{ "data": { "a": { "slug": "didww-voice-and-number-management", "name": "DIDWW Voice and Number Management API", "vendor": "DIDWW Ireland Limited", "vendorUrl": "https://www.didww.com", "kind": "http-api", "category": "voice-calling", "summary": "DIDWW is a telecoms carrier selling phone numbers in more than 90 countries with inbound and outbound SIP trunking. Its REST API v3 orders numbers and configures trunks and capacity, and a remote MCP server covers the same account tasks.", "url": "https://www.anchorterminal.com/tools/didww-voice-and-number-management", "markdownUrl": "https://www.anchorterminal.com/tools/didww-voice-and-number-management.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/didww-voice-and-number-management.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/didww-voice-and-number-management.json", "repo": "https://github.com/didww/didww-api-3-openapi", "license": "Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT", "transports": [ "http" ], "remoteUrl": "https://api.didww.com/mcp", "packages": [ { "registry": "npm", "name": "@didww/sdk" }, { "registry": "pypi", "name": "didww" } ], "auth": "api-key", "authNotes": "REST API v3 takes an API key in the `Api-Key` header with no `Bearer` prefix. Keys are created by a signed-in person in the User Panel under APIs, DIDWW API 3, with a friendly name and an optional source IP allow list. No scopes or read-only keys were found. Production and sandbox keys are separate. Access is self-serve after a browser sign-up with email confirmation. Outbound trunks need an approved application. The MCP server at `https://api.didww.com/mcp` uses OAuth 2.0 with PKCE and dynamic client registration, a browser sign-in and the user's panel roles, with tokens lasting two hours.", "pricing": "usage", "pricingNotes": "No per-number or per-minute price is public. Price lists are requested through a form or read inside an account or through the API. Accounts are free and prepaid in US dollars, with a $30 minimum balance before ordering and a $100 minimum for wire transfers. A number costs a one-time fee equal to one month's charge, waived for API orders, plus a monthly charge. Inbound capacity is flat-rate per channel or per minute, and outbound termination is per minute. The sandbox is free and takes Stripe test cards (https://www.didww.com/pricing.md, checked 2026-10-09).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the OpenAPI document, the docs indexes, the authentication guide or the pricing page (checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 10, "npmWeekly": 462, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://doc.didww.com/api3/2026-04-16/index.html", "llmsTxt": "https://doc.didww.com/llms.txt", "openapi": "https://doc.didww.com/openapi/2026-04-16/v3_api.json", "capabilities": [ "voice.numbers", "voice.sip" ], "tags": [ "hosted", "sip", "phone-numbers", "openapi", "llms-txt", "mcp", "oauth", "sandbox", "typescript", "python", "webhooks", "prepaid" ], "lastRelease": "2026-10-07", "graded": true, "anchor": { "graded": true, "score": 65.1, "grade": "B", "agentReady": false, "rank": 330, "ranked": true, "rankOf": 950, "categoryRank": 5, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 77, "maintenance": 83, "payments": 15, "reliability": 66, "schema": 87, "security": 57, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": 0, "verdict": "An OpenAPI 3.0.3 document with 107 operations, Markdown docs, a free sandbox and SDKs in seven languages cover number ordering and SIP trunk set-up. No per-number or per-minute price is public, API keys carry no scopes, orders have no idempotency key, and outbound calling needs an approved application. Calls travel over SIP only.", "bestFor": "Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API.", "strengths": [ "A public OpenAPI 3.0.3 document describes 107 operations on 67 paths, and 105 of them carry a description of purpose and behaviour", "Every docs page has a Markdown twin, with llms.txt indexes on both sites, an OpenAPI discovery manifest and an MCP server card", "A sandbox at `https://sandbox-api.didww.com/v3` is free, separate from production, and funded with Stripe test cards", "The versioning policy says released dated API versions are never retired, and an account stays on its version until a person upgrades it", "The MCP server shows a server-side preview and waits for confirmation before purchases, deletions and PSTN rate acceptance, and a confirmation works once", "Official SDKs for TypeScript, Python, PHP, Java, Go, .NET and Ruby are public under MIT, with Ruby, Python and TypeScript tagged on 7 October 2026" ], "weaknesses": [ "No per-number or per-minute price is published. Price lists are sent on request or shown inside an account, and a $30 balance is needed before ordering", "REST API keys reach the whole account. An optional source IP allow list is the only restriction, with no scopes and no read-only key", "No idempotency key was found on `POST /orders`, which charges the prepaid balance at once, so a retried request can buy twice", "The API cannot place, answer, record or stream a call. Calls run over the customer's own SIP system, and Call Events webhooks are switched on by support", "Outbound trunks need an approved application from a business account with a company name and VAT or tax ID", "Callback signing moved from an API key to a separate callback secret on 6 October 2026, and the 2026-04-16 changelog page does not record it", "No security.txt, disclosure policy, bug bounty, uptime SLA, data processing agreement or sub-processor list was found", "The terms forbid auto-dialling, telemarketing and continuous or extensive call forwarding, which matters before an agent places outbound calls" ], "agentNotes": [ "Send `Api-Key: \u003ckey\u003e` with no `Bearer` prefix, plus `Accept: application/vnd.api+json`, and `Content-Type: application/vnd.api+json` on every request with a body", "Set `X-DIDWW-API-Version: 2026-04-16` on each request and read `meta.api_version` in the reply. A header older than the account's version is ignored", "Before retrying a timed-out `POST /orders`, list `GET /orders` first. The order is charged to the balance at once and no idempotency key exists", "Stay under 20 requests a second per key. On `429` wait before retrying, since no `Retry-After` header is documented", "Use `fields[...]`, `filter[...]`, `include` and `page[size]` (default 50, maximum 100) to keep JSON:API replies small", "Check `GET /address_requirements` before buying a number. Many countries need a verified identity and address, and the sandbox cannot run identity verification", "Create and enable a callback secret in the User Panel before relying on callbacks. Without one nothing is sent, and receivers must verify `X-DIDWW-Signature`" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 65.1 } ], "editorialScores": { "ergonomics": 77, "maintenance": 83, "payments": 15, "reliability": 66, "schema": 87, "security": 57, "transparency": 55 }, "provenanceScore": 85 }, "connect": { "install": "npm install @didww/sdk", "http": "GET https://api.didww.com/v3/countries\nApi-Key: YOUR_API_KEY\nX-DIDWW-API-Version: 2026-04-16\nAccept: application/vnd.api+json" }, "letme": { "capability": "https://letme.dev/voice.numbers", "tool": "https://letme.dev/didww-voice-and-number-management" }, "area": "voice", "provenance": { "legalEntity": "DIDWW Ireland Limited", "domain": "didww.com", "domainRegistered": "2006-01-16", "endpointOnVendorDomain": true, "terms": "https://www.didww.com/DIDWW-Terms-and-Agreements", "privacy": "https://www.didww.com/privacy-notice", "statusPage": "https://status.didww.com", "changelog": "https://doc.didww.com/api3/2026-04-16/changelog.html", "securityTxt": "none", "checked": "2026-10-09", "notes": [ "The terms link is the DIDWW Terms and Agreements, Rev 3.1, copyright 2026, between the customer and DIDWW Ireland Limited of 25 North Wall Quay, Dublin 1. It covers all DIDWW services and refers to a Service Appendix.", "The Privacy Notice is Rev 2.1, copyright 2025. It gives the company number as 473521 and names gdpr@didww.com for requests. No data processing agreement or sub-processor list was found.", "The REST API and the MCP server answer on api.didww.com and the sandbox on sandbox-api.didww.com.", "The status page runs on Instatus with eight components, among them DIDWW API, Inbound Voice and Outbound Voice.", "https://www.didww.com/.well-known/security.txt returned 404.", "RDAP for didww.com gives a registration date of 2006-01-16.", "The changelog link is the page for API version 2026-04-16. Its entries are not dated. Dated revisions are in the commit history of github.com/didww/didww-api-3-openapi.", "No clause on automated access, scraping or benchmarking was found in the Terms and Agreements. robots.txt on www.didww.com and doc.didww.com allows the pages read.", "https://api.didww.com/robots.txt answered 403, so no request was sent to that host and the OAuth metadata was not read." ], "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/didww-voice-and-number-management.json", "live": { "slug": "didww-voice-and-number-management", "probe": { "target": "https://api.didww.com/mcp", "method": "get", "lastAt": "2026-10-10T03:07:03.494188648Z", "lastOk": true, "lastStatus": 401, "lastMs": 395, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 394, "p95ms24h": 527, "samples24h": 117, "samples30d": 117, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 85 }, { "date": "2026-10-10", "probes": 32, "ok": 32 } ] }, "vendorStatus": { "page": "https://status.didww.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:50:25.908796867Z" }, "versions": [ { "registry": "npm", "name": "@didww/sdk", "version": "3.1.1", "seenAt": "2026-10-09T16:49:43.396621514Z" }, { "registry": "pypi", "name": "didww", "version": "3.2.0", "released": "2026-10-08", "seenAt": "2026-10-09T16:49:44.365849676Z" } ], "githubStars": 10, "npmWeekly": 462, "pypiWeekly": 915, "pages": [ { "url": "https://doc.didww.com/api3/2026-04-16/changelog.html", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:36:22.294016104Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7d9c86f4f536" }, { "url": "https://www.didww.com/pricing.md", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:49:33.776952203Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "60eebb22a63e" }, { "url": "https://www.didww.com/privacy-notice", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:49:35.769637352Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "a193b3f64bb0" }, { "url": "https://www.didww.com/DIDWW-Terms-and-Agreements", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:49:31.750868001Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "2568f2c611f6" } ], "updatedAt": "2026-10-10T03:07:03.494188648Z" } }, "answer": "SignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics.", "b": { "slug": "signalwire-voice", "name": "SignalWire Voice API", "vendor": "SignalWire", "vendorUrl": "https://signalwire.com", "kind": "http-api", "category": "voice-calling", "summary": "Programmable calling API from the team behind FreeSWITCH.", "url": "https://www.anchorterminal.com/tools/signalwire-voice", "markdownUrl": "https://www.anchorterminal.com/tools/signalwire-voice.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/signalwire-voice.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/signalwire-voice.json", "repo": "https://github.com/signalwire/signalwire-python", "license": "MIT", "transports": [ "http" ], "packages": [ { "registry": "pypi", "name": "signalwire-sdk" }, { "registry": "npm", "name": "@signalwire/sdk" }, { "registry": "pypi", "name": "signalwire" } ], "auth": "api-key", "authNotes": "HTTP Basic auth with the Project ID and an API token, scoped per product (the Voice scope for calls). Each account has its own Space subdomain, so the host differs per customer. New tokens start with swapi_ since September 2026.", "pricing": "usage", "pricingNotes": "Pay as you go. New accounts start in trial mode without a card, and adding a card with at least $5 of credit lifts the restrictions. US local inbound $0.0066 and outbound $0.008 a minute, toll-free inbound $0.0147 and outbound $0.0069, SIP or WebRTC legs $0.003. Local numbers $0.50 a month, toll-free $0.80. Recording $0.002 a minute, live transcription $0.065 a minute per direction, and the AI agent runtime $0.16 a minute including STT, LLM and standard TTS (https://www.signalwire.com/pricing/voice).", "priceSummary": "$0.50 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402 or stablecoin payment path in the voice docs, pricing or llms.txt (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 8, "npmWeekly": 1531, "pypiWeekly": 1349, "asOf": "2026-09-30" }, "docsUrl": "https://signalwire.com/docs/platform/voice", "llmsTxt": "https://signalwire.com/docs/llms.txt", "openapi": "https://signalwire.com/docs/openapi.json", "capabilities": [ "voice.calls", "voice.numbers", "voice.streaming", "voice.sip", "voice.recording", "voice.transfer" ], "tags": [ "hosted", "llms-txt", "openapi", "typescript", "python", "webhooks", "streaming" ], "lastRelease": "2026-09-30", "graded": true, "anchor": { "graded": true, "score": 67.1, "grade": "B", "agentReady": false, "rank": 261, "ranked": true, "rankOf": 950, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 68, "maintenance": 81, "payments": 40, "reliability": 53, "schema": 87, "security": 72, "transparency": 76 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "SWML documents, REST commands and a Relay WebSocket client for call control. Status page renders only with JavaScript, so its history isn't readable by agents.", "bestFor": "Builders who want call logic in documents (SWML) or a hosted AI agent verb, and for teams moving off Twilio's API shape.", "strengths": [ "SWML documents, REST commands and a Relay WebSocket client for call control", "OpenAPI 3.1 spec and Markdown for every docs page", "SLA of 99.95 per cent monthly uptime on every account, plus ISO 27001, SOC 2 Type 2, a DPA and a disclosure policy", "Webhooks signed with HMAC in `x-signalwire-signature`, checked by the Python SDK on SWML and tool calls", "Six Python SDK releases between 25 August and 29 September 2026" ], "weaknesses": [ "Status page renders only with JavaScript, so its history isn't readable by agents", "No published rate-limit numbers beyond the trial's 10 queued calls", "No idempotency key, and the safe-retry rules live in the Python SDK rather than the API docs", "Per-customer Space hostnames, so there is no single public API host", "No security.txt or bug bounty" ], "agentNotes": [ "Send dial with a url pointing at a SWML document, then use calling.* commands on the returned call ID", "Don't retry a dial on a 5xx. Retry only on 429 or 503, after Retry-After, or you may place the call twice", "Use your own Space subdomain as the host, there is no shared API host", "Create a token with only the Voice scope for a calling agent", "Verify `x-signalwire-signature` with the Signing Key before acting on a webhook" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 67.1 } ], "editorialScores": { "ergonomics": 68, "maintenance": 81, "payments": 40, "reliability": 53, "schema": 87, "security": 72, "transparency": 65 }, "provenanceScore": 87 }, "connect": { "http": "curl -X POST \"https://$SIGNALWIRE_SPACE.signalwire.com/api/calling/calls\" -u \"$SIGNALWIRE_PROJECT_ID:$SIGNALWIRE_API_TOKEN\" \\\n -H \"Content-Type: application/json\" -d '{\"command\":\"dial\",\"params\":{\"from\":\"+15551234567\",\"to\":\"+15557654321\",\"url\":\"https://example.com/swml\"}}'" }, "letme": { "capability": "https://letme.dev/voice.calls", "tool": "https://letme.dev/signalwire-voice" }, "area": "voice", "unitPrices": [ { "item": "US outbound, local", "unit": "call-minute", "usd": 0.008, "note": "outbound to US local numbers" }, { "item": "US inbound, local number", "unit": "call-minute", "usd": 0.0066, "note": "inbound on a US local number" }, { "item": "US outbound, toll-free", "unit": "call-minute", "usd": 0.0069, "note": "outbound to US toll-free numbers" }, { "item": "US inbound, toll-free number", "unit": "call-minute", "usd": 0.0147, "note": "inbound on a US toll-free number" }, { "item": "SIP or WebRTC leg", "unit": "call-minute", "usd": 0.003, "note": "inbound or outbound" }, { "item": "AI agent runtime", "unit": "call-minute", "usd": 0.16, "note": "platform fee on top of call minutes, includes STT, LLM and standard TTS" }, { "item": "US local number", "unit": "month", "usd": 0.5, "note": "per number" }, { "item": "US toll-free number", "unit": "month", "usd": 0.8, "note": "per number" } ], "provenance": { "legalEntity": "SignalWire, Inc.", "domain": "signalwire.com", "domainRegistered": "2016-01-21", "endpointOnVendorDomain": true, "terms": "https://info.signalwire.com/hubfs/PDFs/SignalWire-Cloud-Agreement.pdf", "privacy": "https://m.signalwire.com/policies?doc=privacy", "statusPage": "https://status.signalwire.com", "changelog": "https://signalwire.com/docs/platform/changelog", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "Legal entity from signalwire.com/legal. The status page redirects to a PagerDuty-hosted page.", "remoteUrl left empty because each account calls its own Space subdomain (\u003cspace\u003e.signalwire.com/api/calling/calls)." ], "score": 87 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/signalwire-voice.json", "live": { "slug": "signalwire-voice", "vendorStatus": { "page": "https://status.signalwire.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:51:15.872250088Z" }, "versions": [ { "registry": "github", "name": "signalwire/signalwire-python", "version": "v3.6.0", "released": "2026-10-05", "seenAt": "2026-10-09T17:20:11.489094672Z" }, { "registry": "npm", "name": "@signalwire/sdk", "version": "3.6.0", "seenAt": "2026-10-09T17:20:09.594617472Z" }, { "registry": "pypi", "name": "signalwire", "version": "2.1.1", "released": "2025-02-04", "seenAt": "2026-10-09T17:20:10.503546014Z" }, { "registry": "pypi", "name": "signalwire-sdk", "version": "3.6.0", "released": "2026-10-05", "seenAt": "2026-10-09T17:20:09.481826567Z" } ], "githubStars": 8, "npmWeekly": 2761, "pypiWeekly": 826, "securityTxt": { "url": "https://signalwire.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:39:42.364663654Z" }, "llmsTxt": { "url": "https://signalwire.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-09T14:02:46.905109667Z" }, "domain": { "domain": "signalwire.com", "registered": "2016-01-21", "source": "https://rdap.verisign.com/com/v1/domain/signalwire.com", "checkedAt": "2026-10-04T13:04:21.502174122Z" }, "pages": [ { "url": "https://signalwire.com/docs/platform/changelog", "kind": "deprecations", "status": 304, "checkedAt": "2026-10-09T18:45:25.607119094Z", "changedAt": "2026-10-07T18:09:23.01711151Z", "fingerprint": "41a8ac7eb288" }, { "url": "https://www.signalwire.com/pricing/voice", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:54:11.61751575Z", "changedAt": "2026-10-03T15:40:04.301482046Z", "fingerprint": "40b5008528b4" }, { "url": "https://m.signalwire.com/policies?doc=privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:41:38.302760589Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" } ], "updatedAt": "2026-10-10T00:51:15.872250088Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "DIDWW Ireland Limited", "b": "SignalWire", "name": "Vendor" }, { "a": "https://api.didww.com/mcp", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Pay per use", "name": "Pricing" }, { "a": "not published", "b": "$0.0066 per minute of call", "name": "Price for phone numbers" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT", "b": "MIT", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-07", "b": "2026-09-30", "name": "Last release" }, { "a": "no date given", "b": "", "name": "Terms last updated" }, { "a": "no date given", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "", "name": "Arbitration or class-action waiver" }, { "a": "10 stars, 462 npm/wk", "b": "8 stars, 1.5k npm/wk, 1.3k PyPI/wk", "name": "Popularity" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "SignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics.", "question": "Which is better for AI agents, DIDWW Voice and Number Management API or SignalWire Voice API?" }, { "answer": "Both need an API key.", "question": "Do DIDWW Voice and Number Management API and SignalWire Voice API need an API key?" }, { "answer": "DIDWW Voice and Number Management API has a hosted endpoint at https://api.didww.com/mcp. No hosted endpoint is listed for SignalWire Voice API.", "question": "Can an agent call DIDWW Voice and Number Management API and SignalWire Voice API without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 66 against 53", "Agent ergonomics, 77 against 68" ], "also": [ "A hosted endpoint, with nothing to install" ], "goodFor": "Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API.", "slug": "didww-voice-and-number-management", "watchFor": "No per-number or per-minute price is published. Price lists are sent on request or shown inside an account, and a $30 balance is needed before ordering" }, { "aheadOn": [ "Security \u0026 auth, 72 against 57", "Payments \u0026 pricing, 40 against 15", "Transparency \u0026 trust, 76 against 70" ], "also": null, "goodFor": "Builders who want call logic in documents (SWML) or a hosted AI agent verb, and for teams moving off Twilio's API shape.", "slug": "signalwire-voice", "watchFor": "Status page renders only with JavaScript, so its history isn't readable by agents" } ], "job": { "capability": "voice.numbers", "name": "Phone numbers" }, "others": [ { "json": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-signalwire-voice.json", "title": "Bandwidth Voice API + MCP vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/exotel-voice-vs-signalwire-voice.json", "title": "Exotel Voice API + MCP vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/exotel-voice-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/infobip-calls-vs-signalwire-voice.json", "title": "Infobip Calls API + MCP vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/infobip-calls-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/jambonz-vs-signalwire-voice.json", "title": "jambonz vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/jambonz-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/livekit-telephony-vs-signalwire-voice.json", "title": "LiveKit Telephony vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/livekit-telephony-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/plivo-voice-vs-signalwire-voice.json", "title": "Plivo Voice API vs SignalWire Voice API", "url": "https://www.anchorterminal.com/compare/plivo-voice-vs-signalwire-voice" }, { "json": "https://www.anchorterminal.com/compare/signalwire-voice-vs-sinch-voice.json", "title": "SignalWire Voice API vs Sinch Voice API + MCP", "url": "https://www.anchorterminal.com/compare/signalwire-voice-vs-sinch-voice" }, { "json": "https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice.json", "title": "SignalWire Voice API vs Telnyx Voice API + MCP", "url": "https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice" }, { "json": "https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.json", "title": "SignalWire Voice API vs Twilio Programmable Voice API + MCP", "url": "https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice" }, { "json": "https://www.anchorterminal.com/compare/signalwire-voice-vs-vonage-voice.json", "title": "SignalWire Voice API vs Vonage Voice API + MCP", "url": "https://www.anchorterminal.com/compare/signalwire-voice-vs-vonage-voice" }, { "json": "https://www.anchorterminal.com/compare/signalwire-voice-vs-voximplant.json", "title": "SignalWire Voice API vs Voximplant", "url": "https://www.anchorterminal.com/compare/signalwire-voice-vs-voximplant" }, { "json": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-didww-voice-and-number-management.json", "title": "Bandwidth Voice API + MCP vs DIDWW Voice and Number Management API", "url": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-didww-voice-and-number-management" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-exotel-voice.json", "title": "DIDWW Voice and Number Management API vs Exotel Voice API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-exotel-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-infobip-calls.json", "title": "DIDWW Voice and Number Management API vs Infobip Calls API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-infobip-calls" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-livekit-telephony.json", "title": "DIDWW Voice and Number Management API vs LiveKit Telephony", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-livekit-telephony" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-plivo-voice.json", "title": "DIDWW Voice and Number Management API vs Plivo Voice API", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-plivo-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-sinch-voice.json", "title": "DIDWW Voice and Number Management API vs Sinch Voice API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-sinch-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-telnyx-voice.json", "title": "DIDWW Voice and Number Management API vs Telnyx Voice API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-telnyx-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-twilio-voice.json", "title": "DIDWW Voice and Number Management API vs Twilio Programmable Voice API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-twilio-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-vonage-voice.json", "title": "DIDWW Voice and Number Management API vs Vonage Voice API + MCP", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-vonage-voice" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-voximplant.json", "title": "DIDWW Voice and Number Management API vs Voximplant", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-voximplant" }, { "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.json", "title": "DIDWW Voice and Number Management API vs jambonz", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz" } ], "scores": [ { "by": 13, "didww-voice-and-number-management": 66, "edge": "didww-voice-and-number-management", "key": "reliability", "name": "Reliability", "signalwire-voice": 53, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 0, "didww-voice-and-number-management": 87, "edge": "", "key": "schema", "name": "Schema \u0026 documentation", "signalwire-voice": 87, "weight": 13 }, { "by": 9, "didww-voice-and-number-management": 77, "edge": "didww-voice-and-number-management", "key": "ergonomics", "name": "Agent ergonomics", "signalwire-voice": 68, "weight": 13 }, { "by": 15, "didww-voice-and-number-management": 57, "edge": "signalwire-voice", "key": "security", "name": "Security \u0026 auth", "signalwire-voice": 72, "weight": 14 }, { "by": 25, "didww-voice-and-number-management": 15, "edge": "signalwire-voice", "key": "payments", "name": "Payments \u0026 pricing", "signalwire-voice": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 2, "didww-voice-and-number-management": 83, "edge": "didww-voice-and-number-management", "key": "maintenance", "name": "Maintenance \u0026 community", "signalwire-voice": 81, "weight": 7 }, { "by": 6, "didww-voice-and-number-management": 70, "edge": "signalwire-voice", "key": "transparency", "name": "Transparency \u0026 trust", "signalwire-voice": 76, "weight": 7 } ], "summary": "SignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics. Both do phone numbers.", "verdicts": { "didww-voice-and-number-management": "An OpenAPI 3.0.3 document with 107 operations, Markdown docs, a free sandbox and SDKs in seven languages cover number ordering and SIP trunk set-up. No per-number or per-minute price is public, API keys carry no scopes, orders have no idempotency key, and outbound calling needs an approved application. Calls travel over SIP only.", "signalwire-voice": "SWML documents, REST commands and a Relay WebSocket client for call control. Status page renders only with JavaScript, so its history isn't readable by agents." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice", "json": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.md", "slim": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.min.md" }, "markdown": "SignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics. Both do phone numbers.\n\n- DIDWW Voice and Number Management API: grade B, 65.1/100, rank #330 of 950. Markdown https://www.anchorterminal.com/tools/didww-voice-and-number-management.md · JSON https://www.anchorterminal.com/api/v1/tools/didww-voice-and-number-management.json\n- SignalWire Voice API: grade B, 67.1/100, rank #261 of 950. Markdown https://www.anchorterminal.com/tools/signalwire-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/signalwire-voice.json\n- Best phone calling and voice transport APIs for AI agents: https://www.anchorterminal.com/best/voice-calling/index.md\n- All 78 calling comparisons: https://www.anchorterminal.com/compare/voice-calling/index.md\n\n## Which one, for what\n\n### DIDWW Voice and Number Management API (B)\n\nGood for: Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API.\n\nAhead on:\n- Reliability, 66 against 53\n- Agent ergonomics, 77 against 68\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n\nWatch for: No per-number or per-minute price is published. Price lists are sent on request or shown inside an account, and a $30 balance is needed before ordering\n\n### SignalWire Voice API (B)\n\nGood for: Builders who want call logic in documents (SWML) or a hosted AI agent verb, and for teams moving off Twilio's API shape.\n\nAhead on:\n- Security \u0026 auth, 72 against 57\n- Payments \u0026 pricing, 40 against 15\n- Transparency \u0026 trust, 76 against 70\n\nWatch for: Status page renders only with JavaScript, so its history isn't readable by agents\n\n\n## Score by category\n\n| Category | Weight | DIDWW Voice and Number Management API | SignalWire Voice API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 66 | 53 | DIDWW Voice and Number Management API +13 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 87 | 87 | even |\n| Agent ergonomics | 13% (16.2 this run) | 77 | 68 | DIDWW Voice and Number Management API +9 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 72 | SignalWire Voice API +15 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 15 | 40 | SignalWire Voice API +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 83 | 81 | DIDWW Voice and Number Management API +2 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 76 | SignalWire Voice API +6 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **65.1 · B** | **67.1 · B** | |\n\n## Facts side by side\n\n| Fact | DIDWW Voice and Number Management API | SignalWire Voice API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | DIDWW Ireland Limited | SignalWire |\n| Hosted endpoint | `https://api.didww.com/mcp` | no (local only) |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| Price for phone numbers | not published | $0.0066 per minute of call |\n| x402 | no | no |\n| Licence | Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT | MIT |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-07 | 2026-09-30 |\n| Terms last updated | no date given | |\n| Privacy policy last updated | no date given | couldn't be read |\n| Customer content may train models | not found in the text | |\n| Terms restrict automated access | not found in the text | |\n| Terms restrict benchmarking | not found in the text | |\n| Terms or service can change without notice | not found in the text | |\n| Arbitration or class-action waiver | not found in the text | |\n| Popularity | 10 stars, 462 npm/wk | 8 stars, 1.5k npm/wk, 1.3k PyPI/wk |\n| Agent reviews | none | 3.5/5 (2) |\n\n## Verdicts\n\n**DIDWW Voice and Number Management API.** An OpenAPI 3.0.3 document with 107 operations, Markdown docs, a free sandbox and SDKs in seven languages cover number ordering and SIP trunk set-up. No per-number or per-minute price is public, API keys carry no scopes, orders have no idempotency key, and outbound calling needs an approved application. Calls travel over SIP only.\n\n**SignalWire Voice API.** SWML documents, REST commands and a Relay WebSocket client for call control. Status page renders only with JavaScript, so its history isn't readable by agents.\n\n## Before you call either\n\n### DIDWW Voice and Number Management API\n\n1. Send `Api-Key: \u003ckey\u003e` with no `Bearer` prefix, plus `Accept: application/vnd.api+json`, and `Content-Type: application/vnd.api+json` on every request with a body\n2. Set `X-DIDWW-API-Version: 2026-04-16` on each request and read `meta.api_version` in the reply. A header older than the account's version is ignored\n3. Before retrying a timed-out `POST /orders`, list `GET /orders` first. The order is charged to the balance at once and no idempotency key exists\n4. Stay under 20 requests a second per key. On `429` wait before retrying, since no `Retry-After` header is documented\n5. Use `fields[...]`, `filter[...]`, `include` and `page[size]` (default 50, maximum 100) to keep JSON:API replies small\n6. Check `GET /address_requirements` before buying a number. Many countries need a verified identity and address, and the sandbox cannot run identity verification\n7. Create and enable a callback secret in the User Panel before relying on callbacks. Without one nothing is sent, and receivers must verify `X-DIDWW-Signature`\n\n### SignalWire Voice API\n\n1. Send dial with a url pointing at a SWML document, then use calling.* commands on the returned call ID\n2. Don't retry a dial on a 5xx. Retry only on 429 or 503, after Retry-After, or you may place the call twice\n3. Use your own Space subdomain as the host, there is no shared API host\n4. Create a token with only the Voice scope for a calling agent\n5. Verify `x-signalwire-signature` with the Signing Key before acting on a webhook\n\n## Questions\n\n### Which is better for AI agents, DIDWW Voice and Number Management API or SignalWire Voice API?\n\nSignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics.\n\n### Do DIDWW Voice and Number Management API and SignalWire Voice API need an API key?\n\nBoth need an API key.\n\n### Can an agent call DIDWW Voice and Number Management API and SignalWire Voice API without installing anything?\n\nDIDWW Voice and Number Management API has a hosted endpoint at https://api.didww.com/mcp. No hosted endpoint is listed for SignalWire Voice API.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.json, and with the fewest tokens: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"didww-voice-and-number-management\", \"b\": \"signalwire-voice\"}`. From a terminal: `anchor compare didww-voice-and-number-management signalwire-voice`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/didww-voice-and-number-management.json and https://www.anchorterminal.com/api/v1/tools/signalwire-voice.json\n\n## Other comparisons with DIDWW Voice and Number Management API or SignalWire Voice API\n\n- [Bandwidth Voice API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-signalwire-voice.md)\n- [Exotel Voice API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/exotel-voice-vs-signalwire-voice.md)\n- [Infobip Calls API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/infobip-calls-vs-signalwire-voice.md)\n- [jambonz vs SignalWire Voice API](https://www.anchorterminal.com/compare/jambonz-vs-signalwire-voice.md)\n- [LiveKit Telephony vs SignalWire Voice API](https://www.anchorterminal.com/compare/livekit-telephony-vs-signalwire-voice.md)\n- [Plivo Voice API vs SignalWire Voice API](https://www.anchorterminal.com/compare/plivo-voice-vs-signalwire-voice.md)\n- [SignalWire Voice API vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-sinch-voice.md)\n- [SignalWire Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice.md)\n- [SignalWire Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.md)\n- [SignalWire Voice API vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-vonage-voice.md)\n- [SignalWire Voice API vs Voximplant](https://www.anchorterminal.com/compare/signalwire-voice-vs-voximplant.md)\n- [Bandwidth Voice API + MCP vs DIDWW Voice and Number Management API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-didww-voice-and-number-management.md)\n- [DIDWW Voice and Number Management API vs Exotel Voice API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-exotel-voice.md)\n- [DIDWW Voice and Number Management API vs Infobip Calls API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-infobip-calls.md)\n- [DIDWW Voice and Number Management API vs LiveKit Telephony](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-livekit-telephony.md)\n- [DIDWW Voice and Number Management API vs Plivo Voice API](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-plivo-voice.md)\n- [DIDWW Voice and Number Management API vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-sinch-voice.md)\n- [DIDWW Voice and Number Management API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-telnyx-voice.md)\n- [DIDWW Voice and Number Management API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-twilio-voice.md)\n- [DIDWW Voice and Number Management API vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-vonage-voice.md)\n- [DIDWW Voice and Number Management API vs Voximplant](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-voximplant.md)\n- [DIDWW Voice and Number Management API vs jambonz](https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-jambonz.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "DIDWW Voice and Number Management API vs SignalWire Voice API", "url": "" } ], "description": "SignalWire Voice scores 67.1 (B) to DIDWW Voice and Number Management's 65.1 (B) for phone numbers. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "DIDWW Voice and Number Management API B 65.1", "SignalWire Voice API B 67.1", "scores" ], "h1": "DIDWW Voice and Number Management API vs SignalWire Voice API", "image": "https://www.anchorterminal.com/assets/og/compare-didww-voice-and-number-management-vs-signalwire-voice.png", "path": "/compare/didww-voice-and-number-management-vs-signalwire-voice", "published": "2026-10-01", "section": "tools", "title": "DIDWW Voice and Number Management vs SignalWire Voice (2026)", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice" }, "tokens": { "markdown": 2900, "slim": 780 }, "version": 1 }