ProofTell API · 0.1.0-draft

API reference

One call to assess the fraud risk of a phone number, email address and IP address.

Draft contract.

This reference is under review and will change before v1. Field names may still move.

Base URL: https://api.prooftell.com
Format: JSON in, JSON out. Money is a decimal string in USD, never a float: four places for the cost of a call, two for balances.
Keys: Created in the dashboard: pt_live_ for real calls, pt_test_ for the sandbox.

Authentication

Authorization: Bearer pt_live_…, or pt_test_… for sandbox calls (simulated, free). Keys are created in the dashboard. A missing, unknown or revoked key gets 401 invalid_api_key.

curl https://api.prooftell.com/v1/balance \
  -H "Authorization: Bearer pt_live_…"

Errors

Every error is a JSON body with a stable code and a readable message; some carry more, such asretry_after or the amounts to top up. Codes are stable, messages are not.

Stable: invalid_api_key, bad_request, invalid_phone, invalid_country, invalid_email, invalid_timeout, invalid_ip, daily_quota_reached, insufficient_balance, rate_limited, signals_unavailable, sandbox_not_available, not_implemented.

{
  "error": {
    "code": "insufficient_balance",
    "message": "Top up to run this signal.",
    "cost_required": "0.0010",
    "cost_available": "0.0000",
    "cost_missing": "0.0010",
    "topup_url": "https://app.prooftell.com/billing"
  }
}

Sandbox

A pt_test_ key turns every signal endpoint into a sandbox: results are simulated and deterministic, no signal source is called, nothing is billed, and an assessment answers with mode: test. Any input works; each endpoint documents the inputs that produce specific results, so you can build and test your integration, an unavailable signal included, before a real key is involved. Files need a live key.

Assess

POST/v1/assess

Assess the risk of an identity

Send any mix of phone, email and IP. Each signal runs in parallel; a signal that cannot run (not supplied, or its source is unavailable) is reported, never guessed.

When a supplied signal is unavailable, the score comes from the signals that ran, the missing one adds a 0-point reason signal_unavailable_<signal>, and the verdict is raised to at least review (an organization setting can turn the raise off). When none of the supplied signals ran, the call fails with 503 signals_unavailable.

The call costs the signals that returned a result, each at the rate card's list price (cost, currency, and a line per signal); unavailable signals cost nothing. Static signals draw on the daily quota when the balance cannot cover them.

With a pt_test_ key the call is a sandbox: results are simulated and deterministic, no signal is called, nothing is billed, and mode is test. Any input works; these produce specific results: phones +15005550001 (valid mobile), +15005550002 (VoIP), +15005550003 (invalid), +15005550004 (signal unavailable); emails <name>@sandbox.prooftell.com with <name> one of allow, undeliverable, disposable, catchall, greylisted, risky, unavailable; IPs 203.0.113.1 (clean), 203.0.113.66 (Tor), 203.0.113.77 (VPN), 203.0.113.99 (datacenter), 203.0.113.4 (unavailable).

Rate limit: 20 requests a second per key, bursts of 50 (429 rate_limited).

Request body

Field	Type	Description
phone	string	E.164 preferred; national format needs `country`. Example `+447700900123`.
email	string (email)	Example `jane@example.com`.
ip	string	IPv4 or IPv6 of the end user. Example `203.0.113.7`.
country	string	ISO 3166-1 alpha-2 hint for national-format phones. Example `GB`.
reference	string	Your own id for this check, echoed back. Up to 128 characters.

Responses

200Assessment. Body: Assessment.
400An Error body.
401An Error body.
402An Error body.
429An Error body.
503An Error body.

curl -X POST https://api.prooftell.com/v1/assess \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "phone": "+447700900123",
  "email": "jane@example.com",
  "ip": "203.0.113.7",
  "country": "GB"
}'

{
  "id": "asm_8f3k2m9q",
  "mode": "live",
  "reference": "string",
  "score": 0,
  "verdict": "allow",
  "reasons": [
    {
      "code": "email_disposable",
      "points": 40,
      "message": "The email address uses a disposable provider."
    }
  ],
  "signals": {
    "phone": {
      "status": "ok",
      "cost": "0.0010",
      "result": {}
    },
    "email": {
      "status": "ok",
      "cost": "0.0010",
      "result": {}
    },
    "ip": {
      "status": "ok",
      "cost": "0.0010",
      "result": {}
    }
  },
  "ruleset": "2026-10-01",
  "cost": "0.0045",
  "currency": "USD",
  "createdAt": "2026-10-01T09:00:00Z"
}

Signals

POST/v1/phone

Verify a phone number

Veriphone's static verification, sold by ProofTell: the response is Veriphone's /v3/verify JSON in static mode — status, phone_valid, e164, country_code, carrier, phone_type and the rest, unchanged — plus ProofTell's cost, currency and signals. A run is charged exactly when Veriphone would have charged it (status is success); a number that could not be parsed is answered and free.

Charged at the rate card's list price from your balance (cost says what this call cost). Static runs draw on your organization's daily quota when the balance cannot cover them, at no charge; when it is used up the call fails with 429 daily_quota_reached and retry_after seconds. A provider-backed signal the balance cannot cover fails with 402 insufficient_balance and the amounts to top up.

With a pt_test_ key the call is a sandbox: the result is simulated and deterministic, no signal is called, nothing is billed. Any number works; +15005550001 is a valid mobile, +15005550002 VoIP, +15005550003 invalid and +15005550004 answers 503 as an unavailable signal would.

Request body

Field	Type	Description
phonerequired	string	E.164 preferred; national format needs `country`. Up to 32 characters. Example `+447700900123`.
country	string	ISO 3166-1 alpha-2 hint for national-format phones. Example `GB`.

Responses

200Veriphone's result plus ProofTell's billing fields. Body: PhoneResult.
400An Error body.
401An Error body.
402An Error body.
429An Error body.
503An Error body.

curl -X POST https://api.prooftell.com/v1/phone \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "phone": "+447700900123",
  "country": "GB"
}'

{
  "status": "success",
  "phone_valid": true,
  "e164": "+447700900123",
  "country_code": "GB",
  "carrier": "string",
  "phone_type": "string",
  "cost": "0.0000",
  "currency": "USD",
  "signals": {
    "static": {
      "status": "ok",
      "cost": "0.0000"
    }
  }
}

POST/v1/email

Verify an email address

Verimail's verification, sold by ProofTell: the response is Verimail's /v3/verify JSON — status, result, verdict, reason, billed, suggested_action, flags and the rest, unchanged — plus ProofTell's cost, currency and signals. A run is charged exactly when Verimail would have charged it (its billed is true): syntax errors, unknowns and softbounces are free.

Same quota rules as /v1/phone. timeout (milliseconds) bounds Verimail's own SMTP budget; past it the address comes back unknown, free.

With a pt_test_ key the call is a sandbox, simulated and free: any address is deliverable, and <name>@sandbox.prooftell.com with <name> one of undeliverable, disposable, catchall, greylisted, risky gives that result; unavailable answers 503.

Request body

Field	Type	Description
emailrequired	string	Up to 254 characters. Example `jane@example.com`.
timeout	integer	Verimail's budget for the SMTP dialogue, milliseconds. 1000 to 60000.

Responses

200Verimail's result plus ProofTell's billing fields. Body: EmailResult.
400An Error body.
401An Error body.
402An Error body.
429An Error body.
503An Error body.

curl -X POST https://api.prooftell.com/v1/email \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "email": "jane@example.com"
}'

{
  "status": "string",
  "result": "string",
  "verdict": "string",
  "reason": "string",
  "billed": true,
  "cost": "0.0000",
  "currency": "USD",
  "signals": {
    "email": {
      "status": "ok",
      "cost": "0.0000"
    }
  }
}

POST/v1/ip

Look up an IP address

ProofTell's own IP intelligence: geography and network from GeoLite2, plus open Tor, VPN and datacenter lists — all in ProofTell's infrastructure, the address never leaves. Charged when the address parsed and was looked up; a private or reserved address is answered (routable: false) and free. Same quota rules as /v1/phone.

With a pt_test_ key the call is a sandbox, simulated and free: 203.0.113.1 is clean, 203.0.113.66 Tor, 203.0.113.77 VPN, 203.0.113.99 datacenter and 203.0.113.4 answers 503.

Request body

Field	Type	Description
iprequired	string	IPv4 or IPv6. Example `203.0.113.7`.

Responses

200The address, its geography, its network and the list flags, plus the billing fields. Body: IpResult.
400An Error body.
401An Error body.
402An Error body.
429An Error body.
503An Error body.

curl -X POST https://api.prooftell.com/v1/ip \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "ip": "203.0.113.7"
}'

{
  "status": "success",
  "ip": "string",
  "version": 4,
  "routable": true,
  "country_code": "GB",
  "country": "string",
  "region": "string",
  "city": "string",
  "latitude": 0,
  "longitude": 0,
  "accuracy_km": 0,
  "timezone": "string",
  "asn": 15169,
  "as_org": "GOOGLE",
  "is_tor": true,
  "is_vpn": true,
  "is_datacenter": true,
  "is_anonymous": true,
  "anycast": true,
  "data_version": "string",
  "cost": "string",
  "currency": "USD",
  "signals": {
    "ip": {
      "status": "ok",
      "cost": "0.0000"
    }
  }
}

Files

GET/v1/files

Your organization's files

Responses

200Newest first An array of FileJob.
401An Error body.
501An Error body.

curl https://api.prooftell.com/v1/files \
  -H "Authorization: Bearer pt_live_…"

[
  {
    "id": "string",
    "name": "string",
    "status": "uploading",
    "stage": "string",
    "format": {},
    "columns": {
      "phone": 0,
      "email": 0,
      "ip": 0,
      "header_row": true
    },
    "header": [
      "string"
    ],
    "samples": [
      [
        "string"
      ]
    ],
    "rows": 0,
    "unique_rows": 0,
    "signals": [
      "string"
    ],
    "hold": "string",
    "charged": "string",
    "counters": {},
    "error": "string",
    "created_at": "2026-10-01T09:00:00Z",
    "expires_at": "2026-10-01T09:00:00Z"
  }
]

POST/v1/files

Start a file job

Two ways in. Signed upload (any size): send JSON {name, content_type}; the answer carries upload_url and headers — PUT the bytes there with exactly those headers (the URL accepts one upload, for 12 hours), then call finish. Direct upload (up to 32 MB): send the bytes as multipart/form-data field file; analysis runs at once and the answer is the analysed job. Upload and analysis are free. CSV, TSV, TXT (one value per line) and XLSX. Files need a live key: with a pt_test_ key every /v1/files call answers 501 sandbox_not_available.

Request bodyapplication/json · multipart/form-data

Field	Type	Description
namerequired	string	Up to 200 characters. Example `leads.csv`.
content_type	string	Example `text/csv`.

Responses

201The job — with upload_url and headers for the signed flow. Body: FileCreated.
400An Error body.
401An Error body.
413An Error body.
501An Error body.

curl -X POST https://api.prooftell.com/v1/files \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "name": "leads.csv",
  "content_type": "text/csv"
}'

{
  "file": {
    "id": "string",
    "name": "string",
    "status": "uploading",
    "stage": "string",
    "format": {},
    "columns": {
      "phone": 0,
      "email": 0,
      "ip": 0,
      "header_row": true
    },
    "header": [
      "string"
    ],
    "samples": [
      [
        "string"
      ]
    ],
    "rows": 0,
    "unique_rows": 0,
    "signals": [
      "string"
    ],
    "hold": "string",
    "charged": "string",
    "counters": {},
    "error": "string",
    "created_at": "2026-10-01T09:00:00Z",
    "expires_at": "2026-10-01T09:00:00Z"
  },
  "upload_url": "https://…",
  "headers": {}
}

GET/v1/files/{fileId}

A file job and its progress

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.

Responses

200The job. Body: FileJob.
401An Error body.
404An Error body.
501An Error body.

curl https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6 \
  -H "Authorization: Bearer pt_live_…"

{
  "id": "string",
  "name": "string",
  "status": "uploading",
  "stage": "string",
  "format": {},
  "columns": {
    "phone": 0,
    "email": 0,
    "ip": 0,
    "header_row": true
  },
  "header": [
    "string"
  ],
  "samples": [
    [
      "string"
    ]
  ],
  "rows": 0,
  "unique_rows": 0,
  "signals": [
    "string"
  ],
  "hold": "string",
  "charged": "string",
  "counters": {},
  "error": "string",
  "created_at": "2026-10-01T09:00:00Z",
  "expires_at": "2026-10-01T09:00:00Z"
}

DELETE/v1/files/{fileId}

Delete a file job and its objects

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.

Responses

204Deleted
401An Error body.
404An Error body.
501An Error body.

curl -X DELETE https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6 \
  -H "Authorization: Bearer pt_live_…"

POST/v1/files/{fileId}/finish

The signed upload landed — analyse it

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.

Responses

200The analysed job (format, columns, rows, header, samples). Body: FileJob.
400An Error body.
401An Error body.
404An Error body.
409An Error body.
501An Error body.

curl -X POST https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6/finish \
  -H "Authorization: Bearer pt_live_…"

{
  "id": "string",
  "name": "string",
  "status": "uploading",
  "stage": "string",
  "format": {},
  "columns": {
    "phone": 0,
    "email": 0,
    "ip": 0,
    "header_row": true
  },
  "header": [
    "string"
  ],
  "samples": [
    [
      "string"
    ]
  ],
  "rows": 0,
  "unique_rows": 0,
  "signals": [
    "string"
  ],
  "hold": "string",
  "charged": "string",
  "counters": {},
  "error": "string",
  "created_at": "2026-10-01T09:00:00Z",
  "expires_at": "2026-10-01T09:00:00Z"
}

POST/v1/files/{fileId}/verify

Run the file

Holds unique rows × rate per selected signal on your balance (402 insufficient_balance with the amounts when it cannot cover it), then runs. Rows are charged as they complete, against the hold; duplicates run once and are flagged in pt_duplicate_of; rows a source could not judge are free. columns overrides the detected mapping (0-based; -1 = none).

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.

Request body

Field	Type	Description
signalsrequired	array of string
columns	FileColumns

Responses

200The job, now verifying. Body: FileJob.
400An Error body.
401An Error body.
402An Error body.
404An Error body.
409An Error body.
501An Error body.

curl -X POST https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6/verify \
  -H "Authorization: Bearer pt_live_…" \
  -H "Content-Type: application/json" \
  -d '{
  "signals": [
    "phone_static"
  ]
}'

{
  "id": "string",
  "name": "string",
  "status": "uploading",
  "stage": "string",
  "format": {},
  "columns": {
    "phone": 0,
    "email": 0,
    "ip": 0,
    "header_row": true
  },
  "header": [
    "string"
  ],
  "samples": [
    [
      "string"
    ]
  ],
  "rows": 0,
  "unique_rows": 0,
  "signals": [
    "string"
  ],
  "hold": "string",
  "charged": "string",
  "counters": {},
  "error": "string",
  "created_at": "2026-10-01T09:00:00Z",
  "expires_at": "2026-10-01T09:00:00Z"
}

POST/v1/files/{fileId}/stop

Stop a running file

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.

Responses

204Stop requested
401An Error body.
404An Error body.
409An Error body.
501An Error body.

curl -X POST https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6/stop \
  -H "Authorization: Bearer pt_live_…"

GET/v1/files/{fileId}/download

A 15-minute link to the result

Parameters

Field	Type	Description
fileIdrequired	string · path	Example `fil_k2m9q7x3a8b4c5d6`.
which	string · query	One of `result`, `xlsx`, `source`. Default `result`.

Responses

200The link (result is a CSV; while running, a partial result with unreached rows pending)
401An Error body.
404An Error body.
409An Error body.
501An Error body.

Field	Type	Description
urlrequired	string (uri)

curl https://api.prooftell.com/v1/files/fil_k2m9q7x3a8b4c5d6/download \
  -H "Authorization: Bearer pt_live_…"

{
  "url": "https://…"
}

Account

GET/v1/pricingPublic

The rate card

Public. One price list for everyone: the rate of every signal per run and per 1,000, country bands for banded signals, the top-up bonus ladder, the minimum top-up and the subscription amounts. Cached for five minutes. The website, the dashboard and the docs all read prices from here.

Responses

200The rate card. Body: Pricing.

curl https://api.prooftell.com/v1/pricing

{
  "version": "string",
  "currency": "USD",
  "services": [
    {
      "service": "phone_static",
      "label": "Phone verification",
      "per_run": "0.0010",
      "per_1000": "1.00",
      "bands": {}
    }
  ],
  "bonus_ladder": [
    {
      "min": "100.00",
      "bonus_percent": 5
    }
  ],
  "min_topup": "10.00",
  "subscription_amounts": [
    "string"
  ]
}

GET/v1/balance

Your organization's balance

Balance to the cent — paid and promotional money, held amounts — and whether the daily quota still has room.

Responses

200The balance. Body: Balance.
401An Error body.

curl https://api.prooftell.com/v1/balance \
  -H "Authorization: Bearer pt_live_…"

{
  "currency": "USD",
  "balance": "124.00",
  "paid": "string",
  "promotional": "string",
  "held": "string",
  "quota": "available"
}

Objects

PhoneRequest

Field	Type	Description
phonerequired	string	E.164 preferred; national format needs `country`. Up to 32 characters. Example `+447700900123`.
country	string	ISO 3166-1 alpha-2 hint for national-format phones. Example `GB`.

PhoneResult

Veriphone's /v3/verify static response, unchanged, plus the three ProofTell fields below.

Field	Type	Description
statusrequired	string	`success`: the number was judged (valid or not) and the run counts; `error`: it could not be parsed, free. One of `success`, `error`.
phone_valid	boolean
e164	string	Example `+447700900123`.
country_code	string	Example `GB`.
carrier	string
phone_type	string
costrequired	string	What this call cost, in `currency`, four decimals. Example `0.0000`.
currencyrequired	string	One of `USD`.
signalsrequired	object
↳ static	SignalLine

EmailRequest

Field	Type	Description
emailrequired	string	Up to 254 characters. Example `jane@example.com`.
timeout	integer	Verimail's budget for the SMTP dialogue, milliseconds. 1000 to 60000.

EmailResult

Verimail's /v3/verify response, unchanged, plus the three ProofTell fields below.

Field	Type	Description
statusrequired	string
result	string
verdict	string
reason	string
billedrequired	boolean	Whether this run counted, as Verimail decides it.
costrequired	string	Example `0.0000`.
currencyrequired	string	One of `USD`.
signalsrequired	object
↳ email	SignalLine

Pricing

Field	Type	Description
versionrequired	string
currencyrequired	string	One of `USD`.
servicesrequired	array of object
bonus_ladderrequired	array of object
min_topuprequired	string	Example `10.00`.
subscription_amountsrequired	array of string

Balance

Field	Type	Description
currencyrequired	string	One of `USD`.
balancerequired	string	paid + promotional − held Example `124.00`.
paidrequired	string
promotionalrequired	string
heldrequired	string	Reserved by running files.
quotarequired	string	The daily quota of static runs, unnumbered. One of `available`, `exhausted`.

IpRequest

Field	Type	Description
iprequired	string	IPv4 or IPv6. Example `203.0.113.7`.

IpResult

Field	Type	Description
statusrequired	string	One of `success`.
iprequired	string
versionrequired	integer	One of `4`, `6`.
routablerequired	boolean	False for private, loopback, link-local and multicast addresses.
country_code	string \| null	Example `GB`.
country	string \| null
region	string \| null
city	string \| null
latitude	number
longitude	number
accuracy_km	integer
timezone	string
asn	integer \| null	Example `15169`.
as_org	string \| null	Example `GOOGLE`.
is_torrequired	boolean
is_vpnrequired	boolean
is_datacenterrequired	boolean
is_anonymousrequired	boolean	Tor or VPN.
anycast	boolean
data_version	string	Identifies the data set the answer came from.
costrequired	string
currencyrequired	string	One of `USD`.
signalsrequired	object
↳ ip	SignalLine

CreateFile

Field	Type	Description
namerequired	string	Up to 200 characters. Example `leads.csv`.
content_type	string	Example `text/csv`.

FileCreated

Field	Type	Description
filerequired	FileJob
upload_url	string (uri)	Signed flow only.
headers	object of string

FileColumns

Field	Type	Description
phonerequired	integer	0-based column; -1 = none
emailrequired	integer
iprequired	integer
header_rowrequired	boolean

VerifyFileRequest

Field	Type	Description
signalsrequired	array of string
columns	FileColumns

FileJob

Field	Type	Description
idrequired	string
namerequired	string
statusrequired	string	One of `uploading`, `ready`, `verifying`, `complete`, `failed`, `stopped`, `expired`.
stage	string
format	object \| null	kind csv\|tsv\|txt\|xlsx, delimiter, encoding, sheet
columns	FileColumns \| null
header	array of string
samples	array of array of string
rowsrequired	integer
unique_rowsrequired	integer
signalsrequired	array of string
holdrequired	string	Dollars held while running.
chargedrequired	string
countersrequired	object of integer	`done`, `unique`, `duplicates`, `unavailable`, `<signal>_runs`.
error	string \| null
created_atrequired	string (date-time)
expires_atrequired	string (date-time)	Files and results are deleted 30 days after upload.

SignalLine

Field	Type	Description
statusrequired	string	One of `ok`, `unavailable`.
costrequired	string	Example `0.0000`.

AssessRequest

Field	Type	Description
phone	string	E.164 preferred; national format needs `country`. Example `+447700900123`.
email	string (email)	Example `jane@example.com`.
ip	string	IPv4 or IPv6 of the end user. Example `203.0.113.7`.
country	string	ISO 3166-1 alpha-2 hint for national-format phones. Example `GB`.
reference	string	Your own id for this check, echoed back. Up to 128 characters.

Assessment

Field	Type	Description
idrequired	string	Example `asm_8f3k2m9q`.
moderequired	string	`test` for sandbox calls made with a `pt_test_` key. One of `live`, `test`.
reference	string
scorerequired	integer	0 = no risk found, 100 = highest risk. 0 to 100.
verdictrequired	string	Score compared with your organization's thresholds; at least `review` when a supplied signal was unavailable (unless the organization turned that off). One of `allow`, `review`, `deny`.
reasonsrequired	array of Reason
signalsrequired	object
↳ phone	Signal
↳ email	Signal
↳ ip	Signal
rulesetrequired	string	Version of the scoring rules that produced this result. Example `2026-10-01`.
costrequired	string	The sum of the signal lines, four decimals. Example `0.0045`.
currencyrequired	string	One of `USD`.
createdAtrequired	string (date-time)

Reason

Field	Type	Description
coderequired	string	Example `email_disposable`.
pointsrequired	integer	Example `40`.
messagerequired	string	Example `The email address uses a disposable provider.`.

Signal

Field	Type	Description
statusrequired	string	One of `ok`, `unavailable`.
costrequired	string	Example `0.0010`.
result	object	The signal's own fields: `/v1/phone`, `/v1/email` and `/v1/ip` document them.

Error

Field	Type	Description
errorrequired	object
↳ coderequired	string	Stable: `invalid_api_key`, `bad_request`, `invalid_phone`, `invalid_country`, `invalid_email`, `invalid_timeout`, `invalid_ip`, `daily_quota_reached`, `insufficient_balance`, `rate_limited`, `signals_unavailable`, `sandbox_not_available`, `not_implemented`.
↳ messagerequired	string
↳ retry_after	integer	Seconds until the daily quota resets (on `daily_quota_reached`; also the `Retry-After` header).
↳ cost_required	string	On `insufficient_balance`: what the run costs.
↳ cost_available	string	On `insufficient_balance`: your balance.
↳ cost_missing	string
↳ topup_url	string (uri)	Where to top up.