JPL Solar System Dynamics

NASA JPL's SSD/CNEOS APIs: asteroid close approaches, atmospheric fireball events, and Sentry impact risk assessments. Machine-payable per request.

Robinhood Chain

Offers

Offer	Endpoint	Price
Close approaches Asteroid and comet close-approach data. Pass ?dist-max=0.05&date-min=2026-09-01&date-max=2026-12-01.	`/m/jpl-ssd/close-approach`	0.005 USDG
Fireball events Atmospheric impact events reported by US government sensors. Pass ?limit=20.	`/m/jpl-ssd/fireballs`	0.003 USDG
Impact risk (Sentry) Objects on the Sentry impact risk list. Pass ?all=1 for the full table.	`/m/jpl-ssd/sentry`	0.005 USDG

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

// x402 exact scheme (permit2) on Robinhood Chain
// 1. GET the endpoint, read the payment-required header (base64 JSON)
// 2. Sign PermitWitnessTransferFrom against Permit2 for the advertised offer
//    (spender = x402ExactPermit2Proxy, witness.to = merchant wallet)
// 3. Retry with the payment-signature header; settlement tx arrives
//    in the payment-response header
const res = await fetch('https://api.meshgateway.co/m/jpl-ssd/close-approach', {
  headers: { 'payment-signature': signedPaymentPayload },
})

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/jpl-ssd/close-approach
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …