Feature

Request Signing

HMAC or cryptographically signed requests.

24 providers 140 APIs 24 declared variants

Callers sign requests with a shared secret or private key so the provider can verify integrity and origin. Common on payments, trading, and webhook-verification surfaces.

24 API providers on the APIs.io network offer request signing. The highest-rated are fal, Ashby, Fintecture, dLocal, Replicate.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 2 Complete, well-documented, and agent-ready
fal fal (Features and Labels, Inc.) is a generative media platform providing the world's fastest API for runnin... 9 APIs 70.8 Ashby Ashby is a modern all-in-one recruiting platform combining Applicant Tracking System (ATS), sourcing/CRM, i... 15 APIs 70.1
Strong 8 Solid coverage with minor gaps
Fintecture Fintecture is a French Open Banking payments platform and ACPR-authorised payment institution (#17248). Its... 8 APIs 67.3 dLocal dLocal (NASDAQ: DLO) is a Uruguay-headquartered emerging-markets payment infrastructure platform connecting... 9 APIs 66.4 Replicate Replicate lets you run machine learning models in the cloud with a simple API. Thousands of open-source mod... 1 API 64.8 Allegion Allegion plc is a global security products company with $3.8B in 2024 revenue, 13,000+ employees, and 30+ b... 2 APIs 64.2 Onfleet Onfleet is an AI-powered last-mile delivery management platform that orchestrates fleet operations, dispatc... 8 APIs 64.0 fireblocks Fireblocks is an institutional digital-asset and stablecoin infrastructure company providing MPC-secured cu... 15 APIs 63.9 AWS Braket Amazon Braket is AWS's fully managed quantum computing service. It provides a unified API and SDK for explo... 5 APIs 62.6 Greenhouse Greenhouse Software is an enterprise applicant tracking system (ATS) and end-to-end hiring platform spannin... 8 APIs 61.8
Developing 6 Usable, with meaningful gaps to close
Bridge Bridge (Bridge Interactive / Bridge Data Output) is a Zillow Group company that runs the Bridge Platform — ... 4 APIs 58.6 Kushki Kushki is an Ecuador-headquartered LatAm fintech operating as a regional non-banking acquirer for the Andea... 8 APIs 58.6 MetaMap MetaMap (formerly Mati) is an identity verification platform founded in 2017 in San Francisco and headquart... 1 API 58.0 TrackingMore TrackingMore is a multi-carrier shipment tracking platform offering a unified REST API that integrates with... 1 API 55.0 Conekta Conekta is a Mexico-based payment processor that lets businesses accept credit and debit cards, OXXO cash v... 1 API 54.4 LBank LBank is a global cryptocurrency exchange providing REST and WebSocket APIs for spot trading, ETF/leveraged... 5 APIs 54.1
Thin 6 Limited public surface area
RocketReach RocketReach is a Seattle-based B2B contact data and sales intelligence provider that maintains a database o... 5 APIs 43.4 Linear Linear is an issue tracking and product development platform for software teams covering Intake, Plan, Buil... 4 APIs 40.7 OPay OPay is a Nigerian mobile money and fintech super-app operated by Blue Ridge Microfinance Bank (OPay Digita... 1 API 39.1 Riskified Riskified (NYSE RSKD) is an Israeli ecommerce risk-management platform that uses machine learning and a glo... 7 APIs 34.0 Moovit Moovit is a Tel Aviv-founded urban mobility company acquired by Intel in May 2020 for approximately $900M a... 1 API 31.6 Fawry Fawry is Cairo-based Egypt's leading provider of e-payments and digital finance solutions, operating a nati... 1 API 30.2
Emerging 2 Early or largely undocumented
Pagar.me Pagar.me is the API-first online payments platform from Stone Co., one of Brazil's largest financial techno... 17 APIs 27.6 Certn Certn is a Canadian background screening platform headquartered in Victoria, British Columbia, providing fa... 4 APIs 26.9

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

22 outbound webhook event types — HMAC-SHA256 signed via Ashby-Signature header — with automatic retries and related-webhook ordering guaranteesAWS SigV4 authentication and full IAM integration including ABAC via resource tagsAsynchronous lookup results delivered via webhooks with signed payloads and RR-Request-ID correlationFiles input via signed URLsHMAC-SHA256 authentication (X-RISKIFIED-HMAC-SHA256 + X-RISKIFIED-SHOP-DOMAIN headers) with versioned Accept headerHMAC-SHA256 authentication with API_KEY and nonce/timestamp signingHMAC-SHA256 signed webhooks via Linear-Signature headerHMAC-SHA256 webhook signing via /webhooks/secret with X-Onfleet-Signature headerHMAC-SHA512 Signature AuthenticationOutbound webhooks with HMAC-SHA256 signed payloads (`Certn-Signature`) and replay protectionPayments API authenticated with V2-HMAC-SHA256 signature (X-Login, X-Trans-Key, X-Date)RSA and HMAC AuthenticationRecruiting Webhooks with HMAC SHA-256 signature verificationSHA-256 request signing using per-merchant secureKeyVerification media (documents, photos, videos) retrieval via signed URLsWebhook callbacks for queue completion with HMAC signature verificationWebhook events via POST with HMAC-SHA256 signature verificationWebhook events with signature verification and an in-console Event SimulatorWebhook notifications with signed payloads, retry policy, and exponential backoffWebhook signature verification via public keyWebhooks API for real-time listing change events with PKI-signed payloads and exponential-backoff retriesWebhooks V2 with replay-from-history and RSA-SHA512 signature verificationWebhooks for asynchronous order, charge, subscription, and payout events with signature verification and configurable retriesWebhooks with signature verification

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