RIPE Atlas - The Credit System
The RIPE Atlas credit system allows us to recognise participants' contributions to the system. RIPE Atlas probe hosts earn credits for the time their probes remain connected, and for the number of measurement results they generate, and in return can spend these credits to request services (user-defined measurements, called UDMs) from it. It is meant to serve as a means of measuring the level of contribution to, and consumption of, resources in the RIPE Atlas system.
Everything you need to know about your credits including history, visualisations, and a form to transfer your credits can be found at your "Credits" page. Simply find the link to "Credits" under your username in the navigation bar.
You can earn credits by hosting a RIPE Atlas probe, being a RIPE Atlas sponsor, being a RIPE NCC member or the member of another RIR, being an LIR (member of RIPE NCC) or through a transfer. You can spend your credits by scheduling user-defined measurements, or via a transfer.
Earning credits as a RIPE Atlas probe host
Every probe that you host earns you credits that can be spent on user-defined measurements. Credits are earned as long as the probe is connected to the RIPE Atlas infrastructure (shown as "connected"). Accounts are credited once per day.
A host (and sponsor, see below) receives 15 credits for each minute that their probe is connected to our network, so assuming that your probe is connected continuously, you should earn roughly 21,600 credits every 24 hours, which you can spend conducting user-defined measurements. If you host more than one probe, each connected probe will earn credits at this rate.
If you are not already a host, click here to learn more about hosting a RIPE Atlas probe.
Earning credits as a RIPE Atlas anchor host
Organisations hosting a RIPE Atlas anchor earn ten times as many credits as regular probe hosts.
Earning credits as a RIPE Atlas sponsor
Individuals and organisations can choose to sponsor blocks of probes, which gives you the collective benefit of all the probes you sponsor. If you sponsor 16 probes, you receive credits for all 16 probes in addition to the credits the probe hosts accumulate themselves. Organisations and individuals who sponsor probes are also entitled to credits.
Earning credits for measurement results
In addition to the methods for earning credits mentioned above, anyone who creates measurement results will also receive additional credits, at the rate of one credit per measurement result. This is our way of giving a little extra reward to those who contribute the most to RIPE Atlas, and especially benefits the hosts of probes and anchors that are heavily used.
Users can also transfer credits, and receive transferred credits from other RIPE Atlas users. To transfer credits to another user, select the 'Transfer' tab on your credits page and fill out the form. Note that the receiving user must be registered in the RIPE Atlas system.
You can also share your credits with other RIPE Atlas users on a regular basis by setting up a standing order using the “Standing Order” tab on your credits page. You can set the amount of credits you want to share, the threshold above which you will start automatically sharing your credits, and one or more recipients who will receive your credits (note that credits will be evenly distributed among the recipients, and that they must be registered RIPE Atlas users).
Measurement Cost Model
Each user-defined measurement (UDM) requires resources from the network of involved probes, as well as from the RIPE Atlas infrastructure itself. The credit system is therefore designed to make it more "expensive" (in terms of credit consumption) to run measurements that are more resource intensive.
Because of this, when you schedule a measurement, the system calculates how much each result should cost (this is the "unit cost"). Each time a result is delivered to you, the appropriate amount is withdrawn from your credit balance. The more results are delivered, the more this costs you. The scaling is linear, so, for example, five results will cost five times more credits.
Since the cost of a measurement over a certain time period only depends on the number of results delivered, but not on the frequency or number of probes assigned to the measurement, it costs the same to run a measurement, for example, from one probe every minute or from ten probes every ten minutes or from 100 probes every 100 minutes. (All of these measurements will yield an average of one result per minute).
For efficiency reasons, you are not charged immediately for each delivered result. Instead, we charge in batches every four to six hours for all results delivered in that period.
Unit cost calculation
The cost for the individual result depends on what type of measurement you conduct, and what options and flags were specified. The following sections describe the current settings. One-off measurement result is twice as expensive.
Ping and ping6
Unit cost = N * (int(S/1500) + 1)
- N - number of packet in the train (default: 3), S - packet size (default: 48 octets)
Which makes the default unit cost = 3
DNS and DNS6
Unit cost for UDP: 10 credits/result
Unit cost for TCP: 20 credits/result
Traceroute and traceroute6
Unit cost = 10 * N * (int(S/1500) + 1)
- N - number of packet in the train (default: 3), S - packet size (default: 40 octets)
Which makes the default unit cost = 30
SSLCert and SSLCert6
Unit cost: 10 credits/result
If you schedule a traceroute using five probes to run twice per hour for a period of two days (48 hours), you would expect 480 result lines. (5 probes x 2 measurements/hour x 48 hours = 480) With 480 result lines, the cost for this traceroute measurement would be 14,400 credits (30 credits/result x 480 results = 14,400).
Running Out of Credits
It's possible to consume credits faster than you accumulate them. If you are about to run out of credits while running measurements, we'll notify you and, in extreme cases, stop some of your measurements in accordance with the following rules:
- We periodically calculate your credit consumption rate (number of credits used per time unit). This calculation includes the debits as well as the credits.
- Based on the consumption rate, we make an approximation about the time remaining before your account balance reaches zero credits.
- If the time remaining is projected to be less than five days, we will send you a warning email explaining the situation.
- If you're already in debt, we will stop your most costly measurement, and notify you by email.
If we do have to stop one of your measurements, you will still be able to access the measurement's results up until you ran out of credits. Once you have earned sufficient credits again, you'll have to recreate the measurement.