x402 | Base, Solana | USDC | $0.001–$1 | 2026-10-21 |
Crypto & Onchain Data
The lowest-priced listings in this category. All of them: best crypto & onchain data that accept crypto.
| # | Tool | Protocol | Networks | Tokens | Price / call | Verified |
|---|---|---|---|---|---|---|
| 1 | 3Route | x402 | Base, Solana, Etherlink | USDC | $0.00001–$0.001 | 2026-10-21 |
| 2 | anchor-x402 | x402 | Arc, Base, Polygon | USDC | $0.001–$1.77 | 2026-10-21 |
| 3 | hyperextend | x402 | Base | USDC | $0.001–$0.1258 | 2026-10-21 |
| 4 | Market Intelligence API | x402 | Arbitrum, Base, Polygon | USDC | $0.001–$5 | 2026-10-21 |
| 5 | OneSource | x402 | Base | USDC | $0.001–$0.05 | 2026-10-21 |
Image, Video & Voice Generation
The lowest-priced listings in this category. All of them: best image, video & voice generation that accept crypto.
| # | Tool | Protocol | Networks | Tokens | Price / call | Verified |
|---|---|---|---|---|---|---|
| 1 | AMNT | x402 | Base, Solana | USDC | $0.001–$0.015 | 2026-10-21 |
| 2 | Higgsfield AI | x402 | Base | USDC | $0.001–$0.02 | 2026-10-21 |
| 3 | Mart402 | x402 | Base | USDC | $0.001–$2.99 | 2026-10-21 |
| 4 | api2ls.com | x402 | Base, Solana | USDC | $0.01 | 2026-10-21 |
| 5 | StableStudio | x402 | Base, Solana | USDC | $0.01 | 2026-10-21 |
Tips for agents and developers
- Fund a dedicated wallet with a small USDC balance and set a spending cap in your client.
- Check which network a service accepts (most use Base; many also take Solana).
- Compare prices before you commit. Our x402 API comparison lists published prices per call, cheapest first.