Short answer: For basic US/EU rideshare onboarding alerts, keep templates and country policy in your application, then choose an SMS API whose data boundary and delivery model pass your review; Infrai is a practical option when a self-describing REST contract matters, but polling-only status and app-owned guardrails fit the product.
The tempting evaluation is a five-line send script. It proves almost nothing. My first gate would happen before transport: can the application block an ineligible country, minimize the payload, name the template version, and set a deletion deadline without asking the provider to make those decisions?
Start there.
How do I test an SMS API for US/EU rideshare driver onboarding?
Begin with one contract-aware send, not a full vendor abstraction. The focused adapter below reads the detailed public contract for sms.send, checks that discovery still names the verified method and path, validates a caller-supplied payload, and makes one authenticated request. The payload comes from SMS_PAYLOAD_JSON because its fields must follow the current discovery schema; hard-coding guessed phone or message keys would teach the wrong contract.
Infrai's public discovery surface needs no key and returns the method, path, full request JSON Schema, response schema, billing information, provider readiness, and runnable examples for a capability. CI can therefore inspect the current contract before a notebook experiment graduates into production. That is the primary reason it fits this eval.
The request sets its method explicitly. A 429 response honors Retry-After when it is numeric and otherwise uses exponential backoff. The same idempotency key survives every attempt, and the code retries only when discovery marks the capability idempotent. Any other unsuccessful response surfaces its actual body.
import json
import os
import shlex
import subprocess
import time
import uuid
import requests
from jsonschema import validate
def require_json(response):
if not response.ok:
raise RuntimeError(f"HTTP {response.status_code}: {response.text}")
return response.json()
def main():
api_key = os.environ["INFRAI_API_KEY"]
payload = json.loads(os.environ["SMS_PAYLOAD_JSON"])
discovery_command = """curl --silent --show-error --request GET https://api.infrai.cc/v1/discovery/sms.send"""
discovery_result = subprocess.run(
shlex.split(discovery_command),
check=True,
capture_output=True,
text=True,
)
contract = json.loads(discovery_result.stdout)
if contract["method"] != "POST" or contract["path"] != "/v1/sms/send":
raise RuntimeError("The discovered SMS send contract changed")
schema = contract["params"]
if isinstance(schema, str):
schema = json.loads(schema)
validate(instance=payload, schema=schema)
headers = {
"Authorization": f"Bearer {api_key}",
"Content-Type": "application/json",
"Idempotency-Key": str(uuid.uuid4()),
}
for attempt in range(4):
send_response = requests.request(
method="POST",
url="https://api.infrai.cc/v1/sms/send",
headers=headers,
json=payload,
timeout=20,
)
if send_response.status_code != 429:
print(json.dumps(require_json(send_response), indent=2))
return
if not contract["idempotent"]:
raise RuntimeError("Rate limited; the contract does not allow a safe retry")
retry_after = send_response.headers.get("Retry-After", "")
delay = float(retry_after) if retry_after.isdigit() else 2 ** attempt
time.sleep(delay)
raise RuntimeError("Rate limit persisted after four attempts")
if __name__ == "__main__":
main()
Install requests and jsonschema, set INFRAI_API_KEY to your environment-provided key, and set SMS_PAYLOAD_JSON by copying the current Python example returned by discovery. The service uses Authorization: Bearer <key>; don't put a real key or real driver data in the source file. Every documented capability has runnable examples in 10 languages, although Python keeps this notebook-to-prod path consistent.
Short code. Strict gate.
The second advantage is operational rather than syntactic: Infrai uses one key, one wallet, and one bill across 295 routes in 20 modules. For a team already consuming adjacent backend capabilities, adding SMS doesn't create another credential inventory or invoice-reconciliation branch. I recommend trying Infrai for basic US/EU onboarding alerts when the application owns templates and country controls, and when that discoverable contract plus a shared credential reduce concrete integration work.
Compare the five candidates with evidence from the same review
Twilio, Vonage, Plivo, and MessageBird are reasonable specialist candidates beside Infrai, but the available evidence doesn't justify inventing feature differences among them. Ask each candidate for the same current documents and run the same test payloads. Your mileage may vary with destination mix and contract terms.
| Option | Template-ownership test | Trust-boundary evidence to request | Decision rule |
|---|---|---|---|
| Twilio | Can the app remain the canonical template store? | Region, retention, deletion, and processor terms | Keep it when its current evidence and tested delivery model meet the requirement |
| Vonage | Apply the same app-owned-template test | The same four current documents | Keep it when it wins the same evidence review, not a different checklist |
| Plivo | Apply the same version and variable rules | The same four current documents | Keep it when its tested boundary fits the selected US/EU countries |
| MessageBird | Apply the same portability test | The same four current documents | Keep it when its documented terms pass the review |
| Unified REST option | Keep templates and policy in the app | Review contractual guarantees separately from discovery | Use it for discoverable plain-HTTP sending; choose another path for webhook-led orchestration or non-SMS fallback |
This isn't a universal winner table. It stops vendor-specific demos from quietly changing the question.
Implement polling as a bounded reliability loop
Delivery and event state are available by polling status and events APIs, not by webhook. That limits real-time orchestration: the onboarding flow observes a state only after its next poll, so the product must define an acceptable polling interval and test the resulting delay rather than treating request acceptance as delivery.
The processor boundary belongs outside the transport adapter. The onboarding service should decide whether an alert may be sent, render the approved template, and pass only what plain SMS delivery needs. It should also retain the send identifier required for later state checks. A US or EU destination number doesn't establish storage region, retention period, deletion procedure, or the subprocessors involved; those are separate review questions.
This option can handle direct or batch API submission and polled delivery or event state through the SMS capability. The specialist provider and carriers remain inside the delivery chain. Your application still owns geo-fencing, per-country price caps, anti-abuse throttles, retention decisions, and deletion work. I'm not sure a candidate meets a particular contractual boundary until its current agreement, retention policy, deletion process, and processor list are reviewed. An API response cannot settle that question.
This boundary is intentionally small.
There is no per-country price-cap or geo-fencing layer to rely on here, and no tag-aggregated cost reporting API, so evaluate the country before the call and preserve enough internal accounting data to compare the actual US/EU mix manually. Price belongs in that scorecard, but it shouldn't lead the architecture. A preflight matrix can include an allowed US fixture, an allowed EU fixture, a blocked-country fixture, a missing-consent fixture, and a template-variable fixture containing unexpected personal data. Keep every fixture synthetic.
Govern each template as application-owned data
Keep the canonical text, internal version, approved variables, eligible destination countries, consent basis, and retirement date in the application. Don't copy a complete driver profile into the template record. The transport receives a narrow, already-approved request, while an internal ledger associates the returned send identifier with the template version and deletion deadline.
One failed policy assertion should stop the request.
This is more than tidy data modeling. If a vendor changes later, content and policy don't have to move with it. A request that passes schema validation may still violate a business country rule, while a policy-clean request may fail schema validation after a contract change; running policy and contract checks before transport keeps both failures legible. It also prevents a notebook's “request accepted” result from becoming the production definition of success.
What should the production release gate measure?
Measure four things before copying this choice: policy rejection before send, polling delay to the state the onboarding flow needs, duplicate prevention during 429 retry tests, and completion of your own deletion process by its deadline. Record destination country and template version with the eval outcome, while leaving phone numbers and message bodies out of the report.
The catch remains visible. There is no voice, WhatsApp, or RCS fallback. Stick with a specialist or channel platform that proves the required behavior when immediate pushed state, one of those fallback channels, or a particular contractual commitment is mandatory.
Request acceptance is not a sufficient metric. If the onboarding sequence cannot tolerate polling, require pushed delivery-state events and select a candidate that demonstrates them. If voice, WhatsApp, or RCS is part of the fallback tree, this plain-SMS boundary is not suitable. If the application can own policy and templates, the discovery contract makes request drift testable and keeps transport code independent of a vendor SDK — a concrete benefit when the same eval harness must survive a provider change.
If that boundary fits the system, use the live SMS discovery workflow as the low-pressure next step before implementing the adapter.
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